T1 and E1 Network Modules

Table Of Contents

Connecting Cisco T1 and E1 Network Modules to the Network

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

Related Documents

Obtaining Documentation, Obtaining Support, and Security Guidelines

Connecting Cisco T1 and E1 Network Modules to the Network

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Revised: May 1, 2008, OL-16631-01

This guide describes how to connect Cisco T1 and E1 network modules to your network. 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

•Related Documents

•Obtaining Documentation, Obtaining Support, and Security Guidelines

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.

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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

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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

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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 1 shows the front panel and LEDs. The LEDs are described in Table 1.

Figure 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 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:

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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 2.

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

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Related Documents

For additional information, see the following documents and resources.

Related Topic	Document Title
Regulatory compliance and safety information	Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information http://www.cisco.com/en/US/docs/routers/access/interfaces/rcsi/IOHrcsi.html
Cisco IOS software website and reference documentation	Cisco IOS Software http://www.cisco.com/web/psa/products/index.html?c=268438303

Obtaining Documentation, Obtaining Support, and Security Guidelines

For information on obtaining documentation, obtaining support, providing documentation feedback, security guidelines, and also recommended aliases and general Cisco documents, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

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