Technical Description of TANDBERG 2500 with software version E3/B8

Transcription

1 Technical Description of TANDBERG 2500 with software version E3/B8 TANDBERG D12161 Rev.09

2 Table of contents 1. INTRODUCTION PRODUCT DESCRIPTION CODEC Software Versions WIDE ANGLE VIEW (W.A.V.E) CAMERA Camera Features Camera Pinouts and connectors Multiple Camera Control Camera Tracking Calculation of Horizontal Viewing Area Camera Control Interface REMOTE CONTROL Transmission Protocol Key Pad Layout and Codes MONITOR(S) CABINET OPERATION AND USER INTERFACE CODEC INTERFACES NETWORK INTERFACES AND FEATURES BRI ISDN Interface ISDN Subaddress & MSN NET Interface Ethernet / LAN Interface (H.323) Default IP Password Quality of Service features (QoS) Automatic selection of H.323 or H.320 outgoing calls IP adaptive bandwidth management Gatekeeper authentication Registration to Call Manager Configuring an H.323 client on the CallManager H.323 ID Dynamic playout buffering Asymmetrical media capabilities Diagnostic tools for IP NAT support Latency & Jitter Layer 4 Ports used in H.323 calls IP packet sizes Intelligent Packet Loss Recovery (IPLR) IP Conflict Warning Streaming Automatic announcement of Streaming Intelligent Call Management (ICM) Network Profiles Encryption AGGREGATION STANDARDS BONDING H Encoding delay DATA INTERFACE/APPLICATION PROGRAMMABLE INTERFACE (API) Data Protocols Translation in RS232 cable for TANDBERG 2500 dual monitor (OPTIONAL) VIDEO INTERFACES AND VIDEO FEATURES Video Inputs XGA Input ( PC Presenter ) VGA, SVGA and XGA Pin layout PC Soft Presenter (Optional) Video Outputs XGA Output Optimized Video Compression D12161 Rev.09 2

3 4.4.7 Intelligent Video Management (IVM) IVM Resolution Duo Video (Optional) Single Monitor Duo Video (Optional) Digital Clarity (Optional) Natural Video (icif/isif) Native Resolutions One-touch Snapshot Screen Saver AUDIO INTERFACES AND AUDIO FEATURES Audio Inputs Specification microphone Inputs Specification audio line Inputs Specification standard microphone (AT871R) Audio Outputs Specification Audio line Outputs Flexible Audio Features Acoustic Echo Cancellers Adjusting the Acoustic Echo Cancellers Noise Reduction (NR) Audio levelling/ Automatic Gain Control (AGC) VCR Audio Features Telephony Analogue Telephone add-on (US option only) Microphone Off Audio Compression Algorithms SYSTEM MANAGEMENT LAN Interface Set-up Platform Requirements Protocols Supported System Management Functionality Remote software upgrades using FTP: Remote software upgrades during a call Management using a standard Web-browser: Management using a standard Telnet-client: Management using a terminal connected to the RS232 port: Remote Management using SNMP: Security Disable Services Security Alert System Protection System Access (/Account) codes: Menu Password: Authentication of Remote Management System Layer 4 ports used by the system WEB SNAPSHOTS TANDBERG MULTISITE (OPTIONAL) MultiSite Cascading MISCELLANEOUS FEATURES MULTI-LANGUAGE OPTIONS DIRECTORY MultiSite Entries BOOT UP LOGO STARTUP SCRIPTS LOOPBACK TESTING FOR REMOTE DIAGNOSTICS MAXIMUM CALL LENGTH CLOSES CAPTIONING/TEXT CHAT OTHER STANDARDS SUPPORTED H H H.331 (Broadcast mode) H.231/H.243 (MCU control) H.243 Password H.281 (FECC) KG-194/KIV-7 (NATO encryption) D12161 Rev.09 3

4 6. ENVIRONMENTAL ISSUES TANDBERG S ENVIRONMENTAL POLICY ENVIRONMENTAL CONSIDERATIONS PRODUCT APPROVALS CONNECTION OF TELE-TERMINAL EQUIPMENT EMC EMISSION - RADIATED ELECTROMAGNETIC INTERFERENCE EMC IMMUNITY ELECTRICAL SAFETY PRODUCT RELIABILITY TECHNICAL SPECIFICATION OF TANDBERG MECHANICAL INFORMATION PACKAGING THE TANDBERG 2500 PORTABLE VERSION OPERATING TEMPERATURE AND HUMIDITY STORAGE AND TRANSPORT TEMPERATURE SYSTEM POWER CONSUMPTION TECHNICAL SPECIFICATION SHEET D12161 Rev.09 4

5 1. Introduction The TANDBERG 2500 videoconferencing system is designed for use with data rates from 56 kbps up to 384 kbps, using ITU-T standard H.320 for video compression and a combination of H.221 and BONDING for communication up to 6 ISDN B-channels. The system also supports calls up to 1536 kbps when connected to a LAN, using the ITU-T H.323 standard. All features of the TANDBERG 2500 are based on standards set by the ITU-T. When directly connected to BRI ISDN network, TANDBERG's SoftMux enables BONDING calls up to 384 kbps. When directly connected to special data networks, TANDBERG's network manager enables calls up to 384 kbps. When directly connected to a Local Area Network, TANDBERG's network manager enables automatic detection of speeds up to 1536 kbps. If the system is connected to both ISDN and LAN, the TANDBERG 2500 can handle both ISDN sites and IP sites in the same call. The TANDBERG 2500 videoconferencing system consists of a Codec (COding / DECoding unit), combined with a PAL or NTSC monitor, a remote controllable PAL or NTSC camera, a hand held remote control unit and a tabletop microphone. The TANDBERG 2500 can be installed as a single or a dual monitor system. The Codec is installed inside the Cabinet. D12161 Rev.09 5

6 2. Product Description 2.1 Codec The Codec is the "brain" of the system and handles all incoming and outgoing video, audio and data towards the switched public telephone networks, Local Area Networks (LAN) or external networks. The Codec receives pictures from a video source e.g. the TANDBERG Camera, encodes and compresses the live video and audio at rates of up to 30 frames per second (60 fields per second). The coded image and audio is transmitted to a remote unit at rates up to 1536 kbps (IP network) or 384 kbps (ISDN/External network). The Codec also receives incoming video and audio at rates up to 384 kbps/ 1536 kbps, decodes the live video and audio and passes the video signal to the monitor for display. Audio is decoded and passed to the amplifier/speaker of the main TV-monitor Software Versions There are two software versions available for TANDBERG PAL or NTSC. Each version allows for calls up to 1536 kbps (IP network) or 384 kbps (ISDN/External network). For each software version, there are six software options with special features included: Software Option Features 1 Standard Receive Digital Clarity (4xCIF/4xSIF/VGA/SVGA/XGA 1 ) 2 Natural Presenter Package (NPP) Duo Video Transmit & Receive Digital Clarity (4xCIF/4xSIF/VGA/SVGA/XGA 1 ) PC Soft Presenter 3 MultiSite (MS) NPP Internal MCU Audio Bridge 1 XGA only supported from software E1 onward. D12161 Rev.09 6

