Prisma Optical Networks Ancillary Modules

Transcription

1 Optoelectronics Prisma Optical Networks Ancillary Modules Description The Prisma platform is capable of utilizing a combination of modules which address a variety of revenue generating applications. The platform also supports important reliability enhancing features such as redundant power supplies, Status Monitoring and Control (with CIM) and network switching. The Prisma Family of Ancillary Modules Includes: Headend Driver Amplifiers Designed to operate within the Prisma platform, the Model 647 Headend Driver Amplifier is engineered to provide exceptional RF signal boost to meet the requirements of the Prisma optical transmitters. (Pages through 5) Reverse Headend Amplifiers The Model 647-R Reverse Headend Driver Amplifier provides reverse path RF amplification to support network efficiency. (Pages 6 through 9) Driver Amplifier Optical Switches Avaialable in either 1310 nm or 1550 nm configurations, the Model 6474 Optical Switch works in the Prisma platform to provide optical backup and line redundancy for both short and long reach applications. (Pages 10 through 13) 1 GHz RF Switch Similar to the Model 6474 Optical Switches, the Model 6974 RF Switch provides the same switching security of RF signals for increased network efficiency. (Pages 14 through 17) Optical Switch RF Switch

2 Prisma Optical Networks - Ancillary Modules Model MHz Headend Driver Amplifier Description The Model 647 Headend Driver Amplifier is an indoor RF amplifier for use in the headend or hub network and is a valuable addition to the Prisma family of products. Its purpose is to amplify or "boost" the RF signal level to meet the input requirements of the Prisma optical transmitters. The Model 647 utilizes a PHD hybrid and features an easily accessible, variable attenuator and equalizer to provide optimum signal level and a flat input to the transmitter. Configured in conjunction with a Model 6477 Interface Module, two Model 647 modules can be housed in a single width unit of the Prisma Chassis. The Model 647 is externally powered by the Prisma power supply which reduces heat and extends the life of the hybrid. Features Designed to operate within the Prisma platform Compact size saves headend space (up to 18 modules/chassis) MHz pass band Front side serviceable for ease of setup and maintenance Status LEDs indicate module condition and simplify troubleshooting Variable attenuator and equalizer Blind-mate (push-on) RF and DC connectors RF input test point (-0 db) Internal current sensing circuitry monitors the operation of the hybrid Forward Driver Amplifier

3 Model MHz Headend Driver Amplifier Block Diagram 3

4 Model MHz Headend Driver Amplifier Specifications RF Units Notes RF Bandwidth MHz Frequency Response (deviation from flat response) db ± 0.55 Return Loss (minimum) db Input Typical Return Loss (minimum) Output Typical db MHz MHz MHz MHz MHz MHz Noise Figure (maximum) db 50 MHz 750 MHz 870 MHz Module Gain (minimum) (typical) Variable Attenuator Variable Equalizer Distortions Composite Triple Beat Composite Second Order Cross Modulation db db in 1 db steps db in 1.5 db steps TYPICAL RF Test Points db -0.0 ± 1.0 db MINIMUM Electrical Units Notes Operating Temperature Range C 0 to 50 5 F +3 to +1 Power Supply (nominal) V DC 4 Power Consumption W DC 17.0 maximum Mechanical Units Notes Physical Dimensions Depth in. cm Width in. 1.6 cm 4.1 Height in. 6.4 cm 16.3 Weight lbs kg Notes: 1. Distortions measured with 110 unmodulated (CW) NTSC analog channels at 30 dbmv flat output ( MHz). Distortions may degrade 0.5 db at high temperature.. With Model 6477 Interface Module and two Model 647 HEDAs. 3. With attenuator and equalizer set to 0.0 db. 4. Return loss can degrade by 1 db at high temperature. 5. Recommended for use only in non-condensing environments. Unless other wise notes, specifications are based on measurements made in accordance with NCTA Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 30 C (86 F) at the inlet to the Chassis cooling fans. 4

5 Model MHz Headend Driver Amplifier Ordering Information Model 647 Headend Driver Amplifier Required Accessories 6477 Interface Module Related Equipment Model 6470-R Prisma Chassis 5655 Prisma Blank Panel Prisma Model 647-R Reverse Headend Driver Amplifier Note: 1. One required per two Model 647 modules (assumes Prisma Chassis is already present). For other Prisma Modules refer to the Prisma Platform Data Sheet. 5

6 Model 647-R 5 00 MHz Reverse Headend Driver Amplifier Description The Prisma platform is capable of utilizing a combination of modules which address a variety of revenue generating applications. The platform also supports important reliability enhancing features such as redundant power supplies, Status Monitoring and Control (with CIM) and network switching. The Model 647-R Reverse Headend Driver Amplifier is designed to add to this flexibility. The Model 647-R provides amplification in the reverse path RF bandwidth and is typically an integral part of the reverse combining network. Ease of installation, setup, and maintenance are inherent with the Model 647-R and are of great benefit in both complex and basic -way systems. When used with other Prisma modules, such as the Model 6971-DR Dual Reverse Receiver, the Model 647-R can provide advanced RF signal level control for deployment of advanced reverse path services. Features Designed to operate within the Prisma platform Compact size saves headend space 5-00 MHz pass band Front side serviceable for ease of setup and maintenance Status LEDs indicate module condition and simplify troubleshooting Variable attenuator and equalizer Blind-mate (push-on) RF and DC connectors RF input test point (-0 db) Internal current sensing circuitry monitors the operation of the hybrid Reverse Driver Amplifier 6

