Connecting 8-Port T1/E1 Network Modules

Table Of Contents

Connecting 8-Port T1/E1 Network Modules

Cisco T1/E1 Network Module

Safety Warnings for the Cisco T1/E1 Network Module

Cisco T1/E1 Network Module LEDs

Connecting a T1/E1 Network Module to a Network

Connecting 8-Port T1/E1 Network Modules

This chapter describes how to connect 8-port T1/E1 network modules for Cisco integrated service routers. It contains the following sections:

• Cisco T1/E1 Network Module

• Safety Warnings for the Cisco T1/E1 Network Module

• Cisco T1/E1 Network Module LEDs

• Connecting a T1/E1 Network Module to a Network

Cisco T1/E1 Network Module

The Cisco T1/E1 network module provides 8 ports of clear channel or channelized T1 and E1 support to Cisco 3800 series integrated services routers:

•Cisco 3825

•Cisco 3845

T1 support has integrated CSU/DSU capability.

Safety Warnings for the Cisco T1/E1 Network Module

The following safety warnings apply to installation procedures involving the Cisco T1/E1 network module. Translations of these warnings are available in the Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information document, which is available online.

Warning To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables. Statement 1021

Warning Hazardous network voltages are present in WAN ports regardless of whether power to the unit is OFF or ON. To avoid electric shock, use caution when working near WAN ports. When detaching cables, detach the end away from the unit first. Statement 1026

Cisco T1/E1 Network Module LEDs

The T1/E1 network module has 2 LEDs for each port that indicate the functionality of the T1 or E1 connection. Figure 38-1 shows the front panel and LEDs. The LEDs are described in Table 38-1.

Figure 38-1 8-Port T1/E1 Network Module Front Panel

1

RJ-48C connector

2

Port number

3

CD/LP LED (bicolor LED)

4

AL LED

5

EN LED

CD/LP LEDs are bicolor LEDs with both green and yellow emitters.

Table 38-1 T1/E1 Network Module LEDs

LED

Color

Description

CD/LP

Green/Yellow

Off: No carrier detected

Green on (CD): Carrier detected

Yellow on (LP): Port in loopback mode

AL

Yellow

Off: No alarms

On: Port in alarm mode

EN

Green

Off: Network module does not pass self-test and is not available to the router. There is a failure with either the module or the slot.

On: Network module has passed self-test and is available to the router.

The network module may be removed from router when the EN LED is off.

Connecting a T1/E1 Network Module to a Network

Use straight-through RJ-48C-to-RJ-48C cables to connect T1/E1 ports to RJ-48C jacks.

To connect a T1/E1 port to the network, complete the following steps:

Step 1 Connect one end of the cable to a T1/E1 port on the network module.

Step 2 Connect the other end to the RJ-48C jack at your site, as shown in Figure 38-2.

Figure 38-2 Connecting a T1/E1 Port to an RJ-48C Jack

1	RJ-48C connector	2	Port number
3	CD/LP LED (bicolor LED)	4	AL LED
5	EN LED

LED	Color	Description
CD/LP	Green/Yellow	Off: No carrier detected Green on (CD): Carrier detected Yellow on (LP): Port in loopback mode
AL	Yellow	Off: No alarms On: Port in alarm mode
EN	Green	Off: Network module does not pass self-test and is not available to the router. There is a failure with either the module or the slot. On: Network module has passed self-test and is available to the router. The network module may be removed from router when the EN LED is off.