7 2.2 Wide Angle View (W.A.V.E) Camera The TANDBERG 2500 is equipped with the W.A.V.E. Camera, which is controlled by the remote control. This allows the user to zoom, focus, pan and tilt the camera. The camera is either PAL or NTSC depending on the country of use. The power on the codec must be switched off whenever connecting/disconnecting a camera to/from the codec or a daisy chain 2. Only cameras with software revision TT0a or later support camera tracking and daisy chaining Camera Features Camera Specifications 1/3 CCD Colour Camera (single chip) PAL or NTSC 190 Pan+77 Horizontal Field of View 10 x Zoom (optical) 35 Tilt +61 Vertical Field of View 15 Camera Pre-sets Auto/Manual Focus/Brightness/White Balance Min. illumination 2,0 Lux (F1.8 wide) Max camera cable length supported 10m (32,8 ft) Focal length f=4,2 mm to 42 mm Power reqmnts DC 12 V, min. 1Amps ±5% Aperture F=1,8 to 2,7 (wide to tele) Max. focus response time 0.5sec ( to near) Zoom speed wide to tele 1,8sec The system is able to store up to 15 pre-set camera positions, making it easier for the user to change the selected view rapidly during a presentation or a meeting. If the main camera is selected, pan, tilt, zoom and focus will also be stored with the preset. The first 10 presets may be accessed via the remote control, while the 5 remaining presets are accessed by data port commands or IR-codes (e.g. by using the TANDBERG Tracker 3 ). The camera is equipped with a wide angle lens and covers a wide area as shown below: The camera covers a horizontal field of view of 77, while panning takes the range up close to field of view Camera seen from above 77 field of view Minimum horizontal field of view (maximum zoom in) is 7.7. The camera covers a vertical field of view of 61, while tilting takes the range up to 96. Tilting the camera max. 15 upward and max. 20 downward. 2 See chapter for Multiple W.A.V.E. camera support 3 Information of the TANDBERG Tracker is found in the User Manual. 4 Maximum wide angle for all camera measurements. D12161 Rev.09 7

8 Automatic or manual brightness, focus and white balance ensures that the user obtains the best possible picture. Horizontal resolution: 450 TV lines for PAL and 460 TV lines for NTSC. Number of picture elements: 752 (h) x 582 (v) for PAL and 768 (h) x 494 (v) for NTSC. Shortest Subject Distance: 10 mm (wide end) and 1000 mm (tele end) At the codec s side, the camera cable splits in two: One presents the S-video Output (for connection to codec s Video Input1) while the other 9-PIN D-sub connector is power (12V) and control signals for moving the camera. The maximum length of the camera cable for main camera supported by TANDBERG is 10m (33 ft)- may be extended up to 20 m (66 ft) when using cable with external power supply Camera Pinouts and connectors 8-PIN RJ (shielded modular jack): This connector is used for the power and control signals to the main camera. pin V (presence when connected in daisy chain) pin-7 GND pin-6 GND pin-5 RXD (in) pin-4 TXD (out) pin-3 +12V pin-2 GND pin-1 +12V Standard Phono: Used for composite video signal Power: 2.0 mm DC power jack (+12V, 1A required) Standard Mini Din: Used for S-Video signal 6-PIN RJ (modular jack): This connector is used when cascading cameras: Control (out) signal and external camera detection. Note: It does not provide power for cascaded camera. Pin 6 Pin 5 Pin 4 Pin 3 Pin 2 Pin 1 GND GND RXD (in) TXD (out) Presence (+12V in daisy chain) GND D12161 Rev.09 8

9 2.2.3 Multiple Camera Control The TANDBERG 2500 is able to control up to four W.A.V.E. cameras from the remote control. The Main Camera must be connected to data port 2 on the Codec. The other cameras must be daisy-chained to the Main Camera. The Codec will provide power for the Main Camera only. The other cameras each need a separate power supply. The Main Camera must be connected to Video Input 1; the second camera must be connected to Video Input 2 and so on. The codec will automatically detect the number of cameras and the camera ID can be read in the System self test menu. The maximum length of the camera cable for multiple cameras supported by TANDBERG is 20 m (65 ft). The figure below is an example of how multiple cameras should be connected: Camera Tracking Voice-activated camera tracking with noise suppression and preset-combination has been implemented in the TANDBERG 2500 software. A W.A.V.E. Camera connected to Video Input 1 can be used for camera tracking 5. Two microphones must be installed and each microphone must be associated with a camera-preset position (preset P7 to Mic1 and P8 to Mic2). Camera tracking is temporarily turned off when another video source is selected (e.g. a document camera) or when the camera is manually adjusted. 5 If more than one W.A.V.E. camera is connected to the system, the presets may also be put on these cameras. D12161 Rev.09 9

10 2.2.5 Calculation of Horizontal Viewing Area The W.A.V.E. Camera s viewing area is maximized when the camera is zoomed fully out and minimized when the camera is zoomed fully in. To calculate the viewing area, the following measurements need to be taken: Camera Horizontal Viewing Area B Distance A The maximum viewing area for the W.A.V.E. camera, with the camera zoomed fully out is calculated by the formula: (Distance) A x 1.6 = (Max. viewing width) B max E.g. If A is 5 meters then the width of the viewing area B will be 5 x 1.6 = 8.0 meters The minimum viewing area for the W.A.V.E. camera, with the camera zoomed fully in is calculated by the formula: (Distance) A x 0.13 = (Min. viewing width) B min E.g. If A is 5 meters then the width of the viewing area B will be 5 x 0.13 = 0.65 meters Camera Control Interface The control cable for the camera must be connected to Data port 2. When the Codec is powered up, Data port 2 will automatically detect if a camera is attached to it. The TANDBERG 2500 supports two different camera protocols, the TANDBERG camera protocol and the VISCA protocol. To control the W.A.V.E. Camera, the following parameters are required on Data port 2: 9600 Baud 8 data bits 1 stop bit No parity Auto or VISCA TANDBERG 2500 also supports: Cameras such as Sony EVI D30/31 using the Sony VISCA protocol. The camera type in use will be automatically detected in the system boot-sequence except cameras using the VISCA protocol, where this option must be selected in the data port menu. D12161 Rev.09 10

11 2.3 Remote Control Technical Description of TANDBERG 2500 with software version E3/B Transmission Protocol The Infra Red (IR) sensor for the remote control is located in front of the W.A.V.E. Camera, just below the front glass. There is also a second IR-sensor located in the front of the Codec itself, which will be automatically enabled if the W.A.V.E. Camera is not connected to Data port 2. The TANDBERG handheld remote control transmits IRsignals using the following parameters: Protocol Siemens SDA2208 Reference Freq. 485 khz Address 4 & 7 IR wavelength 940 nm IR carrier Freq. 30 khz P1 main cam vcr far end + - menu delete 1 ghi 4 pqrs 7 P2 aux pc move pip mic off OK presets P abc 2 jkl 5 tuv 8 P3 doc cam snapshot selfview zoom connect directory disconnect store def 3 mno 6 wxyz Key Pad Layout and Codes The hand held remote control transmits 46 different codes. The keypad will not transmit additional codes if more than one key is pressed simultaneously. * 0 # The following table shows relationship between the remote s buttons and their respective codes. BUTTON CODES REMOTE BUTTON CODES REMOTE Address Decimal Hex BUTTON NAME Address Decimal Hex BUTTON NAME NUMBER OK NUMBER CONNECT(GREEN) NUMBER DISCONNECT (RED) NUMBER DIRECTORY NUMBER MENU NUMBER DELETE NUMBER STORE NUMBER PRESET NUMBER A NUMBER A B * B SCREEN MENU A (LEFT) C # C SCREEN MENU B (MIDDLE) D MAIN CAM D SCREEN MENU C (RIGHT) E AUX E F DOC F VCR P PC P SELFVIEW P SNAPSHOT FAR END PIP MOVE ZOOM OUT ZOOM IN VOLUME DOWN A VOLUME UP A B MIC OFF B C C D UP D E DOWN E F LEFT F TOUCH DETECT RIGHT LOW BATT D12161 Rev.09 11

