3-84
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
OL-14126-12
Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs
24-Port Channelized T1/E1/J1 ATM CEoP SPA Overview
RJ-45 Cable Pinouts
T1 lines from individual subscribers are attached to the RJ-45 connectors on the front of the 24-port
patch panel. Each RJ-45 port accommodates an individual T1 subscriber line.
Pins 1 and 2 and 4 and 5 of the RJ-45 connectors are used for the 24-port CEoP SPA’s Transmit (TX)
and Receive (RX) signals. Depending on how the cable is installed between the SPA and its patch panel
(rear), the RJ-45 connectors operate as follows:
• If the TX cable lead is connected to Transmit on the patch panel and RX is connected to Receive:
–
The SPA’s TX signals are transmitted on RJ-45 pins 1 (ring) and 2 (tip).
–
The SPA’s RX signals are received on RJ-45 pins 4 (ring) and 5 (tip).
• If the TX cable lead is connected to Receive on the patch panel and RX is connected to Transmit:
–
RJ-45 pins 1 and 2 are used for the SPA’s RX signal.
–
RJ-45 pins 4 and 5 are used for the SPA’s TX signal.
Patch Panel Cabling
If you are connecting two 24-Port Channelized T1/E1/J1 CEoP SPAs to each other, you must cable both
the SPA’s patch panels together using a T1 crossover cable or a T1 straight through cable. The type of
cable you use (crossover or straight through) depends on how the CEoP SPAs are cabled to their patch
panels:
• If both the CEoP SPAs are connected to their patch panels in the same manner (TX to Transmit and
RX to Receive, or TX to Receive and RX to Transmit), use a T1 crossover cable to connect the
patch panels to each other.
• If both the CEoP SPAs are connected to their patch panels in a different configuration (TX to
Transmit and RX to Receive on one SPA, and TX to Receive and RX to Transmit on the other SPA),
use a T1 straight through cable (standard RJ-45 patch cable) between the patch panels.
24-Port Channelized T1/E1/J1 CEoP SPA Patch Panel
A 24-port channelized T1/E1/J1 CEoP SPA patch panel with the DCC2484/25T1-S part number is
available from Optical Cable Corporation (OCC) at:
http://www.occfiber.com/main/index.php
This is a shielded rack mount 24-port patch panel, 2RU, accessory component for the Cisco PID
SPA-24CHT1-CE-ATM. You can view the image of patch panel with the DCC2484/25T1-S part number
at:
http://www.occfiber.com/main/index.php?m=1&p=2&s=Y&l=en&it=54&i=193
Line 24 TX Tip
TX Ring
25
75
24
49
Not connected
RX Tip
RX Ring
49
99
Not connected 24
49
Table 3-53 24-Port Channelized T1/E1/J1 CEoP SPA Cable Connector Pinouts (continued)
Subscriber Connector Pins
Line Signal SPA TX Cable Lead RX Cable Lead
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