384A Adapter Installation Instructions

Size: px

Start display at page:

Download "384A Adapter Installation Instructions"

Agnes Pierce
6 years ago
Views:

1 Instruction Sheet Issue 9, October 2012 SYSTIMAX Solutions 384A Adapter Installation Instructions General The 384A adapter (Figure 1) is a broadband video adapter that provides connectivity to the 1061/2061 Category 5e, 1071/2071 Category 6, and 1081/2081 Category 6 24-AWG high performance 4-Pair unshielded twisted-pair (UTP) wiring. The 384A adapter is used in pairs to provide horizontal intrabuilding connectivity of broadband Community Antenna Television (CATV) distribution equipment. The 384A adapter performs common-mode filtering, balancing, and impedance matching. The 384A adapter is connected to the building wiring at an information outlet (IO) in the work area and a modular or 110-jack distribution panel in the telecommunications closet. A CATV signal originating at the headend (Figure 2) is amplified using a commercially available broadband indoor distribution amplifier and transmitted on coaxial cable in the Riser Backbone Subsystem to a CATV coaxial distribution panel located in the telecommunications closet. The distribution panel would contain a number of multitap passive splitters. The 384A adapter serves as the connecting cord between each splitter port and each modular jack on a Category 5 modular or 110-jack distribution panel serving the horizontal subsystem. The CATV signal is then transmitted exclusively over SYSTIMAX 1061/2061, 1071/2071, or 1081/ AWG 4-Pair UTP cabling to an information outlet in the work area where it is then fed to the television or set-top box receiver via a second 384A adapter. No intermediate connection points should be installed between the CATV coaxial and UTP horizontal distribution panel or at the IO located in the work area. The 384A adapter currently supports only Category 5 T568B jack wiring for Pair 2. For installations using T568A outlets, contact your SYSTIMAX Authorized Representative. Connectivity of CATV distribution equipment over SYSTIMAX cabling adheres to standard CATV industry installation design practices. These practices are intended to minimize picture interference due to the ingress of in-band, non-catv signals, while maximizing the carrier-to-noise ratio (CNR) of the CATV signal and insuring that a nominal 0 dbmv is received at the television or set-top box receiver. The SYSTIMAX cabling solution for the distribution of broadband CATV signals is designed to deliver the maximum number of CATV channels to the desktop while ensuring that non- CATV signals, such as high speed data signals, do not share the same frequency bandwidth as CATV signals. Ordering information is listed below: Material ID Description A Adapter ALSO CLASSIFIED BY UNDERWRITERS LABORATORIES INC. IN ACCORDANCE WITH IEC PUBLICATION 950. Tested to FCC Rules and Regulations Part 76, and CISPR Pub. 22 for Class B Equipment CommScope, Inc. All rights reserved Page 1 of 7

2 Instruction Sheet How to Contact Us To find out more about CommScope products, visit us on the web at For technical assistance: - Within the United States, contact your local account representative or technical support at Outside the United States, contact your local account representative or Authorized Business Partner. - Within the United States, report any missing/damaged parts or any other issues to CommScope Customer Claims at Outside the United States, contact your local account representative or Authorized Business Partner. Figure 2. Typical 384A Adapter Configuration Based on this design approach and the testing of radiated emission levels to FCC Part 76 and CISPR Pub.22, Class B emission standards, SYSTIMAX supports the delivery of the following number of channels listed below. This support is based on providing a nominal signal level of at least 0dBmV (1 mv) to the receiver of a television or set-top box, both within a 4-Pair shared cable sheath and between bundled 4-Pair cable carrying voice, data rates up to 16 Mbps Token Ring, and baseband video, using a combination of SYSTIMAX 1061/2061, 1071/2071, or 1081/ AWG 4-Pair cable and the 384A adapter. Page 2 of 7

3 Issue 9, Octiber 2012 The delivery of up to (77) 6-MHz bandwidth CATV channels over UTP cabling distances of up to 196 ft (60 m) based on FCC Part 76 radiated emission testing. The delivery of up to (28) 6-MHz bandwidth CATVchannels over UTP cabling distances of up to 328 ft(100 m) based on FCC Part 76 radiated emission testing. The delivery of up to (28) 6-MHz bandwidth CATVchannels over UTP cabling distances of up 196 ft (60m) based on CISPR Pub. 22, Class B emission testing. The delivery of return CATV channels for the sub-,mid-, and high-split frequency bands starting at 5 MHz. Note: The cable distances specified above include a pair of 384A adapters and assumes that some degree of line equalization (slope) is performed in order to compensate for the increase in cable loss that results as the number of channels transmitted are increased. Slope compensation is typically performed within the distribution amplifier, via an external line equalizer placed at the output of the distribution amplifier, or a combination of both. Note: In order to ensure that radiated emission levels for both FCC Part 76 and CISPR Pub. 22 Class B are not exceeded at the supported distances, it is recommended that a transmit level of no greater than +37 dbmv (70 mv) appear at any multitap splitter port. Figure 3. Typical Horizontal Wiring Arrangement Using 384A Adapters The number of supported channels will be reduced for channel bandwidths of 7 and 8 MHz and when data signals such as 100 Mbps (TP-PMD) and 155 Mbps (ATM) are also being transmitted along with CATV signals in bundled 4- Pair cables. TP-PMD and ATM signaling protocols use frequency bandwidths of approximately 125 MHz and 155 MHz respectively. External filtering of these data signals may be required in order to minimize any interference into the CATV signal, thus maximizing cable distance and the number of CATV channels supported. For more information, contact your SYSTIMAX Authorized Representative. Specifications Bandwidth: 5 MHz to 550 MHz Insertion Loss: less than 5 db Return Loss: greater than 20 db Common Mode Rejection: greater than 40 db Signal to Noise Ratio: greater than 60 db Input Impedance: 75 ohms Output Impedance: 100 ohms Page 3 of 7