12 2.4 Monitor(s) TANDBERG 2500 is supplied with either PAL or NTSC TV-monitor(s) depending on the country of use. The standard monitor is 29 (PAL), or 27 (NTSC). The system may also be supplied with XGA monitors (optional). In this case an Intelligent VGA <-> S-Video switching cable will be supplied for the second monitor. It must be connected to Dataport 1 and will switch to the VGA cable (thus XGA resolution on dual monitor) when PC is selected and S-Video cable (xcif resolution on dual monitor) when e.g. Main Camera is selected. Monitor Speakers: The amplifier and speakers of the main monitor is used to present audio from the TANDBERG 2500 codec. 2.5 Cabinet The TANDBERG 2500 Cabinet has a shelf right below the top plate for placing a VCR, remote controls etc. The Codec is located for easy access from the rear of the Cabinet and the Cabinet allows quick and easy assembly and disassembly of the Codec. The Cabinet is available in a dual version, which requires a dual top plate to be mounted on top of the single version Cabinet. D12161 Rev.09 12

13 3. Operation and User Interface The TANDBERG 2500 is normally operated via a hand-held, infrared remote control. TANDBERG 2500's simple and concise multi-coloured on-screen menu ensures that the user will be guided directly to the option or the feature required. The menu system is cursor driven and easy to use. With the intelligent on-screen user feedback the system always ensures the relevant information is given to the user. (E.g. if a channel is lost, the user will see on-screen text message please wait, re-establishing the call ). The Quick Keys (located on the top of the remote) relate to the three blocks at the bottom of the screen. The text on these blocks will change depending on which menu is selected. The user will hear a key tone when entering letters and digits via the remote control. The key tones may be turned off via the system s data port if desired. The TANDBERG 2500 can also be controlled via the data port of the Codec by using a comprehensive set of data port commands 6. This enables the Codec to be controlled by a different user interface, such as an AMX or Crestron system. The web browser can be used as another interface to the TANDBERG By connecting the codec to a LAN the codec may be accessed from a PC located on the same LAN or WAN; allowing the codec s features to be controlled remotely via the web interface. For information on how to operate the system, please see the TANDBERG 2500 User Manual supplied with the system. 6 Please, refer to TANDBERG API (Dataport User Guide) (D11943) D12161 Rev.09 13

14 4. Codec Interfaces Extensive use of industry standard interfaces and connectors ensure effortless integration of external equipment with the TANDBERG These interfaces can easily be controlled via one of the intuitive user interfaces. 4.1 Network Interfaces and Features Network Interfaces 3 x ISDN I.420 (RJ-45 Jack) Basic Rate Interface S/T (2B+D) up to 384 kbps 1 x X.21 / V.35 / RS449 with 1 x RS366 Call Control up to 384 kbps 1 x Ethernet (RJ-45 Jack) LAN interface (10/100 Mb) up to 1536 kbps The TANDBERG 2500 can easily switch between the different networks on-the-fly, via the user interface. The Codec does not need to reboot after changing the network. The supported networks are: 3 x BRI ISDN I.420 (RJ-45 jack) Basic rate interface S/T (2B+D) for up to 384 kbps 1 x X.21 or V.35 / RS449 with RS366 call control for special applications or leased line networks for transmission speeds up to 384 kbps with automatic detection of bit rates. 1 x Ethernet (RJ-45 jack) Local Area Network interface (10/100 Mb) for transmission speeds up to 1536 kbps. D12161 Rev.09 14

15 4.1.1 BRI ISDN Interface TANDBERG 2500 is supplied with the following BRI ISDN Protocols 7 : Euro-ISDN (ETSI) National ISDN AT&T custom Fetex ISDN Japan/Taiwan ISDN Australia ISDN 1-TR6 Italy ISDN Pinout of S/T Interface: 8 3 TX + 4 RX + 5 RX - 6 TX ISDN Subaddress & MSN Subaddress: It is possible to set a subaddress on the TANDBERG system when more than one system share ISDN lines (must be ordered from ISDN provider). From a TANDBERG system dialing with subaddress it is achieved by adding a star plus the subaddress at the end of the ISDN number. E.g. if the ISDN number is and the subaddress is 123, the number to dial into this system will be: *123 Incoming calls without subaddress will be handled by all units on that ISDN line (i.e. all systems would ring). For incoming calls with subaddress, only the unit with matching subaddress will accept the call. MSN: Multiple Subscriber Number is also implemented in the TANDBERG system. If MSN is set to ON, the system will only accept incoming calls to the ISDN numbers programmed in the ISDN settings menu. 7 Available networks correct at time of printing- additional networks may become available. 8 The cable of use should be a straight through configuration. D12161 Rev.09 15

16 4.1.2 NET Interface The NET interface provides several network protocols to be used with terminal adapters in special applications. The protocols supported are: Network protocols V.35 RS-449 RS-530 X.21 Dialling protocols/call control RS-366 Leased line Data triggered Manual mode Auto mode The above protocols are used for connection to special equipment supporting networks such as: Switched 56/64 kbps E1 Leased line 56/64 kbps T1 X.21 LAN Leased line (dedicated) T1/PRI ATM Circuit switched (dial up) T1/PRI The different configurations are described in the document Connecting external networks (D12096) and in special application notes available on the TANDBERG Technical documentation CD-ROM or by contacting your TANDBERG representative. A combination of external network (V.35\RS449\RS366\X21\Leased Line T1/E1) and IP sites is possible under the following prerequisites: A External Network party must be connected first No ISDN parties can be part of the conference. D12161 Rev.09 16

17 4.1.3 Ethernet / LAN Interface (H.323) 9 The RJ-45 jack for the Ethernet interface (manual or automatic detection of 10/100Mb) supports bit rates from 64 kbps up to 1536 kbps. The ITU-T standard H.323 v4 protocol is implemented in the TANDBERG The following features are specifically relevant for this network interface 10 : Default IP Password New systems or systems that have loaded factory defaults will have a default password TANDBERG all caps and the strict password enabled. Strict password: IP password that is at least 8 characters long and contains both letter and Numbers (alphanumeric). When off all IP password are accepted including blank ones. Command is: strictpassword <on/off> Default is on. The strict password needs to be disabled, via Data Port or Telnet to set a blank or simple password Quality of Service features (QoS) IP precedence IP precedence is a classification of packets from 0 (low priority) to 7 (high priority). The values 6 and 7 are typically reserved for congestion control. IP precedence helps a router select what kind of traffic to prioritise. By means of queue mechanisms, it can select which packets to send first and which to throw away. Some information/traffic is time critical while other is not, and classification is used to differentiate this traffic. One may set separate IP precedence for Signalling, Audio, Video and Data (values 1 7) as well as turn IP precedence off. The auto setting uses the following values for IP precedence: Signalling=6 Audio/Video=4 Data=3 (e.g. FECC commands) This means that in auto, IP precedence has the value 6 (i.e. signalling value) while both audio and video value is 4; data value is 3. Setting the IP precedence value in system s menu is actually setting the signalling value. The audio/video and data values are changed accordingly in respect to the signaling value (i.e. audio/video value = - 2; data value = - 3) Diffserv Diffserv is an extension of IP precedence, where one can set values from 0 to 63 (63=Highest priority) IP type of service (TOS) TOS helps a router select a routing path when multiple paths are available. 9 For further info on H.323, please refer to document TANDBERG and IP (D12434) 10 NOTE: E3/B8 software does not support T.120 when running H.323 calls D12161 Rev.09 17

