"Table 1.Cisco T1/E1 NIM Types and Feature Comparison

Part Number

Number of Ports

Clear-Channel Data

MFT Packet Voice

Unstructured E1 (G.703) Support

Channelized Data

NIM-1MFT-T1/E1

1

Yes

Yes

No

No

NIM-2MFT-T1/E1

2

Yes

Yes

No

No

NIM-4MFT-T1/E1

4

Yes

Yes

No

No

NIM-8MFT-T1/E1

8

Yes

Yes

No

No

NIM-1CE1T1-PRI

1

Yes

Yes

Yes

Yes

NIM-2CE1T1-PRI

2

Yes

Yes

Yes

Yes

NIM-8CE1T1-PRI

8

Yes

Yes

Yes

Yes

You can insert the Cisco T1/E1 NIMs into the NIM slot on the supported Cisco 4000 Integrated Services Routers (ISRs). In addition to the features listed in Table 1, these modules support both T1 and E1, providing additional flexibility for supporting T1, fractional T1, E1, and fractional E1 for both voice and WAN applications simultaneously. All modules include the drop-and-insert multiplexing capability, which eliminates costly external third-party channel service units/data service units (CSUs/DSUs) and drop-and-insert multiplexers.

The fourth-generation Cisco T1/E1 NIMs add improvements over the Cisco Second- and Third-Generation T1/E1 Multiflex Trunk Voice and WAN Interface Cards (MFT VWIC2s and VWIC3s, respectively). The fourth-generation T1/E1 modules enable each port to be clocked from an independent clock source for data applications. Voice applications can now be clocked independently from data applications, with all ports for voice applications clocked from a single source.

The T1/E1 modules contain an onboard Cisco Packet Voice Digital Signal Processor Module 4 (PVDM4) slot, which requires a fourth-generation PVDM4 module. A PVDM4 on the T1/E1 module is necessary for the voice features. The PVDM4 also provides for echo cancellation of up to 128-ms echo-tail length for demanding network conditions. Refer to Table 2 for all configuration options offered with the modules.

These fourth-generation modules also provide increased port density per chassis compared to the Cisco Integrated Services Routers Generation 2 (ISR G2) platform.

Key Features

●Basic T1/E1 data: The MFT versions act as WICs, supporting T1, fractional T1, E1, and fractional E1. To simplify remote management, these modules integrate a fully managed DSU/CSU for T1 deployments and a fully managed DSU for E1 deployments.

●E1/G.703 data: In addition to the basic T1/E1 data support, the CE1T1 versions also support structured G.703 with G.704 framing and unstructured E1 (G.703) applications.

●T1/E1 packet voice: All the modules support packet voice applications by providing T1, fractional T1, E1, and fractional E1 connections to private branch exchanges (PBXs) and central offices, thereby enabling new services and reducing voice and fax toll charges. An additional onboard PVDM4 is required. Also, each NIM has its own PVDM4, so each module can be connected to a different service provider with no single clock domain restriction.

●Mixed data and packet voice: All the modules can simultaneously support both data and voice, reducing the complexity and number of network components and facilitating a graceful migration to bandwidth-efficient packet voice.

●Mixed data and packet voice with drop and insert: You can deploy all the modules as T1/E1 drop-and-insert multiplexers withintegrated DSUs/CSUs, reducing the complexity of the network and the cost of the central-office ports by efficiently combining time-division multiplexing (TDM) voice (PBX), IP voice, and data on the same trunks.

Applications

Packet Voice Solutions: PBX and Central-Office Connectivity

The modules supply PBX and public-switched-telephone-network (PSTN) connectivity for the Cisco 4000 with the onboard NIM slots. The ISRs support H.323, Session Initiation Protocol (SIP), Media Gateway Control Protocol (MGCP), and Skinny Client Control Protocol (SCCP)-based voice over IP (VoIP).

Multiplexed Data and Voice Solutions: T1/E1 Drop-and-Insert Multiplexer with Integrated DSU/CSU

The Cisco fourth-generation T1/E1 modules simplify branch-office connectivity by consolidating the functions of a router, a fully managed drop-and-insert multiplexer, and a fully managed DSU/CSU into a single box. Typically a drop-and-insert multiplexer is used for channelized (that is, TDM) integration of data and voice onto a single T1, fractional T1, E1, or fractional E1 connection to the central office. Sharinga line can significantly reduce costs over those of two separate physical lines to the central office. Although the normal use is for data andvoice sharing of a T1 or E1 service, you can also use the drop-and-insert capability for voice and data, or data and data sharing of the service. Moreover, the integrated drop-and-insert capability enhances system availability by allowing the Cisco IOS®Software to be reloaded while maintaining TDM switching. 56/64K Digital Data Service (DDS) function is not supported by T1/E1 NIMs.

Analog Cross-Connect Solution

You can cross-connect the TDM DS-0 channels with analog voice ports to create an analog cross-connect solution."