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Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
OL-5052-08
Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
24-Port Channelized T1/E1 ATM CEoP SPA Overview
RJ-45 Cable Pinouts
T1 lines from individual subscribers are attached to 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 ATM CEoP SPAs to each other, you must cable
both SPA’s patch panels together using a T1 cross-over cable or a T1 straight-through cable. The type of
cable you use (cross-over or straight-through) depends on how the CEoP SPAs are cabled to their patch
panels:
•
If both 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 cross-over cable to connect the
patch panels to each other.
Line 21
TX Tip
TX Ring
22
72
21
46
Not connected
RX Tip
RX Ring
46
96
Not connected
21
46
Line 22
TX Tip
TX Ring
23
73
22
47
Not connected
RX Tip
RX Ring
47
97
Not connected
22
47
Line 23
TX Tip
TX Ring
24
74
23
48
Not connected
RX Tip
RX Ring
48
98
Not connected
23
48
Line 24
TX Tip
TX Ring
25
75
24
49
Not connected
RX Tip
RX Ring
49
99
Not connected
24
49
Table 3-41
24-Port Channelized T1/E1 ATM CEoP SPA Cable Connector Pinouts (continued)
Subscriber
Connector Pins
Line
Signal
SPA
TX Cable Lead
RX Cable Lead