18 Delay- tells router to minimize delay Throughput- tells router to maximize throughput Reliability- tells router to maximize reliability Cost- tells router to minimize cost Off- Turns TOS off Resource-Reservation Protocol (RSVP) RSVP is a protocol that allows the TANDBERG system to request the network to reserve the bandwidth needed for the IP call Automatic selection of H.323 or H.320 outgoing calls IP address or E.164 number dialling. Automatic selection based on network address type or predefined prefixes IP adaptive bandwidth management The codec never produces more traffic than needed, for better utilization of network resources. Most of the data sent in a videoconference is video data. Thus, by incorporating smart video algorithms, the codec sends no more video data than necessary. Little movement in the picture gives low bit rate; while a lot of movement gives higher bit rate. The codec regulates outgoing and incoming media bit rates by means of flow control signalling. An example of this is automatic adjustment of total bandwidth used when sites are added in a MultiSite call or when DuoVideo is added Gatekeeper authentication When set to auto, this feature automatically locates a gatekeeper on the same subnet and registers the system using the E.164 alias. If the gatekeeper supports alternate gatekeepers, the TANDBERG system will receive a primary and secondary gatekeeper address. If the primary gatekeeper fails, the system will register to the secondary gatekeeper that was declared by the primary gatekeeper. 11 Re-registration at the gatekeeper will occur regularly and automatically Registration to Call Manager The TANDBERG systems support registration to a CallManager. It is only possible to register the TANDBERG system to a CallManager when the gatekeeper registration is disabled, and the CallManager is configured with a H.323 client that matches the IP address and the E.164/phone number of the TANDBERG system. When the Use Gatekeeper is set to off, enable Use CallManager by setting it to On, and set the IP address of the CallManager in the CallManager IP field. The endpoint will now register to the CallManger The registration of a H.323 client in CallManager is supported on the CallManager (CCM) 4.0 software and forward. 11 alternate gatekeeper supported in the Cisco MCM Sw 12.2 gatekeeper D12161 Rev.09 18

19 Note: CallManager does not support features like Duo Video, H.264 and encryption. A TANDBERG endpoint registered to CallManager will loose these capabilities. There is no confirmation on the TANDBERG system that it is registered to a CallManager Configuring an H.323 client on the CallManager 4.0 To configure the CallManager with an H.323 client, log on to the administration web interface and go to the phone configuration page. The Phone configuration page is located on: device (top menu) -> Add a New device -> Phone -> H.323 Client. In the phone configuration page type the IP address of the TANDBERG system in the Device name field, select device pool and push the insert button. A pop-up box will now appear on the screen and ask you if you would like to configure the directory number. Push the ok button. You should now see the Directory Number Configuration WEB page. Enter the E.164/phone number of your TANDBERG system in the Directory number field, and in the Forward and Pickup Settings enter the time of No Answer Ring Duration. The time selected has to have a value from 1 to 300 seconds. Push the Add button to update the CallManager with the directory number settings. You have now configured the CallManager with a H.323 client and should be able to register the TANDBERG system to it. When the TANDBERG system is registered to a CallManager, it will be possible to place and receive calls from this system to any other video and voice systems that are registered on the same CallManager H.323 ID H.323 ID is a feature allowing text names instead of E.164 numbers to be dialled. The TANDBERG system will use the System Name as its H.323 ID. Even though one cannot dial out with an H.323 ID via the remote control one can use the web interface or the dataport. Other systems can also dial in using the H.323 ID Dynamic playout buffering Shapes the incoming data for better playout and re-sequencing of packets delivered out of order. This ensures better lip sync Asymmetrical media capabilities Audio and video protocols can be fully asymmetrical. E.g., the TANDBERG system can send H.263 and receive H.261 at the same time Diagnostic tools for IP Q.931 To show Q.931 trace during a call you need to issue the command syslog on. One can get traces for RAS, Q.931 and H.245 with this command. It is a complex trace and requires an extensive knowledge in H.323 signalling to be understood. Ping Ping is used to see if the codec is able to reach a specific IP-address, using a mechanism in IP called ICMP. If a codec is unable to register to its gatekeeper, or if it is unable to dial a specific endpoint, one can use ping to see if there is at least an IP-route to the gatekeeper or to the endpoint. In case you have problems, one would first ping the default gateway, then the gatekeeper, and then the other endpoint. D12161 Rev.09 19

20 Traceroute Technical Description of TANDBERG 2500 with software version E3/B8 Traceroute does exactly that; it traces the route an IP-packet takes to reach its destination and displays all router hops. Traceroute is very useful for seeing exactly where there is a routing-problem in the IP-network, and for checking where transport-delay is introduced NAT support Network Address Translation is implemented to support small/home office applications requiring a single endpoint behind a NAT router. NAT also supports the use of a gatekeeper outside the NAT router Latency & Jitter Latency is defined as the time between a node sending a message and receipt of the message by another node. The TANDBERG systems can handle any value of latencyhowever, the higher the latency, the longer the delay in video and audio. This may lead to conferences with undesirable delays causing participants to interrupt and speak over each other. Jitter is defined as the difference in latency. Where constant latency simply produces delays in audio and video, jitter can have a more adverse effect (e.g. the video may be blocky ). Jitter causes packets to arrive out of order or at the wrong times, which again leads to packet loss. TANDBERG can manage packets with jitter up to 100ms. If excessive packet loss is detected, the TANDBERG systems will downspeed the connection until acceptable packet loss is achieved Layer 4 Ports used in H.323 calls The layer 4 ports used by the system in a H.323 call can be defined as follows: Dynamic: The ports are allocated at random from 2048 to Static: Will use the predefinded layer 4 ports listed in the tables below. Point-to-point + Duo Video Function Port Type Gatekeeper Discovery (RAS) 1719 UDP Q.931 Call Setup 1720 TCP H.245 Range TCP Video Range UDP Audio Range UDP Data/FECC Range UDP MultiSite + Duo Video Function Port Type Gatekeeper Discovery (RAS) 1719 UDP Q.931 Call Setup 1720 TCP H.245* Range TCP Video Range UDP Audio Range UDP Data/FECC Range UDP (*) Note: While using MultiSite, if a site is disconnected and reconnected without terminating the entire conference, the next site to be connected will have a H.245 port outside of the specified range. If this functionality is required through a firewall, the range of TCP ports can D12161 Rev.09 20

