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network planner integrate the routing requirements of the branch

with as many as four Ethernet segments and integrate the dial

requirements with the synch/asynch module as well as the ISDN

dial-in capability. All in a single chassis!

NM-4T Network Module Overview

A four-port serial network module is now available for the Cisco

3600 series. With this newest addition to the portfolio of existing

serial modules, customers can choose just the right conﬁguration

at the right price for their speciﬁc applications.

The NM-4T, a four-port serial network module, has four

synchronous serial interfaces. The NM-4T network module

requires only a single slot in a Cisco 3600 series router. The

network module supports a total throughput of 8 Mbps full duplex

across all four ports. However, as indicated in Table 3, if only a

single port is utilized, the throughput on that port can reach up to

8 Mbps full duplex. Other combinations are also listed.

NM-4T Applications/Benefits

The new module provides cost-effective solutions for any

environment, delivers very low price per port, and provides higher

performance than comparable solutions from competitors. A

typical example where the new module can be very useful is in the

case of small- to medium-size ISPs with high serial density

requirements. These ISPs can lower cost per port and cost per

subscriber by using a Cisco 3640 with dual four-port serial

network modules and a two-port Channelized T1 network module

for ISDN PRI dial applications.

Table 3

Number of Connected

Ports on NM-4T

Throughput per Port

(Full Duplex)

One 8 Mbps

Two 4 Mbps

Four 2 Mbps

Orderability, Availability, Software

Requirements, Memory Requirements

Tables 4 and 5 give information regarding orderability and

memory requirements of the new modules.

Please see Product Bulletin #545 for more details on the

memory requirements.

Supported Configurations

Table 6 gives conﬁgurations supported by the new modules.

Table 4

Module Orderability Availability

Cisco IOS

Version

NM-16A,

NM-32A

June 30, 1997 July 18, 1997 11.2.(7)P

NM-1FE-TX Orderable now Available now 11.2.(6)P

NM-COMPR June 30, 1997 July 15, 1997 11.2.(7)P

NM-4E Orderable now Available now 11.2.(6)P

NM-4T Orderable now Open 11.2.(5)P

Table 5 Memory Requirements for New Modules

Module Main Memory I/O Memory

NM-16A 300 KB 140 KB

NM-32A 600 KB 270 KB

NM-1FE-TX 0.1 MB 0.3 MB

NM-COMPR 30 KB 780 KB

NM- 4E 0.1 MB 0.6 MB

NM-4T 0.1 MB 0.2 MB

Table 6

Module

Maximum Quantity

in Cisco 3640

Maximum Quantity

in Cisco 3620

NM-16A 3 1

NM-32A 3 1

NM-1FE-TX 4 2

NM-COMPR 1 1

NM-4E 3 2

NM-4T 3 1

1 2 3 4 5 6 7

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