Table Of Contents
Installing the 75-120-Ohm Adapter Cable on E1 Multichannel Port Adapters
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 multichannel port adapter that must connect to a 75-ohm unbalanced G.703 E1 line. The 75-120-ohm adapter cable can be purchased individually (CAB-ADPT-75-120) or in prepackaged four-packs (CAB-ADPT4PK-75-120). This document contains the following sections:
The 75-120-ohm adapter cable connects Cisco 120-ohm E1 port adapters to 75-ohm unbalanced G.703 E1 lines. The adapter has an eight-pin RJ-48C connector on the 120-ohm side and dual BNC coaxial connectors (transmit and receive) on the 75-ohm side. Two switches on the 120-ohm side allow the outer conductor of the cable (the input port of the E1 port adapter) to be either isolated from or connected to a protected earth ground (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 Category 5 shielded foil twisted-pair (FTP) cable with 120-ohm impedance (see Figure 2 and Figure 3).
Note Early versions of this cable do not have the ground switches.
Figure 1 75-120-Ohm Adapter Cable
Figure 2 E1 Multichannel Port Adapter Interface Cable and RJ-48C Connector
Table 1 shows the pinouts of the RJ-48C connector on the 75-120-ohm adapter cable.
Table 1 RJ-48C Connector Pinouts
1 Rx = receive.
2 NC = no connection.
3 Tx = transmit.
Connecting the 75-120-Ohm Adapter Cable
Connect the 75-120-ohm adapter cable between the port adapter and the 75-ohm unbalanced G.703 E1 line using the following procedure:
Step 1 Set the two ground switches to the desired position.
Note To ground the outer conductor of the cable, both switches must be in the down position. To isolate the outer conductor of the cable from ground, both switches must be in the up position (see Figure 1).
Step 2 Attach the Category 3 or Category 5 FTP cable directly to the RJ-48C port on the E1 multichannel port adapter.
Note To comply with CE marking requirements, use shielded foil twisted-pair (FTP) cable with 120-ohm impedance.
Step 3 Attach the network end of your Category 3 or Category 5 cable to your 75-120-ohm adapter cable.
Step 4 Attach the BNC connector of the 75-120-ohm adapter cable marked receive to the network device connector marked transmit.
Step 5 Attach the BNC connector of the 75-120-ohm adapter cable marked transmit to the network device connector marked receive.
Figure 3 Connecting a 75-120-Ohm Adapter Cable to a Multichannel E1 Port Adapter
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