NIM-1T – 1-Port Serial WAN – Smart Serial NIM – 8 Mbps

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NIM-1T Description

The NIM-1T is a Cisco 1-port synchronous serial WAN Network Interface Module for Cisco 4400 Series ISR branch routers that terminate a leased-line circuit. The module has one Smart Serial connector that runs up to 8 Mbps with HDLC, PPP or Frame Relay encapsulation over V.35, EIA-232, EIA-449, EIA-530, EIA-530A and X.21 cables. The module is a single-wide NIM with no slot restrictions, needs Cisco IOS XE 3.12 or later with the IP Base feature set, and does not support Bisync or X.25.

Quick Specs

Parameter

Specification

Product ID

NIM-1T

Cisco ordering description

1-Port Serial WAN Interface Card

Interface role

Synchronous serial WAN connectivity

Connector type

Smart Serial / 12-in-1

Connector count

1

Ports per connector

1

Maximum data rate per port

8 Mbps

Supported interfaces

V.35, RS-232, X.21, EIA/TIA-449, EIA-530, and EIA-530A

Supported encapsulations

HDLC, PPP, and Frame Relay

4400 series software baseline

Cisco IOS XE Release 3.12S or later with IP Base feature set

Physical form factor

Single-wide NIM with no slot restrictions

Application Scenarios

Leased-Line Handoff At A Branch

A branch router such as the Cisco 4451-X terminates one synchronous serial leased line from its carrier on the module’s Smart Serial port, running HDLC or PPP at up to 8 Mbps.

Frame Relay Or X.21 Circuits

A site that still runs Frame Relay, or an X.21 or V.35 line from an older provider, connects through the module with a Smart Serial cable matched to the circuit’s electrical standard.

Product Comparison

Parameter

NIM-1T

NIM-2T

NIM-4T

Connector type

Smart Serial / 12-in-1

Smart Serial / 12-in-1

Smart Serial / 12-in-1

Connector count

1

2

4

Maximum data rate per port

8 Mbps

8 Mbps

8 Mbps

Supported interfaces

V.35, RS-232, X.21, EIA/TIA-449, EIA-530, and EIA-530A

V.35, RS-232, X.21, EIA/TIA-449, EIA-530, and EIA-530A

V.35, RS-232, X.21, EIA/TIA-449, EIA-530, and EIA-530A

Physical form factor

Single-wide NIM with no slot restrictions

Single-wide NIM with no slot restrictions

Single-wide NIM with no slot restrictions

Supported platform quantity in datasheet

Up to 3 modules on Cisco 4451-X

Up to 3 modules on Cisco 4451-X

Up to 3 modules on Cisco 4451-X

NIM-1T is the single-port model of this Smart Serial NIM group: it has one serial connector against two on NIM-2T and four on NIM-4T, while all three run at up to 8 Mbps per port, so port count is the only hardware difference. A branch with two synchronous serial circuits on one router moves to NIM-2T, and a branch with four moves to NIM-4T. Cisco’s datasheet allows up to 3 of each module on a Cisco 4451-X, which caps one router at 3 serial ports with NIM-1T, 6 with NIM-2T and 12 with NIM-4T.

Ordering Checklist

  • Supported hosts: Install the module in a Cisco 4451-X, where the datasheet allows up to 3 NIM-1T modules. The module installs only in a supported Cisco 4000 Series ISR NIM slot.

Specifications

Parameter Specification Parameter Specification
Product ID NIM-1T Product type Synchronous serial WAN NIM
Cisco ordering description 1-Port Serial WAN Interface Card Connector type Smart Serial / 12-in-1
Connector count 1 Ports per connector 1
Maximum data rate per port 8 Mbps Supported interfaces V.35, RS-232, X.21, EIA/TIA-449, EIA-530, and EIA-530A
Supported encapsulations HDLC, PPP, and Frame Relay Synchronous support Yes
4400 series software baseline Cisco IOS XE Release 3.12S or later Feature set baseline IP Base feature set
Physical form factor Singlewide NI, no slot restrictions Supported platform quantity in datasheet Up to 3 modules on Cisco 4451-X
Clock rate range 1200 to 8000000 bps for DCE interfaces Default MTU 1500 bytes
MTU range 64 to 8100 bytes Half duplex support Not supported
Dimensions 1.25 x 3.50 x 7.24 in. (3.18 x 8.89 x 18.39 cm) Operating temperature 0°C to 40°C (32°F to 104°F)
Storage temperature -20°C to 65°C (-4°F to 149°F) Operating humidity 10 to 90 percent, noncondensing

Quality Certifications

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    Followed up with a thank-you when our project went live. Received a genuine response.

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    Emailed a question at 9 PM, had an answer by morning.

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    Posted on 14/01/2026
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    Second order this quarter. Layer23 is our go-to now.

Questions & Answers

  • Which routers accept NIM-1T?

    NIM-1T installs in a supported Cisco 4000 Series ISR NIM slot, and the datasheet allows up to 3 modules in a Cisco 4451-X. The single-wide module has no slot restrictions, so any free NIM slot in a supported router takes it.
  • What minimum software release does NIM-1T need?

    NIM-1T needs Cisco IOS XE Release 3.12S or later on a Cisco 4400 Series ISR, with the IP Base feature set. The module runs HDLC, PPP or Frame Relay encapsulation and does not support Bisync or X.25.
  • Is NIM-1T listed in the Catalyst 8300 datasheet?

    Yes. Table 7 of the Catalyst 8300 datasheet lists NIM-1T among the serial NIMs, together with the multiflex T1/E1 and channelized E1/T1 PRI NIMs. Check that module table to confirm the Catalyst 8300 model before ordering the one-port serial module for a new platform.
  • What clock rate range does NIM-1T support on a DCE interface?

    NIM-1T supports clock rates from 1200 to 8000000 bps on DCE interfaces. The 8 Mbps maximum data rate per port is the top of that range. Set the clock rate within it when the router supplies timing to the attached device on the leased line.
  • What MTU values can be set on NIM-1T?

    The default MTU on NIM-1T is 1500 bytes and the configurable range is 64 to 8100 bytes. Half duplex is not supported. Adjust the MTU only where the leased-line peer is configured to match, so frames of the larger size pass end to end.
  • What operating environment does NIM-1T require?

    NIM-1T operates from 0°C to 40°C (32°F to 104°F) at 10 to 90 percent humidity, noncondensing. Storage is rated -20°C to 65°C. Keep the branch router closet inside that operating range when the serial circuit terminates in a plant room.

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DataSheet Downloads

  • NIM-1T Datasheet