NIM-2FXS – 2-Port FXS Voice – Analog NIM – Cisco 4000 ISR
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NIM-2FXS Description
NIM-2FXS is a Cisco 4000 Series ISR Network Interface Module that adds two FXS analog voice ports for station-side connections from a router NIM slot to analog phones, fax machines, or key systems. It is used in branch voice deployments that need analog endpoint support on Cisco 4300 or 4400 Series ISR platforms, with Cisco-documented IOS XE release support, a minimum Unified Communications technology package requirement, onboard DSP for the voice NIM family, straight-through 2-wire cabling for FXS/FXO port connections, and OIR support in Cisco 4000 Series ISR NIM slots when managed insertion or removal is not performed during active calls.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
NIM-2FXS |
|
Product type |
2-port FXS Network Interface Module |
|
Cisco ordering description |
2-Port Network Interface Module – FXS, FXS-E and DID |
|
Port count |
2 FXS voice ports |
|
Analog interface role |
Foreign Exchange Station station-side analog interface |
|
ISR G2 comparison |
VIC3-2FXS/DID |
|
Supported router context |
Cisco 4000 Series ISR NIM slots; Cisco 4300 and 4400 Series support context |
|
Cisco IOS XE release for this SKU |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
|
Voice package requirement |
Minimum Unified Communications technology package for voice applications |
|
DSP design |
Onboard DSP on the voice NIM; no dedicated motherboard PVDM required for this voice module family |
|
OIR support |
Supported in Cisco 4000 Series ISR NIM slots; managed OIR requires no active calls |
|
Weight |
0.42 lb (191 g) |
Application Scenarios
Select NIM-2FXS when a Cisco 4000 Series ISR voice gateway needs two analog station-side ports for endpoints such as phones, fax machines, or key systems.
Keep this SKU in the bill when the replacement path is tied to the VIC3-2FXS/DID role and the site does not need the four-port FXS density of NIM-4FXS.
Use the two-port FXS module when FXS service is needed without the FXO trunk capacity of NIM-2FXS/4FXO, and verify the router slot and software baseline before hardware approval.
Product Comparison
|
Parameter |
NIM-2FXS | ||
|---|---|---|---|
|
Cisco ordering description |
2-Port Network Interface Module – FXS, FXS-E and DID |
4-Port Network Interface Module – FXS, FXS-E and DID |
2-port Network Interface Module – FXO (Universal) |
|
Product type |
FXS analog voice Network Interface Module |
FXS analog voice Network Interface Module |
FXO analog voice Network Interface Module |
|
Port count |
2 FXS ports |
4 FXS ports |
2 FXO ports |
|
Primary interface role |
Station-side analog voice or DID-mode service |
Station-side analog voice or DID-mode service |
Line-side FXO analog voice |
|
ISR G2 comparison |
VIC3-2FXS/DID |
VIC3-4FXS/DID |
VIC2-2FXO |
|
Cisco IOS XE release for this SKU |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
|
DSP note |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
|
Weight |
0.42 lb (191 g) |
0.44 lb (200 g) |
0.42 lb (191 g) |
|
OIR or hot-swap support |
Supported in Cisco 4000 Series ISR NIM slots |
Supported in Cisco 4000 Series ISR NIM slots |
Supported in Cisco 4000 Series ISR NIM slots |
- In a NIM-2FXS vs NIM-4FXS comparison, the main difference is FXS port count: NIM-2FXS provides two FXS ports, while NIM-4FXS provides four FXS ports.
- The NIM-2FXS difference from NIM-2FXS/4FXO is interface mix. NIM-2FXS stays with two FXS-class ports, while NIM-2FXS/4FXO adds four FXO ports in the same analog voice NIM family.
- For buyers comparing NIM-2FXS vs NIM-2FXO, the important comparison point is interface direction: NIM-2FXS is for station-side analog endpoints or DID-mode planning, while NIM-2FXO is for line-side FXO trunk service.
- Which model to choose depends on whether the bill requires two FXS ports, four FXS ports, mixed FXS/FXO service, or FXO-only trunk connectivity.
