Cisco Adapter Cable - converts 75 ohms - 120 ohms CAB-ADPT-75-120-OEM Benutzerhandbuch

Copyright © 1999—2002. Cisco Systems, Inc. All rights reserved.

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

). 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 

 and 

Early versions of this cable do not have the ground switches.