Table Of Contents
Installing the 75-120-Ohm Adapter Cable on E1 Multichannel Port Adapters
Connecting the 75-120-Ohm Adapter Cable
Obtaining Technical Assistance
Installing the 75-120-Ohm Adapter Cable on E1 Multichannel Port Adapters
Product Number: CAB-ADPT-75-120(=), CAB-ADPT4PK-75-120(=)
Introduction
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:
•Connecting the 75-120-Ohm Adapter Cable
•Obtaining Technical Assistance
Product Description
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
Pin Signal1
Rx ring1
2
Rx tip
3
NC2
4
Tx ring3
5
Tx tip
6
NC
7
NC
8
NC
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
Obtaining Documentation
These sections explain how to obtain documentation from Cisco Systems.
World Wide Web
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Documentation CD-ROM
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Ordering Documentation
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We appreciate your comments.Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.
Cisco.com
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Technical Assistance Center
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•Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration.
•Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.
•Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.
•Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.
The Cisco TAC resource that you choose is based on the priority of the problem and the conditions of service contracts, when applicable.
Cisco TAC Web Site
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If you are a Cisco.com registered user, and you cannot resolve your technical issues by using the Cisco TAC Web Site, you can open a case online by using the TAC Case Open tool at this URL:
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If you have Internet access, we recommend that you open P3 and P4 cases through the Cisco TAC Web Site.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to this URL:
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