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Chapter 3
Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs
Table 3-53
Subscriber
Line
Line 24
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:
•
•
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:
•
•
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
OL-14126-15
24-Port Channelized T1/E1/J1 CEoP SPA Cable Connector Pinouts (continued)
Connector Pins
Signal
SPA
TX Tip
25
TX Ring
75
RX Tip
49
RX Ring
99
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.
–
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.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
24-Port Channelized T1/E1/J1 ATM CEoP SPA Overview
TX Cable Lead
RX Cable Lead
24
Not connected
49
Not connected
24
49
3-85
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Troubleshooting
