Connecting T1/E1 IMA Network Modules

This chapter describes how to connect 4- and 8-port T1 and E1 IMA (Inverse Multiplexing for ATM) network modules for Cisco modular routers. It contains the following sections:

IMA Network Modules

This section provides information about the following network modules for Cisco modular routers:

4-port T1 IMA network module, Cisco product number NM-4T1-IMA. (See Figure 13-1.)
8-port T1 IMA network module, Cisco product number NM-8T1-IMA. (See Figure 13-2.)
4-port E1 IMA network module, Cisco product number NM-4E1-IMA. (See Figure 13-3.)
8-port E1 IMA network module, Cisco product number NM-8E1-IMA. (See Figure 13-4.)

Each port provides 1.544 Mbps/2.048 Mbps connectivity, and IMA's aggregation of multiple T1/E1 links increases bandwidth inexpensively to allow wide-area networking (WAN) uplinks at speeds ranging up to a T3/E3 link.

Figure 13-1: 4-Channel IMA T1 Network Module

Figure 13-2: 8-Channel IMA T1 Network Module

Figure 13-3: 4-Channel IMA E1 Network Module

Figure 13-4: 8-Channel IMA E1 Network Module

Connecting T1/E1 IMA Ports to the Network

To connect a T1/E1 IMA network module to a network, use a straight-through RJ-48C-to-RJ-48C cable to connect the T1 or E1 port to an RJ-48C wall jack. (See Figure 13-5.)

Figure 13-5: Connecting a T1/E1 IMA Network Module to an RJ-48C Wall Jack

IMA Network Module Interface Numbering

An individual (ungrouped) interface on the IMA network module is numbered by interface type and slot and port number, for example atm 0/2.

An interface that is part of an IMA group loses its individual port number, but adopts the IMA group number, for example atm 0/ima2.

Up to four groups can be created (numbered 0 through 3).

T1/E1 IMA Network Module LEDs

All network modules have an enable (EN) LED. The enable LED indicates that the module has passed its self-tests and is available to the router. T1/E1 IMA network modules have the additional LEDs shown in Figure 13-6 and described in Table 13-1.

Figure 13-6: T1/E1 IMA Network Module LEDs

Table 13-1: T1/E1 IMA Network Module LEDs

LED Color Meaning

AL

Yellow

Alarm indicating loss of signal, loss of frame, or unavailability because of excessive errors.

LP

Yellow

Controller local loopback.

CD

Green

Carrier received on telco link.

LED	Color	Meaning
AL	Yellow	Alarm indicating loss of signal, loss of frame, or unavailability because of excessive errors.
LP	Yellow	Controller local loopback.
CD	Green	Carrier received on telco link.

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