21 be extended past However, if a site is disconnected and reconnected, without ending the conference enough times one can quickly end up outside of this range again IP packet sizes Audio The system automatically selects the most favourable IP packet size for audio. Depending on the network conditions, the system will send 20 ms or 40 ms of audio in each packet, thus: G /320 bytes per packet G /80 bytes per packet G /320 bytes per packet Video The system is sending maximum 1450 bytes of video per packet. Note: In addition, the system needs to add the following header information for each of the audio and video packets above: 20 bytes IP-header, 8 bytes UDP-header and 12 bytes RTP-header (i.e. 40 bytes in total). Packet loss: Packet loss is displayed in percentage (%) in the Call Status menu of the system. The number shown is the average of audio- and video- packets that are lost during the last 2 seconds Intelligent Packet Loss Recovery (IPLR) IPLR is an ITU standard based packet loss compensation for H.323 that improves received and transmitted video to/from the TANDBERG system. IPLR supports all video protocols and resolutions that TANDBERG systems already have implemented and is compatible with all terminals, Gateways and MCUs. IPLR is a special algorithm developed at TANDBERG that will make efforts to reconstruct the lost packets and reduce the visual effects caused by packet losses. In addition, IPLR will make transmitted data more resilient to lossy networks. IPLR transmission functionality can be disabled and re-enabled by a dataport command. 12 It is enabled by default. IPLR will automatically start when packet loss is detected on the H.323 network. (See also chapter on IP downspeeding ) IP Conflict Warning The TANDBERG system automatically checks whether its IP address has been assigned to another system on the same IP network. In case of double address assignment, the TANDBERG system will display an IP address conflict warning to the user. 12 refer also to TANDBERG API (Dataport User Guide) (D11943) D12161 Rev.09 21

22 Once a detected IP address conflict has been resolved, the TANDBERG system can be operated without reboot. D12161 Rev.09 22

23 4.1.4 Streaming 13 TANDBERG 2500 supports streaming of H.261 video and G.711 (µ-law) audio both when the system is in a call or outside a call. When inside a call, audio from both sides is streamed together with the video from the site that is on air (i.e. voice switched). It is also possible to force the video from either local or far end to be shown constantly. The streaming video may be displayed on the codec s web page. The streamed video/audio can be viewed on most free viewers, but TANDBERG recommends that Apple Quick Time is used. Streaming video rates available are: 16, 32, 64, 128, 192, 256 or 320 kbps. Streaming audio rate is fixed to 64 kbps. The streaming format RTP (over UDP) is supported on the TANDBERG system. For security purposes, streaming is disabled by default and may only be enabled from the main menu or the data port. However, start/stop and configurations can be set via web or telnet. A Streaming password may be set in order to prevent unwanted users streaming from the system. Streaming Chat: When streaming is viewed from the systems web page, it is possible to send messages to the system. The messages are displayed on the system s monitor Automatic announcement of Streaming The TANDBERG 2500 can be used in a Cisco IP/TV environment. The system periodically transmits a Session Announcement Protocol (SAP) message to inform clients where the streaming can be found. 13 Active streaming disables MultiSite and Duo Video. For further info on Streaming, please refer to the User Manual and the documents TANDBERG on Streaming (D12408 and D11934) D12161 Rev.09 23

24 4.1.5 Intelligent Call Management (ICM) By using TANDBERG's Intelligent Call Management (ICM), calls can be made from data rates of 56 kbps up to 384 kbps via ISDN networks. ICM is a highly sophisticated feature provided by the TANDBERG 2500 that makes the connection between two sites more reliable and safe. If the ISDN network drops channels during a call, the conference will not shut down but adjust to the remaining number of available channels 14. This ability is called Downspeeding and is in accordance to the BONDING Mode 1 standard. ISDN Downspeeding will be started when one of the following actions occurs: 1. Fallback to 2xH221 call when no BONDING framing is found 2. Non-matching number of channels (N) during BONDING setup (e.g. N=4 on site A, N=6 on site B) 3. Downspeeding during call setup caused by a channel that won't connect 4. Disconnect and downspeed if a channel won't sync 5. Downspeeding when detecting B-channels that are looped 6. Downspeeding if a channel drops during the call The TANDBERG system will also start the BONDING synchronization procedure if there is a long fatal failure situation: 7. Extended loss of H221 framing 8. Continuous BCH framing error in the video stream. If then a channel fails to sync, it will be disconnected (as mentioned in 4.) Downspeeding on IP: The TANDBERG system has a similar way of downspeeding on IP, described as follows: a) If system gets more than 10% packet loss during the last 2 seconds, it will go down 64 kbps. (Ex. Call set up on 768 kbps and the above packet loss occurs, the new callrate will be 768 kbps 64 kbps = 704 kbps). b) If after the next 2 seconds, there is still more than 10% packet loss, system will downspeed 64 kbps again. c) The above will happen until call rate of 192 kbps is reached. d) If still same packet loss at 192 kbps the system will upspeed back to original call rate (since when in this situation, one may assume that the packet loss is due to other reasons and not the H.323 call itself). Different from the ISDN downspeeding, the system will not change Audio and Video algorithms during the downspeeding of an IP call. (See also chapter on IPLR) Network Profiles The TANDBERG 2500 has 3 fixed and 3 programmable Name, Prefix and Protocol settings that may be used when dialling. The system will automatically make an H.320 call if the dialled number is an ISDN number or an H.323 call if an IP address is dialled. H.323 will also be selected if number prefix is matching the H.323 prefix and the system is registered to a gatekeeper. 14 Depending on the capability of the remote system to support downspeeding. D12161 Rev.09 24

25 4.1.7 Encryption The TANDBERG system has built-in encryption of audio, video and data for both H.323 (based on ITU standard H.235) and H.320 (based on ITU standard H.233 and H.234) calls. This feature supports DuoVideo, FECC, T , and point-to-point calls as well as MultiSite calls up to total 768 kbps. The encryption algorithms used in the TANDBERG system are: - The Data Encryption Standard (DES) with a 56 bit session key - The Advanced Encryption Standard (AES) with a 128 bit session key Although there are small differences between H.323 and H.320, a typical set-up of a secure call can be defined as follows: 1. Establishment of a common shared secret and selection of an encryption algorithm. 2. Exchange of the keys according to the common shared secret and the selected encryption algorithm. 3. Start the encryption. The establishment of the common shared secret is done through the computation of the Diffie- Hellman (DH) algorithm. The DH method uses prime numbers of 512 bits length for DES and 1024 bits for AES. The shared secret is then used as a key for the selected encryption algorithm, which encrypts "the session keys". When the session keys are collected by the remote end, encryption of the audio, video and data channels can start. 3 sites 4 sites Encryption AES or AES or DES AES or DES The above table shows type of network and maximum number of sites with the available Encryption algorithms that may be used. In a MultiSite call, encrypted and non-encrypted connections cannot be mixed. Consequently, all systems in a MultiSite call need to support encryption in order for the conference to be encrypted. If one endpoint in a MultiSite call does not support encryption, the MultiSite host will turn off encryption with all other endpoints as well. 15 T.120 not supported on H.323 point to point calls nor in MultiSite calls D12161 Rev.09 25

26 4.2 Aggregation Standards ISDN Aggregation H.221 Frame Structure from 64(56 * ) kbps to 128 kbps ISO BONDING, Mode 1 from 64(56 * ) kbps to 384 kbps BONDING ISO 13871, BONDING Mode 1 for bit rates from 56 kbps up to 384 kbps (1 to 6 channels). The TANDBERG system can handle relative delay difference between B-channels of up to 0.5 second (i.e. to compensate for different routing of channels). Example: Channel 1 is delayed 250 ms, channel 2 is delayed 500 ms and channel 3 is delayed 330 ms. The relative delay difference is then (max. min.), thus in this case it would be 500 ms 250 ms = 250 ms (0.250 sec). If delay difference is more than 0.5 seconds in a call, the TANDBERG system will display Corrupted data received and try to resynchronize the call. Note: Delay difference will vary depending on the different service providers involved in the call. The following are the standard bandwidths on H.320: 6ch H.221 For bit rates from 56 kbps up to 128 kbps (1 or 2 channels). The maximum relative delay difference between the 2 B-channels is 0.6 second. The system will only select H.221 if the far end does not support BONDING or when two ISDN numbers are dialled. Only 1 x 64 kbps H.221 support when External Network is used Encoding delay H.320: The latency in a point-to-point call using TANDBERG systems on H.320 (ISDN) varies between ms depending on the network performance. H.323: The latency in a point-to-point call using TANDBERG systems on H.323 (IP) varies between ms. (An additional 100ms have to be added for playout buffering). NOTE, the total delay of a call will be as follows: Encoding delay + Max. network delay + Decoding delay Network delay (and Delay difference) will vary depending on the different service providers involved in the call. Decoding delay is typically 1/3 of the encoding delay. D12161 Rev.09 26

