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Product Number: CAB-ADPT-75-120(=), CAB-ADPT4PK-75-120(=)
This document describes how to connect the 75-120-ohm adapter cable on any Cisco 120-ohm E1 multi-channel port adapter that must connect to a 75-ohm unbalanced G.703 line. The 75-120-ohm adapter cable can be purchased individually (CAB-ADPT-75-120) or in prepackaged four-packs (CAB-ADPT4PK-75-120).
Use this publication in conjunction with the port adapter installation and configuration note that shipped with your port adapter.
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The 75-120-ohm adapter cable connects Cisco 120-ohm E1 port adapters to 75-ohm unbalanced G.703 lines. The adapter has an eight-pin RJ-48C connector on the 120-ohm side and dual BNC coax connectors (transmit and receive) on the 75-ohm side (see Figure 1). The 120-ohm E1 ports of your port adapter connect to the 75-120-ohm adapter cable using RJ-48C connectors and Category 3 or 5 shielded foil twisted-pair (FTP) cable with 120-ohm impedance (see Figure 2).
shows the pinouts of the RJ-48C connector on the 75-120-ohm adapter cable.
| Pin | Signal |
|---|---|
1 | Rx ring1 |
2 | Rx tip |
3 | NC2 |
4 | Tx ring3 |
5 | Tx tip |
6 | NC |
7 | NC |
8 | NC |
| 1Rx = receive. 2NC = no connection. 3Tx = transmit. |
Connect the 75-120-ohm adapter cable between the port adapter and the 75-ohm unbalanced G.703 line using the following procedure (see Figure 3):
Step 1 Attach the Category 3 or 5 FTP cable directly to the RJ-48C port on the E1 multi-channel port adapter.
Step 2 Attach the network end of your Category 3 or Category 5 cable to your 75-120-ohm adapter cable.
Step 3 Attach the BNC connector of the 75-120-ohm adapter cable marked receive to the network device connector marked transmit.
Step 4 Attach the BNC connector of the 75-120-ohm adapter cable marked transmit to the network device connector marked receive.
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Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or as an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
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Posted: Sun May 9 17:18:11 PDT 1999
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