NIM-4T – 4-Port Serial WAN – Smart Serial NIM – 8 Mbps

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NIM-4T Description

The NIM-4T is a Cisco 4-port synchronous serial WAN network interface module for Cisco 4000 Series ISRs that terminate legacy serial circuits. The module has four Smart Serial ports at up to 8 Mbps each and supports EIA-232, EIA-449, EIA-530, EIA-530A, V.35 and X.21 interfaces with HDLC, PPP and Frame Relay, in a single-wide NIM with no slot restrictions. Bisync and X.25 are not supported, and the module needs Cisco IOS XE 3.12 or later with the IP Base feature set.

Quick Specs

Parameter

Specification

Product ID

NIM-4T

Product type

4-port synchronous serial WAN NIM

Cisco ordering description

4-Port Serial WAN Interface Card

Interface role

Synchronous serial WAN connectivity

Connector type

Smart Serial / 12-in-1

Connector count

4

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

Branch Serial Circuit Aggregation

A branch router with four legacy synchronous serial circuits, such as V.35 or X.21 carrier handoffs, can terminate all four on the module’s Smart Serial ports at up to 8 Mbps each from one NIM slot.

Frame Relay And HDLC WAN Links

A WAN edge that still runs Frame Relay, HDLC or PPP over serial links can carry those protocols on the module, with DCE clock rates from 1200 bps to 8 Mbps.

Product Comparison

Parameter

NIM-4T

NIM-2T

NIM-1T

Serial ports

4

2

1

Connector type

Cisco Smart Serial

Cisco Smart Serial

Cisco Smart Serial

Maximum data rate per port

8 Mbps

8 Mbps

8 Mbps

Supported interfaces

EIA-232, EIA-449, EIA-530, EIA-530A, V.35, X.21

EIA-232, EIA-449, EIA-530, EIA-530A, V.35, X.21

EIA-232, EIA-449, EIA-530, EIA-530A, V.35, X.21

Platform quantity

Up to 3 modules on Cisco 4451-X

Up to 3 modules on Cisco 4451-X

Up to 3 modules on Cisco 4451-X

Cisco IOS XE release

3.12 or later with IP Base feature set

3.12 or later with IP Base feature set

3.12 or later with IP Base feature set

NIM-4T, NIM-2T and NIM-1T share the same Smart Serial connector, the same 8 Mbps maximum per port and the same V.35, RS-232, X.21, EIA/TIA-449, EIA-530 and EIA-530A interface support, so the port count is the only thing that separates them. NIM-4T provides four serial circuits in one NIM slot. A branch with two circuits can order NIM-2T, and a branch with a single circuit can order NIM-1T. Each module needs its own slot, so a router that must terminate more circuits than one NIM slot allows has to use NIM-4T to keep the other slots free.

Ordering Checklist

  • Router hosts: Order for Cisco 4000 Series ISR NIM slots, such as the Cisco 4451-X named in the data sheet. Check the target router against the compatibility page, which marks NIM-4T as unsupported on one 4000 Series platform.

Specifications

Parameter Specification Parameter Specification
Product ID NIM-4T Product type Synchronous serial WAN NIM
Cisco ordering description 4-Port Serial WAN Interface Card Connector type Smart Serial / 12-in-1
Connector count 4 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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    Sealed box, original hologram intact. No concerns about authenticity.

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    I keep coming back because there’s no reason to look elsewhere.

    Richard Wu
    Posted on 28/02/2026
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    5.0

    I read the reviews before ordering and they were accurate. Trustworthy seller.

Questions & Answers

  • Which routers can NIM-4T be installed in?

    NIM-4T installs in a NIM slot of Cisco 4000 Series ISRs, such as the Cisco 4451-X, where up to 3 modules are supported. The compatibility page marks NIM-4T as unsupported on one 4000 Series platform, so check the target router before ordering.
  • What software does NIM-4T need?

    NIM-4T needs Cisco IOS XE Release 3.12S or later with the IP Base feature set on the 4400 Series. The module is a single-wide NIM with no slot restrictions, and the Cisco data sheet lists Bisync and X.25 as not supported on its Smart Serial ports.
  • Is NIM-4T listed as a supported WAN module for the Catalyst 8300?

    Yes. The Catalyst 8300 data sheet lists the serial NIM-4T among its supported WAN network interface modules. All four Smart Serial ports terminate synchronous leased lines there as they do on a Cisco 4000 Series ISR. Order NIM-4T for a Catalyst 8300 branch edge that ends several serial circuits.
  • What clock rate range can NIM-4T generate on its DCE interfaces?

    NIM-4T generates clock rates from 1200 to 8000000 bps on DCE interfaces. The upper value equals the 8 Mbps maximum data rate per port. Configure the clock rate on each Smart Serial interface that supplies timing, and set it to the speed of the circuit or the attached device.
  • What MTU range does NIM-4T accept, and is half duplex available?

    NIM-4T defaults to an MTU of 1500 bytes and accepts 64 to 8100 bytes. Half duplex is not supported. Treat each serial link as full duplex, and raise the MTU only when the device at the other end of the HDLC, PPP or Frame Relay circuit uses the same frame size.
  • What are the operating and storage temperature limits of NIM-4T?

    NIM-4T operates from 0 to 40 degrees C (32 to 104 degrees F) at 10 to 90 percent noncondensing humidity. Storage is rated from -20 to 65 degrees C (-4 to 149 degrees F). Closets without air conditioning need to stay under the 40 degrees C operating limit for the single-wide module.

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DataSheet Downloads

  • NIM-4T Datasheet