4 Instruction Sheet IMPORTANT SAFETY INSTRUCTIONS When using this product, basic safety precautions should always be followed to reduce the risk of fire, electric shock, and injury to persons, including the following: 1. Read and understand all instructions. 2. Follow all warnings and instructions marked on the product. 3. Never install telephone jacks in a wet location unless the jack is specifically designed for wet locations. 4. Never install this product during a lightning storm. There is a remote risk of electric shock from lightning. 5. Never touch uninsulated communication wires or terminals. 6. CAUTION: All wiring that connects to this equipment must meet applicable local and national building codes and network wiring standards for communications cable. 7. CAUTION: This product shall not be installed on wire distribution systems exposed to either lightning or power cross faults. 8. This product is intended to connect to Safety Extra Low Voltage (SELV) only and is not intended for connection to the telephone network. SAVE THESE INSTRUCTIONS Installation To install a 384A adapter, perform the following steps: CAUTION: Do not attempt to open the housing. There are no user-serviceable parts inside the 384A adapter. Prying open the housing will damage the adapter and void your warranty. 1. Determine that an adequate radio frequency (RF) transmit signal level and carrier-to-noise ratio (CNR) is present at the F-type connector on each multitap splitter port. The minimum required RF transmit level is based on overcoming cable and adapter losses over a given band of channel frequencies that results in a nominal RFsignal level of 0 dbmv at the television or set-top box receiver. Refer to Tables 1 and 2 for cable and adapter losses and operating distances. Note: FCC rules recommend that the receive level not be less than 0 dbmv or great enough to cause receiver overload. CATV industry practice typically allows a receive signal level range of +/-10 dbmv. The CNR determines the quality of the transmitted picture image. The FCC requires a CNR of at least 43 db. 2. For a channel outside the supported frequency bands, use a commercially available channel converter to place that channel on a carrier within the supported frequency bands. 3. Make certain that the IO or modular jack distribution panel to which you will connect the 384A adapter is wired properly and labeled appropriately to identify the circuit. Figure 3 illustrates a typical horizontal wiring arrangement. 4. Connect the F-type connector plug on the 384A adapter directly to the F-type connector jack of the multitap splitter port and television or set-top box receiver. 5. Insert the modular plug on the 384A adapter into the modular jack of an IO or jack panel carefully, so as not to place stress on the F-type connector plug or the back of the 384A adapter. CAUTION: Do not extend the 384A adapter cables on either the coaxial or UTP side. Extending these cables may cause the adapter to operate improperly and is not authorized by the warranty. Removal of the modular plug in order to punch down the adapter cordage onto a 110 field is acceptable. Sample CATV Design Calculations Table 1 lists cable and adapter losses. Table 2 lists the maximum cable distances over which CATV signals can be transmitted that can result in a nominal signal level of 0 dbmv at the receiver of a television or set-top box and not exceed the radiated emission levels established by FCC Part 76 and CISPR Pub. 22, Class B. The cable distances listed include a pair of 384A adapters. The following two examples use the information found in Tables 1 and 2. Both examples assume that the televisions are all the same cable distance from the closet. This is typically not the case. Cable distances less than those cited in these two examples may require the use of an in-line attenuator in order to reduce the receive signal level at the television. Page 4 of 7