7 Model 647-R 5 00 MHz Reverse Headend Driver Amplifier Block Diagram 7

8 Model 647-R 5 00 MHz Reverse Headend Driver Amplifier Specifications RF Units Notes RF Bandwidth MHz 5 00 Frequency Response (deviation from flat response) db ± 0.5 Return Loss db 5-80 MHz Noise Figure db 9 4 Module Gain (minimum) (typical) db 80 MHz 80 MHz Variable Attenuator 0 3 db in 1 db steps Variable Equalizer db in 1 db steps Distortions (typical) db 1 Composite Triple Beat Composite Second Order 75 7 RF Input Test Point db -0.0 ± 1.0 db Electrical Units Notes Operating Temperature Range C 0 to 50 3 F +3 to +1 Power Supply (nominal) V DC 4 Power Consumption W DC 8.1 maximum Mechanical Units Notes Physical Dimensions Depth in. cm Width in. 1.6 cm 4.1 Height in. 6.4 cm 16.3 Weight lbs kg Notes: 1. Distortions measured at 0 C with 8 dbmv / channel output level for unmodulated (CW) NTSC channels between 7 MHz and 175 MHz.. With Model 6477 interface module and two Model 647-R HEDAs. 3. Recommended for use only in non-condensing environments. 4. With attenuator and equalizer set to 0 db. Unless otherwise noted, specifications are based on measurements made in accordance with NCTA Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 30 C (86 F) at the inlet to the Chassis cooling fans. 8

9 Model 647-R 5 00 MHz Headend Driver Amplifier Ordering Information Model 647-R Reverse Headend Driver Amplifier Required Accessories 6477 Interface Module Related Equipment Model 6470-R Prisma Chassis 5655 Prisma Blank Panel Prisma Model 6971-DR Dual Reverse Receiver Note: 1. One required per two Model 647 modules (assumes Prisma Chassis is already present). For other Prisma Modules refer to the Prisma Platform Data Sheet. 9

10 Model nm and 1550 nm Optical Switches Description The Prisma platform is capable of using a combination of modules which address a variety of revenue-generating applications. The platform also supports important reliability enhancing features such as redundant power supplies, Status Monitoring and Control (with CIM), and network switching. The Model and 1310 nm Optical Switches add to the reliability of the Prisma platform by providing optical backup and redundancy. The 1550 nm wavelength is typically used in high power / longhaul systems which employ externally modulated transmitters and in-line optical amplifiers. The 1550 nm optical switch provides backup for both these devices. The 1310 nm wavelength is typically used in HFC type networks with relatively short optical spans. The 1310 nm optical switch provides for transmitter, receiver, and/or optical path redundancy. Both the 1310 and 1550 nm optical switches can be switched by any one of four methods: loss of light, front panel (manual) operation, status monitoring and control, or external alarm input. Another important feature is switch hysteresis. These two user definable values prevent the switch from going back to the primary input until it is completely stable. Optical Switch Features Designed to operate within the Prisma platform (single-width module) Provides redundancy for long or short haul links Loss of optical power detection Large optical power dynamic range (-13 to +18 dbm) Front side serviceable for ease of setup and maintenance Advanced LCD display Status LEDs indicate module condition and simplify troubleshooting Blind-mate (push-on) RF and DC connectors Time out setting (set by user) that prevents false reactivation of the switch before a reliable signal has been restored Input power threshold (set by user) to determine when a switch occurs Both automatic and manual switch modes Status Monitoring and Control capable Can be connected to an external alarm system 10

11 Model nm and 1550 nm Optical Switches Block Diagrams Input A Input B Optical Detector A Model 6474 Optical Switch (1310 nm) Optical Switch Output C Output D Optical Detector B Microprocessor Back Plane and SMC Bus Front Panel Display and Keypad Input A Input B Model 6474 Optical Switch (1550 nm) Optical Switch Output C Optical Detector A Optical Detector B Microprocessor Back Plane and SMC Bus Front Panel Display and Keypad T663 11

