Cisco ISR 4000 Router Modules & Cards

Source Cisco ISR 4000 expansion modules and cards when an installed router needs a specific interface or service, not a full chassis replacement. Compare NIM, service module, PVDM, cellular, DSL, serial, Ethernet switch, SSD, adapter, and transceiver requirements by slot size, supported platform, IOS XE release, power budget, license impact, spare availability, and migration risk.

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  • NIM-16A NIM-16A

    NIM-16A

    Original price was: $3,567.54.Current price is: $1,187.10. Condition: New Factory Sealed

    16x RS-232 Async Ports – Single-Wide NIM

  • NIM-1T NIM-1T

    NIM-1T

    Original price was: $743.24.Current price is: $385.20. Condition: New Factory Sealed

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

  • NIM-24A NIM-24A

    NIM-24A

    Original price was: $5,351.32.Current price is: $1,370.70. Condition: New Factory Sealed

    24x RS-232 Async Ports – Single-Wide NIM

  • NIM-2FXO NIM-2FXO

    NIM-2FXO

    Original price was: $1,404.37.Current price is: $227.70. Condition: New Factory Sealed

    2-Port FXO Voice – Analog NIM – Cisco 4000 ISR

  • NIM-2FXS

    NIM-2FXS

    Original price was: $575.00.Current price is: $223.20. Condition: New Factory Sealed

    2-Port FXS Voice – Analog NIM – Cisco 4000 ISR

  • NIM-2FXS/4FXO NIM-2FXS/4FXO

    NIM-2FXS/4FXO

    Original price was: $1,610.00.Current price is: $582.30. Condition: New Factory Sealed

    2-Port FXS + 4-Port FXO Voice Module – NIM

  • NIM-2FXSP

    NIM-2FXSP

    Original price was: $1,935.93.Current price is: $391.50. Condition: New Factory Sealed

    2-Port FXS Voice – P-Version Analog NIM – Cisco ISR

  • NIM-2T NIM-2T

    NIM-2T

    Original price was: $1,114.86.Current price is: $718.20. Condition: New Factory Sealed

    2-Port Serial WAN – Smart Serial NIM – 8 Mbps

  • NIM-4FXO

    NIM-4FXO

    Original price was: $2,808.75.Current price is: $414.90. Condition: New Factory Sealed

    4-Port FXO Voice – Analog NIM – Cisco 4000 ISR

  • NIM-4FXS

    NIM-4FXS

    Original price was: $1,150.00.Current price is: $414.90. Condition: New Factory Sealed

    4-Port FXS Voice – Analog NIM – Cisco 4000 ISR

  • NIM-4FXSP NIM-4FXSP

    NIM-4FXSP

    Original price was: $3,871.86.Current price is: $1,177.20. Condition: New Factory Sealed

    4-Port FXS Voice – P-Version Analog NIM – Cisco ISR

  • NIM-4T

    NIM-4T

    Original price was: $4,831.06.Current price is: $897.30. Condition: New Factory Sealed

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

Questions & Answers

Q: What are Cisco ISR 4000 Router Modules & Cards used for?
A:

Cisco ISR 4000 Router Modules & Cards add WAN, LAN switching, voice, serial, DSL, cellular, storage, and service capabilities to supported ISR 4000 routers. They are used for branch expansion, replacement, migration, and installed-base support.

Q: How do I choose the right ISR 4000 module or card?
A:

Choose by matching the router model, slot type, NIM or SM form factor, interface requirement, software release, license, power, and service role. The exact module SKU should be validated against the exact ISR 4000 platform.

Q: What is the difference between NIM and SM modules on ISR 4000?
A:

NIMs are Network Interface Modules used for WAN, LAN, voice, serial, DSL, and other interfaces, while SM or SM-X service modules provide larger service or switching expansion. Slot availability differs across ISR 4000 models.

Q: Can ISR 4000 routers use adapters for NIM modules?
A:

Some ISR 4000 service module slots can use adapter or carrier cards to support NIM modules. Buyers should confirm adapter compatibility, supported NIM type, slot placement, software release, and power requirements before ordering.

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Cisco ISR 4000 Voice NIM Modules and Cards

Cisco ISR 4000 voice NIM modules are used to add analog voice interfaces to supported Cisco 4000 Series Integrated Services Routers. These modules are commonly used for branch voice gateways, analog phones, fax machines, PBX connections, PSTN backup lines, DID services, and small office voice deployments.

