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NM-COMPR Network Module Overview

The new compression network module dramatically raises the

compression bandwidth of the Cisco 3600 series by off-loading

the intensive processing that compression requires from the main

CPU. It accomplishes this scenario with a dedicated, optimized

coprocessor design that supports full-duplex compression and

decompression. The compression is at the link layer or Layer 2

and is supported for PPP. Frame Relay support will be added

in the near future.

Low-speed WAN compression can often be supported by the

Cisco IOS software executing on the main Cisco 3600 series

CPU. For the Cisco 3620, this bandwidth is well below T1/E1

rates and for the Cisco 3640, it approaches T1 rates. However,

these rates cannot be achieved if the Cisco 3600 system has other

processor-intensive tasks to execute as well. The compression

network module off-loads the main CPU so that it can handle

other tasks while raising the compression bandwidth on both the

Cisco 3620 and the Cisco 3640 to 2 E1 full duplex (2 x 2.048

Mbps full duplex). This bandwidth can be utilized for a single

channel or circuit or spread across as many as 128. Examples

range from an E1 or T1 leased line to 128 ISDN B channels or

Frame Relay virtual circuits.

NM-COMPR Applications/Benefits

The compression network module provides signiﬁcant beneﬁts to

both LAN-to-LAN WAN links and ISDN dialup links. It is not

used for async/modem links because the compression is better left

to the modems. Compression is particularly attractive where

higher-speed WAN services are unavailable or expensive or when

increased throughput can beneﬁt user productivity and

satisfaction. The basic beneﬁts of compression include:

• Increased bandwidth over a link to avoid the expense

of additional or higher-speed links

• Decreased amount (and, therefore, expense) of trafﬁc on a link

when tarifﬁng is usage based

• Improved response time for higher productivity and satisfaction

In LAN-to-LAN use, the NM-COMPR can increase the

bandwidth and reduce the cost of high-speed T1/E1 links between

branch and regional or central ofﬁces. For ISDN dialup

applications, the NM-COMPR has sufﬁcient memory to support

more than four E1 ISDN PRI connections (more than 120 B

channels) and push throughput over the 64-kbps B channels closer

to the performance that users experience when connected directly

to the corporate LAN.

In combination with software-based compression

on low-end routers (Cisco 77X, 1600, and 2500 series),

compression service adapters for the Cisco 7200 and 7500 series

routers at the core (with up to eight E1 full-duplex bandwidth) of

the NM-COMPR give Cisco customers a complete end-to-end

compression solution.

NM-4E Network Module Overview

A four-port Ethernet network module is now available for the

Cisco 3600 series. With the various options now available for

Ethernet connectivity on a Cisco 3640 and a Cisco 3620,

the Cisco 3600 router beats any other competitive solution

handily with industry-leading price/performance, and density for

ISDN or synchronous/asynchronous serial lines with Ethernet

connections at the back end. This solution complements the

already existing options listed in Table 2.

NM-4E Applications/Benefits

Whereas the mixed-media network modules allow you to

conﬁgure an Ethernet port with additional WAN connections on

the same module for your present or future needs, the four-port

Ethernet network module gives a lower price point for speciﬁc

system solutions that require higher-density Ethernet but with no

WAN interface card slots.

A typical example would be the use of a Cisco 3640 with a

four-port Ethernet network module, a 16-port BRI, and a 32-port

asynchronous serial network module. This conﬁguration lets the

Table 2 Ethernet Options on the Cisco 3600

LAN Ports on Module

WAN Interface Card Slots

on Module

Single-Port Ethernet None

Four-Port Ethernet None

Single-Port Ethernet Mixed Media Two WAN interface card slots

Dual-Port Ethernet Mixed Media Two WAN interface card slots

Single-Port Ethernet and Single-Port

Token Ring Mixed Media

Two WAN interface card slots

Single-Port Fast Ethernet None

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