Datasheet

1-5
PA-MC-T3 Port Adapter Installation and Configuration
OL-2695-05
Chapter 1 Overview
Cables, Connectors, and Pinouts
• The system bus recognizes one of the following:
– PA-MC- T 3
– Catalyst RSM/VIP2 with a PA-MC-T3
– Catalyst 6000 family FlexWAN module with a PA-MC-T3
– VIP with a PA-MC-T3
If any of the above conditions is not met, or if the initialization fails for other reasons, the enabled LED
does not go on.
Note In addition to the interface status information provided by the LEDs, you can also retrieve detailed
interface status information either through the router’s console port or through Telnet or Simple Network
Management Protocol (SNMP).
Cables, Connectors, and Pinouts
The interface connectors on the PA-MC-T3 are RG-59 coaxial BNC types, with one connector and cable
for transmit (TX) and one for receive (RX). The BNC connectors are transformer-coupled to the
PA-MC-T3 line interface unit (LIU), which is the analog physical interface on the PA-MC-T3.
The pinout and signal descriptions for the BNC connectors on the PA-MC-T3 are as follows:
• Transmit (TX)—Transmitted signals appear on the center contact, and the outer shield is ground for
the 75-ohm RG-59 coaxial cable you attach to the TX BNC connector.
• Receive (RX)—Received signals appear on the center contact, and the outer shield is ground for the
75-ohm RG-59 coaxial cable you attach to the RX BNC connector.
Caution To prevent problems, you must check your 75-ohm RG-59 coaxial cable specifications when long cable
lengths are required to connect the PA-MC-T3 to your external DS3 (T3) equipment.
You must install a ferrite sleeve (also called a common-mode choke) on each 75-ohm coaxial cable to
reduce the effects of electromagnetic interference (EMI). (Cisco Systems supplies two ferrite sleeves
with your PA-MC-T3, one for each of the two 75-ohm coaxial cables.)
Note You must attach the ferrite sleeve on the end of each coaxial cable, nearest the PA-MC-T3, as close to
the BNC connector as possible. (See Figure 1-3.)
Caution The ferrite sleeve prevents electromagnetic interference (EMI) from affecting the T3-equipped system
and is a required component for proper system operation.