27 4.3 Data Interface/Application Programmable Interface (API) Data Standards T.120 Data Communication Protocol Data TANDBERG Dynamic Data Channel (DDC) Modem Standard modem commands Auto/VISCA For control of camera connected to data port 2 Data Interfaces 2 x Data ports, RS-232 (9-pin D-sub), Up to Baud for Data & Control The dataports on TANDBERG 2500 are implemented as Digital Circuit Terminating Equipment (DCE). The pin-outs for both data ports are the same except pin no. 4, see note below. The connectors used are female 9-pin D-subs. The TANDBERG main camera is normally connected to Dataport 2 On Data port 2, pin number 4 provides 12V DC / 1 Amps to the main camera Signal Name Direction Pin number Carrier detect, CD From DCE 1 Receive data, RXD From DCE 2 Transmit data, TXD To DCE 3 Data terminal ready, DTR From DCE 4 Signal ground, GND 5 Data set ready, DSR From DCE 6 Ready to send, RTS To DCE 7 Clear to send, CTS From DCE 8 Ring indicator, RI From DCE Data Protocols Please refer to TANDBERG API (Dataport User Guide) (D11943) for details. There are several different modes for the data ports as described below. Data, Dynamic Data Channel mode (data port 1) When communicating between two TANDBERG products, this protocol enables the use of a multitude of applications such as: File transfer Diagnostics Application sharing remote control The Codec operates as a modem according to Hayes commands. Control mode (data port 1) In this mode, the Codec can be controlled by an external user interface. Modem mode (data port 1) When in a call - DDC mode is activated. When not in a call - Control mode activated. D12161 Rev.09 27

28 T.120 mode (data port 1) The T.120 data protocol enables systems from different manufacturers to do data conferencing- implemented by TANDBERG in the form of the T.120 data communication protocol (MLP). Enables the provision of data conferencing capabilities within an MCU call 16. Covers many different aspects of data conferencing such as application sharing and white boarding. Makes use of MLP and hence requires a suitable application matching your data communications requirements. TANDBERG recommends Microsoft NetMeeting version 2.0/2.1 or Intel s IBVC (Intel Proshare) for data conferencing. Maximum bandwidth for data in this mode is 32 kbps. VISCA (data port 2) For control of cameras using VISCA control protocol. AUTO (data port 2) The auto setting will automatically set the data port 2 dependent on equipment connected. The following equipment will be automatically identified: TANDBERG W.A.V.E. camera. The command set for this camera will be activated. Hayes compatible modem. The command set for Hayes will be activated. Other control devices. The data port will be set to Control mode Translation in RS232 cable for TANDBERG 2500 dual monitor (OPTIONAL) If equipped with the Natural Presenter Package (NPP), the XGA option 17, and a dual monitor, the TANDBERG 2500 system has an Intelligent VGA <-> S-Video switching device connected to Dataport 1 to utilize the local dual monitor. It will switch to the VGA cable (thus XGA resolution on dual monitor) when PC is selected and S-Video cable (xcif resolution on dual monitor) when e.g. Main Camera is selected. Furthermore, whenever the TANDBERG 2500 system receives a video stream / presentation in XGA resolution, the presentation will be displayed on the dual monitor. This is applicable to receiving XGA presentations on either the main or the duo video stream. The command translations done by the chip in the RS232 connector is shown below. From codec: *S dualmon open = To monitor 1: IN2 To monitor 2: IN4 back to codec: vgamon second From codec: *P vidin 5 = To monitor 1: IN2 To monitor 2: IN4 back to codec: vgamon second From codec: *P duovideo ready = To monitor 1: IN2 To monitor 2: IN2 back to codec: vgamon loop 16 Depending on the MCU s capability to support T XGA only supported from software E1 onwards D12161 Rev.09 28

29 From codec: *P vidin 1,2,3 or 4 = To monitor 1: IN2 To monitor 2: IN4 back to codec: vgamon loop Note: The command dualmon open is a common command for all DuoVideo sessions, and thus not only for PC. This means that duo video with aux, vcr and doc cam will also be shown in VGA mode. D12161 Rev.09 29

30 4.4 Video Interfaces and Video Features Technical Description of TANDBERG 2500 with software version E3/B8 Video Inputs Video Outputs Video Formats 2 x S-video, Mini-DIN Connector (1 S-Video Input is Used by the Main Camera) 2 x Composite, RCA Connector 1 x XGA, 15 pins Ethernet connector (used by PC Soft Presenter) 2 x S-Video, Mini-DIN Connector (Single/Dual Monitor) 2 x Composite, RCA connector (Single/Dual Monitor) 1 x XGA 18, 15 pins PAL or NTSC VGA, SVGA and XGA 17 (Native Resolutions) The TANDBERG 2500 Codec has the following video connectors: Video in PC VGA in VGA out 1. Main cam 2. Aux cam 3. Doc cam 4. VCR 1. Single 2. Dual 3. Single 4. Dual Video out Video Inputs Video Input 1-2 support S-Video through Mini-DIN connectors. Video Input 3-4 support composite signals through RCA connectors. Video Input 2 or 3 may be set as Document camera input from the menu settings (Selected with the remote control button Doc Cam and will transmit Digital Clarity by default). Levels: Composite; 1 V pp, 75 ohm S-Video (Y/C); Y: 1 V pp, 75 ohm C (PAL): 0.3 V pp, 75 ohm C (NTSC): 0.28 V pp, 75 ohm XGA Input ( PC Presenter ) The TANDBERG 2500 codec has a standard XGA Input. The supplied VGA cable should be connected to the codec s XGA Input, thus making it simple to use for ad hoc PC presentations with no need for additional hardware. The TANDBERG 2500 will transmit the Native Resolutions of XGA 17, SVGA or VGA without scaling. If the far end does not support H.263+ custom formats, the system has the ability to scale the XGA input to CIF and 4xCIF. 18 XGA only supported on E-software D12161 Rev.09 30

