Table Of Contents
Connecting Cisco T1 and E1 IMA Network Modules to the Network
Revised: May 1, 2008, OL-12816-01
This guide describes how to connect Cisco T1 and E1 inverse multiplexing for ATM (IMA) network modules to your network. It contains the following sections:
IMA Network Modules
This section provides information about the following network modules:
•4-port T1 IMA network module (NM-4T1-IMA) (see Figure 1)
•8-port T1 IMA network module (NM-8T1-IMA) (see Figure 2)
•4-port E1 IMA network module (NM-4E1-IMA) (see Figure 3)
•8-port E1 IMA network module (NM-8E1-IMA) (see Figure 4)
Each port provides 1.544 Mbps/2.048 Mbps connectivity. The IMA aggregation of multiple T1/E1 links increases bandwidth inexpensively to allow WAN uplinks at speeds ranging up to those of a T3/E3 link.
Figure 1 4-Channel IMA T1 Network Module
Figure 2 8-Channel IMA T1 Network Module
Figure 3 4-Channel IMA E1 Network Module
Figure 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 5.)
Figure 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 6 and described in Table 1.
Figure 6 T1/E1 IMA Network Module LEDs
Table 1 T1/E1 IMA Network Module LEDs
LED Color Meaning
Alarm indicating loss of signal, loss of frame, or unavailability because of excessive errors.
Controller local loopback.
Carrier received on telco link.
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
Cisco IOS software website and reference documentation
Cisco IOS Software http://www.cisco.com/web/psa/products/index.html?c=268438303
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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:
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