3-9
Cisco 7600 Series Router SIP, SSC, and SPA Hardware Installation Guide
OL-5052-08
Chapter 3 Overview: Cisco 7600 Series Router Shared Port Adapters
8-Port Channelized T1/E1 SPA Overview
8-Port Channelized T1/E1 SPA Interface Specifications
The E1 interface on the 8-Port Channelized T1/E1 SPA uses RJ-48c receptacles for E1 (120-Ohm) cables
with RJ-45 connectors. You can use all ports simultaneously. Each E1 connection supports interfaces that
meet G.703 standards. The RJ-45 connection does not require an external transceiver. The E1 ports are
E1 interfaces that use 120-ohm unshielded twisted pair (UTP) cables.
8-Port Channelized T1/E1 SPA Cables, Connectors, and Pinouts
Figure 3-4
shows an RJ-45 connector.
Note
The terms RJ-45 and RJ-48c are sometimes used interchangeably. The RJ-48c is the jack or receptacle;
the RJ-45 is the connector.
Figure 3-4
RJ-45 Connector
Table 3-7
describes the signals and connector pinouts for RJ-45 cable connectors.
Table 3-6
8-Port Channelized T1/E1 SPA LEDs
LED Label
Color
State
Meaning
C/A
Off
Off
Port is not enabled by software.
Green
On
Port is enabled by software, and there is a valid T1 or E1 signal
without any alarms.
Amber
On
Port is enabled by software, and there is at least one alarm.
A/L
Off
Off
Port is not enabled by software.
Green
On
Port is enabled by software, loopback is off.
Amber
On
Port is enabled by software, loopback is on.
STATUS
Off
Off
SPA power is off.
Amber
On
SPA power is on and good, and SPA is being configured.
Green
On
SPA is ready and operational.
32770
RJ-45
RJ-48c
Pin 1
Pin 8
Table 3-7
RJ-45 Connector Pinouts
Pin
Signal
Description
1
RX–
Receive ring –
2
RX+
Receive tip +