31 The following VGA, SVGA and XGA inputs are supported 19 : Technical Description of TANDBERG 2500 with software version E3/B8 VGA SVGA XGA 640X480_60Hz 800X600_56Hz 1024X768_60Hz 640X480_72Hz 800X600_60Hz 1024X768_70Hz 640X480_75Hz 800X600_72Hz 1024X768_75Hz 640X480_85Hz 800X600_75Hz 800X600_85Hz VGA, SVGA and XGA Pin layout Pin Function Volt/Ohm 1 Red signal 0.7v/75Ω 2 Green signal 0.7v/75Ω 3 Blue signal 0.7v/75Ω 4 Ground 5 Ground 6 Red ground 7 Green ground 8 Blue ground 9 No connection 10 Ground 11 No connection 12 No connection 13* Horizontal sync TTL 14* Vertical sync TTL 15 No connection (*) The system supports the synchronisation method RGBHV on both VGA input and output PC Soft Presenter (Optional) The system has implemented a feature that allows PC images to be shown to the codec. A software from Virtual Network Computing (VNC) needs to be installed on the PC to make use of this feature (free download from When correctly set up 20, the PC image will be used as video input by the system whenever the PC button is pressed on the remote control 21. Note: The VNC Server s Display Number and Password need to be set on the codec 22. Please, see the User Manual for guidelines of setting up the PC Soft Presenter. Note: PC Soft Presenter supports the same resolutions as the PC presenter (XGA input). In addition, the VNC server will scale any SXGA input down to XGA. 19 Implemented according to VESA standards- (VGA=Video Graphics Array, SVGA=Super VGA, XGA= extended VGA). Note: If image from PC in use is not displayed correctly, changing the PC s resolution to XGA -> VGA may help. 20 If problems getting VNC to work, one may have to update the driver(s) for the PC graphical card and/or the PC network card 21 The VNC program must be installed as a Server on the PC in use (the codec being the client) and supports Windows, Unix and Macintosh. 22 Password is encrypted D12161 Rev.09 31

32 4.4.4 Video Outputs Video Output 1 and 3 provides main video (incoming/self view [and PIP], Still Image and menu). Video Output 2 and 4 provides Self-view and Still Image Graphics (Dual monitor). Video Output 1-2 supporting S-Video through Mini-DIN connectors. Video Output 3-4 supporting Composite signals through RCA connectors Levels: Composite; 1 V pp, 75 ohm load S-Video (Y/C); Y: 1 V pp, 75 ohm load C (PAL): 0.3 V pp, 75 ohm load C (NTSC): 0.28 V pp, 75 ohm load XGA Output 23 TANDBERG 2500 is provided with an XGA output port that automatically scales the imageswhen required- to fit XGA monitors. The XGA output may be set as either a single or dual monitor. It may also be set to Loopback, in which case video from the XGA input is shown on the XGA output. The following VGA, SVGA and XGA outputs are supported and may be received as Native Resolutions from a remote system: VGA SVGA XGA X480_60Hz 800X600_60Hz 1024X768_60Hz Note: By pressing the following buttons on the remote control it is possible to toggle between the settings VGA out loop and VGA out main: Snapshot Far End Snapshot 1 TANDBERG 2500 has an Intelligent VGA <-> S-Video switching device connected to Dataport 1 to utilize the local dual monitor. It will switch the to VGA cable (thus SVGA resolution on dual monitor) when PC is selected and S-Video cable (xcif resolution on dual monitor) when e.g. Main Camera is selected (ref. ch ). Furthermore, whenever the TANDBERG 2500 system receives a video stream / presentation in XGA resolution, the switching device will switch to VGA output. The presentation will then be displayed on the dual monitor. This is applicable to receiving XGA resolution on the main or the duo video stream. 23 XGA only supported on E-software D12161 Rev.09 32

33 4.4.6 Optimized Video Compression The ITU standard H.263 provides: Optimized compression and decompression of video at lower bandwidths. A sharper picture than provided by H.261. Improved contrast and enhanced clarity of the finer details within an image. Improved motion handling that removes the characteristic blocking that tends to occur during normal H.261 movement. Near broadcast quality motion handling (icif/isif) is achieved with the implementation of certain H.263 annexes, commonly referred to as H.263+ (annex N) and H (annex W). 4xCIF/4xSIF live video The ITU standard H.264 provides considerably better video quality at lower bandwidths. It has been developed with strong TANDBERG participation in joint workgroups of ITU-T and ISO. H.264 is based on the ISO standard MPEG-4. The TANDBERG 2500 system supports H.264 video compression in both CIF and SIF resolutions. 24 An encoding and decoding rate of a high-quality 30fps is achieved. H.264 may be used on the TANDBERG 2500 system for bandwidths of up to 768 kbps. Under the preconditions named above and depending on the far end s H.264 support, the TANDBERG system will select H.264 as video compression standard if H.264 has been activated in the menu. In case H.264 is unavailable at the far end or if the above preconditions are not fulfilled, the TANDBERG system will preferably select H.263. The TANDBERG system will select H.261 only in case the far end system supports no better video compression algorithm. 24 H.264 only supported from software E2 onwards D12161 Rev.09 33

34 4.4.7 Intelligent Video Management (IVM) It is possible to configure the picture sent from the system depending upon specific requirements and applications adding an additional level of flexibility and adaptability: Generally, the IVM will always try to transmit the format closest to the video input format. Motion: When there is a need for higher frame rates, typically when a large number of participants are present or when there is a lot of motion in the picture. At low bit rate: CIF will be used from a PAL video input SIF from NTSC VGA/SVGA/XGA from PC, Digital Clarity At high bit rate: icif will be used from a PAL video input, Natural Video isif from NTSC, Natural Video VGA/SVGA/XGA from PC, Digital Clarity Sharpness: Improved quality of detailed images and graphics, lower frame rate, ideal for enhancing quality at lower bandwidths. 4xCIF will be used from a PAL video input, Digital Clarity 4xSIF from NTSC, Digital Clarity VGA/SVGA/XGA from PC, Digital Clarity Auto: Selected when there is a need for both motion handling and high quality of images and graphics. The system will automatically adjust frame rate and sharpness dependent on movement. At low bit rate: CIF will be used from a PAL video input SIF from NTSC VGA/SVGA/XGA from PC, Digital Clarity At high bit rate: icif will be used from a PAL video input, Natural Video isif from NTSC, Natural Video VGA/SVGA/XGA from PC, Digital Clarity When Document Camera is selected: 4xCIF will be used from a PAL video input, Digital Clarity 4xSIF from NTSC, Digital Clarity D12161 Rev.09 34

35 IVM Resolution The following table shows relationship between Transmission modes selected by the system when Motion or Sharpness is set in the Call Quality menu. IVM will use this table to optimize the Video quality, according to the capabilities of the remote system(s): Basic Video Video Transmission mode selection rules 25 Quality Input MOTION PAL -> CIF -> QCIF MOTION NTSC -> -> -> CIF -> QCIF MOTION VGA CIF -> QCIF MOTION SVGA CIF -> QCIF MOTION XGA CIF -> QCIF SHARPNESS PAL 4xCIF -> VGA -> CIF -> QCIF SHARPNESS NTSC 4xSIF -> 4xCIF -> VGA -> SIF -> CIF -> QCIF SHARPNESS VGA VGA -> 4xCIF -> CIF -> QCIF SHARPNESS SVGA SVGA -> 4xCIF -> VGA -> CIF -> QCIF SHARPNESS XGA XGA -> SVGA -> 4xCIF -> VGA -> CIF -> QCIF Duo Video (Optional) The TANDBERG 2500 is capable of receiving and transmitting two simultaneous H.320 (ISDN or NET interfaces) or H.323 video signals 26. Automatic Duo Video set up When DuoVideo mode is set to Auto and the remote control buttons DocCam, Aux, VCR or PC are selected, the system will use this video input as its Duo Video source. The call bandwidth will be split between the main video (including audio etc.) and the Duo Video. Once the Main camera is selected, the system will use all its bandwidth for this video source. When network is H.323: The system will use approximately 1/2 of its original bandwidth for Duo Video (i.e. the system decides the DuoVideo rate according to the available HSD 27 data rates- the DuoVideo rate will be less than the main video rate for higher call rates). When network is ISDN: The following table applies for Duo Video Bandwidths*: Call rate (kbps) Duo Video rate (kbps) * For restrict use 56k multiples: E.g > 56, 168 -> 56 etc When using the Duo Video feature the main video bandwidth can be calculated by using the formula below: 25 System will always try the first transmission mode, and then try the one to the right and so on (as indicated by the arrows) until the proper transmission mode is found. 26 Only possible if the far site can receive Duo Video and both sites have two monitors connected. Natural Video is not supported in Duo Video mode. 27 Only possible when both systems have software B3 or later. Description of HSD is found in ITU recommendations: H.221, H.242 and H.243 D12161 Rev.09 35