This category focuses on Cisco ISR 4000 analog voice NIM options, including FXO, FXS, FXS/DID, and combo FXS + FXO modules. Before choosing a module, confirm the router model, available NIM slot, IOS XE version, voice license package, number of analog ports, PSTN or endpoint connection type, and whether the design requires FXO, FXS, DID, or a mixed voice interface.

Quick Selection Guide

Requirement Recommended Product Typical Use
Connect 2 analog PSTN or PBX lines NIM-2FXO 2-port FXO voice NIM for analog carrier lines, PBX, or PSTN connections
Connect 4 analog PSTN or PBX lines NIM-4FXO 4-port FXO voice NIM for higher-density analog trunk connections
Connect 2 analog phones, fax machines, or FXS endpoints NIM-2FXS 2-port FXS voice NIM for analog endpoints and fax devices
Connect 4 analog phones, fax machines, or FXS endpoints NIM-4FXS 4-port FXS voice NIM for branch analog endpoint expansion
Use one module for both analog endpoints and PSTN lines NIM-2FXS/4FXO Combo 2-port FXS + 4-port FXO voice module for mixed branch voice needs
Use newer P-version 2-port FXS hardware NIM-2FXSP 2-port FXS P-version voice NIM with the same functional role as NIM-2FXS
Use newer P-version 4-port FXS hardware NIM-4FXSP 4-port FXS P-version voice NIM with the same functional role as NIM-4FXS

How to Choose ISR 4000 Voice NIM Modules

Choose FXO NIMs for PSTN, PBX, and Carrier Analog Lines

FXO ports are used when the router needs to connect to external analog phone lines, PBX trunks, key systems, or PSTN services. Choose a 2-port FXO module for smaller sites and a 4-port FXO module when the branch needs more analog trunk capacity. FXO is the correct direction when the router receives analog service from the outside line.

Choose FXS NIMs for Analog Phones and Fax Machines

FXS ports are used when the router needs to connect directly to analog endpoints such as phones, fax machines, modems, or other analog voice devices. Choose a 2-port FXS module for small endpoint counts and a 4-port FXS module when the branch needs more analog device ports. FXS is the correct direction when the router provides the analog phone port to the endpoint.

Choose Combo FXS + FXO NIMs for Mixed Branch Voice

For branch offices that need both analog endpoints and analog PSTN lines in one module, choose a combo FXS + FXO voice NIM. This is useful when a site needs to connect local phones or fax devices while also keeping analog PSTN lines for backup, survivability, or local calling.

Understand P-Version FXS Modules

P-version FXS modules are newer hardware versions created because of component changes in the manufacturing process. They serve the same functional role as the corresponding non-P FXS modules. Use the P-version when it is the available replacement SKU or when the router software release and platform support match the deployment requirement.

FXO vs FXS: Which One Do You Need?

Interface Type Connects To Common Use Case
FXO Analog PSTN line, PBX, or carrier-provided phone line Connecting the router to external analog voice service
FXS Analog phone, fax machine, modem, or endpoint device Providing analog phone ports from the router to local devices
FXS + FXO Combo Both analog endpoints and external analog lines Small branch voice gateway with mixed analog requirements

Voice Module Selection Notes

  • Choose FXO when the router connects to an outside analog phone line or PBX trunk.
  • Choose FXS when the router connects directly to an analog phone, fax machine, or endpoint.
  • Choose a combo FXS + FXO module when the branch needs both endpoint ports and PSTN line ports.
  • Confirm the Cisco ISR 4000 router model and available NIM slot before ordering.
  • Confirm IOS XE release support and required voice feature package before deployment.
  • Do not confuse analog voice NIMs with PVDM modules. These analog voice NIMs include onboard DSP for analog voice services.
  • For conferencing, transcoding, or higher-density DSP resources, a separate PVDM design may still be required depending on the voice architecture.

Common Buying Mistakes

  • Buying FXS when the project needs FXO for PSTN or PBX lines.
  • Buying FXO when the project needs FXS ports for analog phones or fax machines.
  • Assuming a PVDM module can replace an analog FXS or FXO interface card.
  • Forgetting to check whether the router has an available NIM slot.
  • Ignoring IOS XE and voice license requirements for Cisco ISR 4000 voice deployments.
  • Choosing too few ports for future analog phone, fax, or PSTN expansion.
  • Mixing ISR 4000 voice NIMs with older ISR G2 VIC/VIC2 modules without checking compatibility.

Before You Order

To choose the correct ISR 4000 voice NIM, prepare the router model, IOS XE version, available NIM slot, number of required analog ports, voice license status, PSTN or PBX connection type, endpoint count, fax requirement, and whether the deployment needs FXO, FXS, DID, or a mixed FXS + FXO configuration.