Selection Guide
1. Choose it for two FXS analog ports
Select NIM-2FXS when the Cisco 4000 Series ISR bill calls for two FXS station-side ports and does not require FXO trunk ports on the same NIM.
2. Move to NIM-4FXS for four FXS ports
Choose NIM-4FXS when the deployment keeps the same FXS role but needs four analog station-side ports instead of two.
3. Move to NIM-2FXS/4FXO for mixed analog voice
Select NIM-2FXS/4FXO when the same module must combine FXS/FXS-E/DID service with four FXO ports.
4. Verify software and telephony details
Confirm the IOS XE release row, Unified Communications technology package scope, FXS or DID signaling plan, locale tone setting, and 2-wire cable path before the quote is finalized.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact product ID |
NIM-2FXS |
Separates the two-port FXS NIM from NIM-4FXS, NIM-2FXS/4FXO, and FXO-only modules |
|
Interface role |
FXS station-side service or DID-mode use |
Prevents ordering an FXS module for an FXO trunk requirement |
|
Router slot plan |
Cisco 4000 Series ISR NIM placement or Cisco-documented NIM carrier-card placement |
Keeps the analog voice module inside the platform context Cisco documents |
|
Software baseline |
Cisco IOS XE release row for NIM-2FXS and the Unified Communications technology package |
Aligns the module with Cisco voice-application requirements |
|
Telephony setup |
Locale call-progress tones and the planned FXS or DID signaling behavior |
Reduces turn-up changes when analog endpoint or central-office behavior is already known |
|
Cabling |
Straight-through 2-wire cable for NIM FXS and FXO port connections |
Follows Cisco cabling guidance for analog NIM ports |
|
OIR timing |
No active calls before managed OIR work |
Cisco documents managed OIR restrictions for fourth-generation voice and fax NIMs |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | NIM-2FXS | Product type | FXS analog voice Network Interface Module |
| Cisco ordering description | 2-Port Network Interface Module – FXS, FXS-E and DID | Port count | 2 FXS voice ports |
| Analog interface role | Foreign Exchange Station station-side analog interface | ISR G2 comparison | VIC3-2FXS/DID |
| Supported router family | Cisco 4000 Series Integrated Services Routers | Documented ISR series context | Cisco 4300 and 4400 Series ISRs |
| Unsupported ISR family | Not supported with Cisco 2900 and 3900 Series ISRs | Cisco IOS XE release for this SKU | XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
| Voice package requirement | Minimum Unified Communications technology package for voice applications | DSP design | Onboard DSP on the voice NIM family |
| Motherboard PVDM requirement | No dedicated packet voice DSP module required on the router motherboard for this voice NIM family | Voice-port configuration form | voice-port slot/subunit/subslot |
| FXS endpoint connection role | Direct connection to phones, fax machines, and key systems | DID connection role | Off-premises DID connection from the central office for incoming PSTN calls |
| FXS feature notes | Battery polarity reversal, caller ID, configurable long loop ports, message waiting indicator, and cable detection | DID caller ID note | DID mode does not support caller ID |
| FXS signaling options | groundStart or loopStart under voice-port configuration | Call progress tone setting | cptone locale under voice-port configuration |
| OIR support | FXS, FXO, E/M, and BRI NIMs can be inserted into supported Cisco 4000 Series ISR NIM slots without powering off the router | Managed OIR restriction | Managed OIR is not supported with active calls |
| Cabling note | Straight-through 2-wire cable for NIM FXS and FXO port connections | Network management | Remote and local configuration, monitoring, and troubleshooting from Cisco IOS XE Software CLI |
| Analog NIM jumper note | No jumpers to set on NIM analog modules | Weight | 0.42 lb (191 g) |
Get More Information
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Customer Reviews
Questions & Answers
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What does NIM-2FXS add to a router?
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How is NIM-2FXS different from NIM-2FXO?
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When is NIM-2FXS still used?
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What power behavior matters for NIM-2FXS?
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Does NIM-2FXS support fax workflows?
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Which platform checks apply to NIM-2FXS?
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Why does NIM-2FXS have no dial tone?
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Can NIM-2FXS replace analog trunks?
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