NIM-4FXS – 4-Port FXS Voice – Analog NIM – Cisco 4000 ISR
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NIM-4FXS Description
NIM-4FXS is a Cisco 4000 Series ISR analog voice Network Interface Module that adds four FXS/FXS-E/DID-capable voice ports to a supported ISR NIM slot for station-side phone, fax, key-system, or DID incoming-call service. Cisco identifies the module as a 4-Port Network Interface Module - FXS, FXS-E and DID, with Cisco IOS XE support across XE3.13.4, XE3.14.3, XE3.15.1, and XE3.16 and later releases, a minimum Unified Communications technology package requirement for voice applications, onboard DSP for the voice NIM family, managed OIR support when no active calls are present, straight-through 2-wire cabling for FXS and FXO port connections, and a listed weight of 0.44 lb (200 g).
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
NIM-4FXS |
|
Product type |
4-port FXS Network Interface Module |
|
Cisco ordering description |
4-Port Network Interface Module – FXS, FXS-E and DID |
|
Port count |
4 FXS/FXS-E/DID-capable voice ports |
|
Analog interface role |
Foreign Exchange Station station-side service or DID incoming-call service |
|
ISR G2 comparison |
VIC3-4FXS/DID |
|
Supported router context |
Cisco 4000 Series ISR NIM slots; Cisco 4300 and 4400 Series voice NIM configuration 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 |
0.44 lb (200 g) |
Application Scenarios
Order NIM-4FXS when a Cisco 4000 Series ISR voice gateway needs four station-side analog ports for phones, fax devices, or key systems in one NIM position.
Keep this module in the bill when the site needs four FXS-class ports that may be configured for DID service, with signaling and call-progress tone settings matched to the local telephony plan.
Select NIM-4FXS for four FXS/FXS-E/DID-capable ports when the design does not need the FXO line-side ports included on NIM-2FXS/4FXO.
Product Comparison
|
Parameter |
NIM-4FXS | |||
|---|---|---|---|---|
|
Cisco ordering description |
4-Port Network Interface Module – FXS, FXS-E and DID |
2-Port Network Interface Module – FXS, FXS-E and DID |
4-Port Network Interface Module – FXS, FXS-E and DID |
2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module |
|
Product type |
FXS analog voice Network Interface Module |
FXS analog voice Network Interface Module |
FXS analog voice Network Interface Module |
Combination FXS and FXO analog voice Network Interface Module |
|
P-version status |
Non-P version |
Non-P version |
P version with no functionality change from non-P version |
Non-P version |
|
Port count |
4 FXS/FXS-E/DID-capable ports |
2 FXS/FXS-E/DID-capable ports |
4 FXS/FXS-E/DID-capable ports |
2 FXS/FXS-E/DID-capable ports and 4 FXO ports |
|
Primary interface role |
Station-side FXS service or DID incoming-call service |
Station-side FXS service or DID incoming-call service |
Station-side FXS service or DID incoming-call service |
Mixed station-side FXS/DID and line-side FXO analog voice |
|
ISR G2 comparison |
VIC3-4FXS/DID |
VIC3-2FXS/DID |
VIC3-4FXS/DID |
VIC2-4FXO and VIC3-2FXS/DID |
|
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 |
XE16.5 and above |
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 |
Voice NIM includes onboard DSP |
|
OIR 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 |
Supported in Cisco 4000 Series ISR NIM slots |
- In a NIM-4FXS vs NIM-2FXS comparison, the difference is FXS port count: NIM-4FXS provides four FXS-class positions, while NIM-2FXS provides two.
- The NIM-4FXS difference from NIM-4FXSP is the product line suffix and release row. Cisco documents NIM-4FXSP as a P-version with no functionality change from the non-P version, while NIM-4FXS uses the earlier XE3.13.4-and-above release row listed in the data sheet.
- For a NIM-4FXS vs NIM-2FXS/4FXO comparison, the key interface difference is FXS-only density versus a mixed two-FXS plus four-FXO analog NIM.
- Which model to choose depends on whether the order line needs four FXS-class ports, two FXS-class ports, the exact P-version four-port PID, or a mixed FXS and FXO module.
Selection Guide
1. Match the four-port FXS requirement
Choose NIM-4FXS when the Cisco 4000 Series ISR design needs four FXS/FXS-E/DID-capable ports and no FXO trunks on the same module.
2. Keep NIM-2FXS for smaller station counts
Select NIM-2FXS only when two FXS-class ports are enough and the bill should not add unused analog positions.
3. Compare the P-version line separately
Use NIM-4FXSP only when the BOM specifies the P-version product ID and the software plan matches the XE16.5-and-above row.
4. Move to the combo NIM for FXO trunks
Choose NIM-2FXS/4FXO when the same router slot must include FXO trunk interfaces in addition to FXS/FXS-E/DID-capable ports.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact product ID |
NIM-4FXS |
Separates the four-port FXS NIM from NIM-2FXS, NIM-4FXSP, and mixed FXS/FXO modules |
|
Interface role |
FXS station-side service or DID incoming-call service |
Prevents ordering an FXS-class module for an FXO trunk-only handoff |
|
Router placement |
Cisco 4000 Series ISR NIM slot or Cisco-documented NIM carrier-card placement |
Keeps the analog voice module inside the platform context Cisco documents |
|
Software and package |
NIM-4FXS IOS XE release row plus the Unified Communications technology package for voice applications |
Aligns the module with Cisco voice-application requirements |
|
Signaling and tone plan |
DID, groundStart, or loopStart signaling plus the cptone locale |
Reduces turn-up changes for station-side or incoming DID service |
|
Ring behavior |
Ring frequency and ring cadence requirements for attached analog equipment |
Matches Cisco FXS configuration options to the endpoint or site plan |
|
Cabling and OIR timing |
Straight-through 2-wire cable path and no active calls before managed OIR |
Follows Cisco cabling guidance and managed OIR restrictions for voice NIM work |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | NIM-4FXS | Product type | FXS analog voice Network Interface Module |
| Cisco ordering description | 4-Port Network Interface Module – FXS, FXS-E and DID | Port count | 4 FXS/FXS-E/DID-capable voice ports |
| Analog interface role | Station-side FXS service or DID incoming-call service | ISR G2 comparison | VIC3-4FXS/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 |
| DID caller ID note | DID mode does not support caller ID | FXS feature notes | FXS or DID functionality, configurable long loop ports, message waiting indicator, and cable detection |
| FXS signaling options | did delay-dial, did immediate, did loopStart, groundStart, or loopStart | Ring frequency options | 20, 25, 30, or 50 Hz |
| Call progress tone setting | cptone locale under voice-port configuration | Ring cadence setting | Predefined or user-defined ring cadence under FXS 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 | Analog NIM jumper note | No jumpers to set on NIM analog modules |
| Network management | Remote and local configuration, monitoring, and troubleshooting from Cisco IOS XE Software CLI | Weight | 0.44 lb (200 g) |
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Quality Certifications
Customer Reviews
Questions & Answers
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What does NIM-4FXS provide?
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How is NIM-4FXS different from NIM-4FXO?
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When is NIM-4FXS still selected?
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Does NIM-4FXS need DSP planning?
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What cabling detail matters for NIM-4FXS?
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Why does NIM-4FXS have no dial tone?
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Can NIM-4FXS terminate PSTN lines?
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Which NIM-2FXS/4FXO ordering check matters most?
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