36 Main video rate = Call rate DuoVideo Audio Framing (1.6 kbps) Encryption control (0.8 kbps) E.G., A 320kbps call using G.722 (56kbps) audio will use: 320kbps = kbps for main video It is possible to change the picture quality (e.g. Digital Clarity) even after a Duo Video signal is set up (Presentations Menu Duo Video Quality). Note: In a MultiSite call, the MultiSite host can transmit Duo Video to the other sites if these sites have Duo Video support. If some of the connected sites are single monitor systems and have software B5 or later the single monitor systems will see the Duo Video picture (e.g. presentation) and the Duo Video sites will see both presenter and the presentation. The Duo Video functionality supports all H.320 standards, thus it is possible to call two ordinary systems, but there is no audio transmitted in the second duplex H.320 signal. Duo Video is supported using the H.263 and H.261 video compression standards Single Monitor Duo Video (Optional) Even in a single monitor or single projector configuration with Natural Presenter Package (NPP), the TANDBERG system is able to transmit and receive DuoVideo. Transmitting DuoVideo, both the local DuoVideo source (e.g. presentation) and the remote participant will be shown on the single monitor using the fullscreen image and the picture-inpicture (PIP) image. The selfview button is used to toggle the fullscreen source and the PIP source. Receiving DuoVideo, both the remote DuoVideo source (e.g. presentation) and the remote participant will be shown on the single monitor using the fullscreen image and the picture-inpicture (PIP) image. The selfview button is used to toggle the fullscreen source and the PIP source. D12161 Rev.09 36

37 Digital Clarity (Optional 28 ) TANDBERG 2500 has the ability to transmit and receive live images using the Native Resolutions VGA, SVGA, XGA or 4xCIF/4xSIF. This feature is called Digital Clarity. When the document camera or the PC is selected, Digital Clarity is automatically selected by the system- the live picture quality will then be crystal clear and the frame rate lower compared to using CIF/SIF 29. (See also ch Intelligent Video Management ) The Selfview picture will always be shown in PAL/NTSC video quality. Whenever the TANDBERG 2500 system receives a video stream / presentation in XGA resolution, the presentation will be displayed on the high-resolution dual monitor. This is applicable to receiving XGA resolution on the main or the duo video stream Natural Video (icif/isif) 30 The TANDBERG 2500 is capable of handling interlaced CIF/SIF live video quality. Using the ITU standards H.263+ and H capabilities, icif/isif enables TANDBERG 2500 to transmit and receive a true interlaced video image near TV quality (i.e. 60 fields per second). Note: Natural Video may only be used on bandwidths of 384 kbps and above and will automatically be selected at bandwidths of 768 kbps and above if supported by the other system. Natural Video is disabled in H.323 Multi Site calls, H.320 Continous Presence Multi Site calls, Duo Video calls and if VGA output is used as Main or Dual Monitor Native Resolutions The following live video resolutions are supported on the system: Native NTSC 31 : 4xSIF Interlaced SIF SIF Native PAL: 4xCIF Interlaced CIF CIF QCIF SQCIF (704 x 480 pixels), Digital Clarity (352 x 480 pixels), Natural Video (352 x 240 pixels) (704 x 576 pixels), Digital Clarity (352 x 576 pixels), Natural Video (352 x 288 pixels) (176 x 144 pixels) (128 x 96 pixels) Native PC Resolutions: XGA 32 (1024 x 768 pixels), Digital Clarity SVGA (800 x 600 pixels), Digital Clarity VGA (640 x 480 pixels), Digital Clarity 28 Receive Digital Clarity is implemented on all TANDBERG systems (Transmit Digital Clarity is part of the NPP software packet) 29 Only possible if the remote site can transmit/receive video in 4xCIF/4xSIF, VGA, SVGA, XGA. 30 To exclude the sending of icif/isif formats and prevent Interlaced bearer capabilities to be set on system, turn Natural Video off. 31 Source Input Format SIF (4xSIF, isif) is an NTSC based video format (Defined in MPEG-1 standard). 32 XGA only supported on E-software. D12161 Rev.09 37

38 One-touch Snapshot The TANDBERG 2500's intelligent One-touch Snapshot button makes it easy to send and receive an image of the highest possible resolution. If calling to a dual monitor system the still image will appear on the dual monitor. A preview of the still image is possible (set-up in the presentation setting). To send a snapshot inside a MultiSite call a snapshot can be sent to all other participants from the site that holds the floor. If the far end supports H.263+ custom formats, snapshot can be sent in VGA, SVGA, XGA or 4xSIF. If the far end does not support H.263+ custom formats, snapshot will be sent in 4xCIF. It is possible to configure the system to always send snapshots from a particular video input, but requesting a snapshot from another system will always display the current image (i.e. the far end image seen on screen). Snapshot is implemented according to the ITU standard H.261 Annex D. By using the Selfview button one may toggle between the last sent/received snapshot and the self-view picture (shown on the dual monitor). It is also possible to view a still image on singlemonitor systems Screen Saver If the system is not in a call, a text string will be shown on the monitor screen after 9 minutes. The user is prompted to select screen saver delay of 30 minutes, 60 minutes or 3 hours. If the user does not respond within 1 minute, the screen saver is activated and both monitors will go black (i.e. the codec sends out a black image). Once the remote control is touched (or any other activation of the system; such as an incoming call), the screen saver will be switched off. If the system is used for local presentation (i.e. not in a call) it is possible to delay the screensaver prompt via the Quick Keys on the remote control (for 1 or 3 hours). D12161 Rev.09 38

39 4.5 Audio Interfaces and Audio Features Technical Description of TANDBERG 2500 with software version E3/B8 Audio Inputs Audio Outputs 2 x Microphone, 24V Phantom Powered, XLR Connector 2 x Audio, RCA Connector (Line Level) 3 x Audio, RCA Connector (Line Level) The TANDBERG 2500 Codec has the following audio connectors: Audio Inputs The TANDBERG 2500 Codec has a total of 4 audio inputs, two microphone audio inputs and two line level inputs. General: The input gains on all four inputs are independently adjustable. All four inputs can be independently enabled or disabled. By default, all inputs are enabled, ready to be connected with an audio source. All audio input signals are mixed together if enabled. Inputs that are disabled will be muted automatically. When selecting Restore Defaults, all audio settings will be set to factory-programmed values. The default settings are correct for Audio Technica AT871-R microphone (Mic in 1-2) and for most consumer electronics (CD-players, cassette recorders, VCRs, etc., Audio in 3-4). After installation, audio input level settings should remain unchanged. When storing presets, the selected audio settings are stored together with the video inputs/camera positions. D12161 Rev.09 39