12 Model nm and 1550 nm Optical Switches Specification Optical Units Notes Optical Interface Pigtail 4 SC/APC SC/UPC FC/UPC E000/APC Standard Optional Optional Optional Nominal Optical Wavelength nm nm for P/N nm for P/N Optical Input Power Range dbm -13 to Return Loss db 60 3 Insertion Loss db 1310 nm nm Cross Talk db 1310 nm 1550 nm Electrical Units Notes Sense and Switch Time ms <60 Operating Temperature Range C 0 to +50 F +3 to +1 Power Consumption W DC 4W maximum (when switching) W typical Switching Threshold db 1 10 (user changeable) Restore Threshold db (user changeable) Wait Time Minutes 0 1 in 0.5 minute steps Mechanical Units Notes Physical Dimensions Depth in. cm Width in. cm Height in. cm Weight lbs kg 6.7 Notes: 1. Optical input power of -3.0 dbm or greater is required to maintain the full user-controlled threshold range. When the optical input power is less than -3 dbm there is a 1 for 1 reduction in threshold range.. Recommended for use only in non-condensing environments. 3. For the optical switch only, without optical connectors. When used with an optical connector, the module return losses and insertion losses are determined by the performance of the optical connector. 4. Pigtail is approximately 3 meters long. Unless otherwise noted, specifications are based on measurements made in accordance with NCTA Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 30 C (86 F) at the inlet to the Chassis cooling fans. 1

13 Model nm and 1550 nm Optical Switches Ordering Information Model nm Optical Switch (SC/APC) nm Optical Switch (must specify connector type FC/UPC, SC/UPC, E000/APC) nm Optical Switch (must specify connector type FC/UPC, SC/UPC, E000/APC) Related Equipment Model 6470-R Prisma Chassis 5655 Prisma Blank Panel Prisma 1 GHz RF Switch Prisma Communications Interface Module (CIM) Notes: and use a bulkhead connector for the output. The two inputs use 3-meter pigtails uses four, 3-meter pigtails. 13

14 Prisma Optical Networks Ancillary Modules Model GHz RF Switch Description The Prisma platform utilizes a combination of modules which address a variety of revenue-generating applications. The platform also supports important reliability enhancing features such as redundant power supplies, remote monitoring/control via Transmission Network Control System (TNCS) software with CIM module, and network switching. The Prisma Model GHz RF Switch adds to the reliability of the Prisma platform by providing RF backup and redundancy capability. The RF Switch can be switched by any one of four methods: loss of pilot, front panel (manual) operation, remotely via TNCS, or external alarm input. Another important feature is switch hysteresis. This feature allows the user to set both the level and the duration that the primary RF input must be present before the switch returns to the primary state after a fault. This prevents switching back to the primary input until that input is completely stable. Features Designed to operate within the Prisma platform Can be used in 1 x N redundancy configuration Loss of pilot detection RF Switch Front side serviceable for ease of setup and maintenance Advanced LCD display Status LEDs indicate module condition and simplify troubleshooting Blind-mate (push-on) RF and DC connectors RF input and output test points Wait time (set by user) that prevents false reactivation of the switch before a reliable signal has been restored Input level threshold (set by user) to determine when a switch occurs Both automatic and manual switch modes Remote monitoring and control capable (TNCS and Communications Interface Module required) Can be connected to an external alarm system 14

15 Model GHz RF Switch Block Diagram From Controller Input A Pad To Test Point A Plug-In Filter Detector To Controller From Controller RF Output From Controller To Output Test Point Input B Pad To Test Point B Plug-In Filter Detector To Controller 15

16 Model GHz RF Switch Specifications General RF Performance Units Notes Passband MHz Frequency Response db ± 0.4 RF Input Range dbmv 15-50,3 Return Loss MHz db 15 RF Isolation - port to port db > 60 3 Insertion Loss See Chart (below) 1 RF Test Points Input relative to RF output port ± 1.5 db Output relative to RF output port ± 1.0 db db db Sense and Switch time ms > 60 Switch Hysterisis Switch level Detector Accuracy Return Level Return Time db db db Min in 0.5 db steps ± in 0.5 db steps 0-1 in 0.5 Minute steps RF Detector Pilot Frequency MHz See Ordering Information Electrical Units Notes Operating Temperature Range C 0 to 50 4 F +3 to +1 Power Consumption W DC 7.6 Mechanical Units Notes Physical Dimensions Depth in. cm Width in. cm Height in. cm Weight lbs kg Insertion Losses Frequency (MHz) Typical Maximum Notes: 1. With 0 db plug-in pads.. When the RF input level is below +5 dbmv the detection accuracy for switching threshold is 1.5 db. 3. RF input levels must be within 0 db of each other to maintain 60 db minimum isolation. 4. Recommended for use in non-condensing environments. Unless otherwise noted, the above specifications reflect typical station performance in the recommended operating configuration (s). Specifications are based on measurements made in accordance with NCTA Recommended Practices for Measurements on Cable Television Systems using standard frequency assignments and are referenced to 0 C (68 F) at the inlet to the chassis cooing fans 16

17 Model GHz RF Switch Ordering Information Model 6974 RF Switch (w/ MHz Pilot filter) RF Switch (w/445.5 MHz Pilot filter) Related Equipment Model 6470-R Prisma Chassis 5655 Prisma Blank Panel Model 6474 Optical Switch 1310 nm Model 6474 Optical Switch 1550 nm Model 6478 Communications Interface Module (CIM) Scientific-Atlanta, the Scientific-Atlanta logo, and Prisma are registered trademarks of Scientific-Atlanta, Inc. Specifications and product availability are subject to change without notice. 001 Scientific-Atlanta, Inc. All rights reserved. Scientific-Atlanta, Inc or Rev A June