5 Issue 9, Octiber 2012 Example 1. You need to deliver 6 MHz bandwidth CATV channels located in the frequency band of to MHz (s 2 through 78) to a number of televisions located a distance of 164 ft (50 m) from the telecommunications closet while not exceeding the radiated emission levels specified by FCC Part 76. Table 2 confirms that this can be supported over SYSTIMAX. First, calculate the transmit level needed at each multitap splitter port located in the telecommunications closet based on the cable and adapter losses associated with the highest channel frequency ( 78, MHz) to be transmitted. Using Table 1: (cable loss Ch. 78) x 50m +9.5 (adapter pair loss) =36.0dB of loss A transmit level of dbmv would be required at each multitap splitter port in order to provide a minimum of 0 dbmv to each television when it is tuned to 78. Next, calculate the cable and adapter losses associated with the lowest channel frequency ( 2, MHz) to be transmitted. Using Table 1: (cable loss Ch. 2) x 50m (adapter pair loss) =11.0dB of loss Calculating the difference between these two losses is then used to determine the receive signal level for the lowest channel ( 2): = 25.0dB This level of receive signal may cause receiver overload, therefore some degree of line equalization should be implemented. Line equalization of at least 25 db would be required to achieve a nominal 0 dbmv receive signal level for each channel in this example. Line equalization can be implemented by adjusting the slope control of a 50- to 550-MHz distribution amplifier for 7 db of slope (distribution amplifiers typically offer up to 10 db of slope), and placing an internal 50 to 550 MHz line equalizer, providing 18 db of slope, within the distribution amplifier. The output of the distribution amplifier is then fed to a CATV multitap splitter distribution panel. The gain of the distribution amplifier should be set so that the RF signal level at each of the splitter ports serving the 50 m cable runs is a nominal +36 dbmv. Example 2. You need to deliver 6 MHz bandwidth CATV channels located in the frequency band of to MHz (channels 2 through 29) to a number of televisions located a distance of 295 ft (90 m) from the telecommunications closet while not exceeding the radiated emission levels specified by FCC Part 76. Table 2 confirms that this can be supported over SYSTIMAX. Using Table 1: (cable loss Ch.29) x 90m (adapter pair loss) =36.5dB of loss A transmit level of dbmv would be required at each multitap splitter port in order to provide a minimum of 0 dbmv to each television when it is tuned to 29. Next, calculate the cable and adapter losses associated with the lowest channel frequency ( 2, MHz) to be transmitted. Using Table 1: (cable loss Ch.2) x 90m+ 3.5 (adapter pair loss) =17.0dB of loss Calculating the difference between these two losses is then used to determine the receive signal level for the lowest channel ( 2): = 19.5dBmV This level of receive signal may cause receiver overload, therefore some degree of line equalization should be implemented. Line equalization of at least 20 db would be required to achieve a nominal 0 dbmv receive signal level for each channel in this example. Line equalization can be implemented by adjusting the slope control of a 50- to 300-MHz distribution amplifier for 4 db of slope (distribution amplifiers typically offer up to10 db of slope) and placing an internal 50 to 300 MHz line equalizer, providing 18 db of slope, within the distribution amplifier. Line equalization of greater than 20 db is required because both the distribution amplifier and external line equalizer compensate for a frequency band of 50 to 300 Hz, not 50 to 253 MHz. The output of the distribution amplifier is then fed to a CATV multitap splitter distribution panel. The gain of the distribution amplifier should be set so that the RF signal level at each of the splitter ports serving the 90-m cable runs, is a nominal +37 dbmv. Page 5 of 7

6 Instruction Sheet Table 1. Cable and Adapter Losses Table 1. Cable and Adapter Losses (Continued) Frequency /2061 Cable Loss (db/meter) A Adapter Loss (db/pair) Frequency /2061 Cable Loss (db/meter) Table 2. Operational Distance Limitations Ch Ch Ch. 2-6 & 14 Ch Ch. 7-13, FCC Part 76: Frequency Range CISPR Class B: Frequency Range A Adapter Loss (db/pair) Maximum Distance ft (m) 328 (100) 196 (60) Maximum Distance ft (m) 328 (100) 230 ( 70) 196 ( 60) Troubleshooting If your equipment malfunctions with 384A adapters in place, follow the troubleshooting procedures below: 1. Measure to ensure for acceptable signal level and CNR at the transmitter/receiver F-type connectors. 2. Perform diagnostics on your CATV distribution equipment by following the manufacturer s instructions. Page 6 of 7

7 Issue 9, Octiber Check all connections and SYSTIMAX wiring,ensuring that you are plugged into the proper IO. 4. The Automatic Gain Control (AGC) circuitry typically used in a CATV receiver is extremely sensitive, down to -40dBmV (10 mv). Therefore, adjacent cable crosstalk may be received as a snowy picture image if the adapter is plugged into the wrong IO, or if the wiring is incorrect. 5. Replace the 384A adapter with one that is known to be working. 6. If you still cannot diagnose the problem, contact your SYSTIMAX Authorized Representative. Page 7 of 7

BLONDER TONGUE LABORATORIES, INC.

BLONDER TONGUE LABORATORIES, INC. One Jake Brown Road, P.O. Box 1000 Tel: (732) 679-4000 Old Bridge, NJ 08857-1000 USA Fax: (732) 679-4353 DESIGNING THE DISTRIBUTION SYSTEM DISTRIBUTION SYSTEM Since the