NIM-2FXS – 2-Port FXS Voice – Analog NIM – Cisco 4000 ISR
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NIM-2FXS Description
The NIM-2FXS is a Cisco analog voice Network Interface Module for the NIM slots of Cisco 4300 and 4400 Series ISRs that serve analog phones, fax machines and key systems in branch offices. The module has two FXS voice ports that connect over straight-through 2-wire cable, carries onboard DSP so the router needs no PVDM, and supports online insertion and removal. Voice use needs the Unified Communications technology package and Cisco IOS XE 3.13.4 or later, and Cisco 2900 and 3900 Series ISRs do not support the module.
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 |
|
Total ports |
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
A branch office router connects analog desk phones and a fax machine straight to the two FXS ports, so these legacy endpoints are served by the router’s own voice gateway.
At a site that receives direct-dial numbers over an off-premises DID connection, the module takes the incoming PSTN calls on an FXS-class port, and DID mode carries no caller ID.
Product Comparison
|
Parameter |
NIM-2FXS | ||
|---|---|---|---|
|
Total ports |
2 FXS ports |
4 FXS ports |
2 FXO ports |
|
Product description |
2-port NIM, FXS, FXS-E, and DID |
4-port NIM, FXS, FXS-E, and DID |
2-port NIM, FXO (Universal) |
|
Cisco IOS XE release |
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 design |
Onboard DSP; no PVDM required |
Onboard DSP; no PVDM required |
Onboard DSP; no PVDM required |
|
Supported host |
Cisco 4300 and 4400 Series ISR NIM slots |
Cisco 4300 and 4400 Series ISR NIM slots |
Cisco 4300 and 4400 Series ISR NIM slots |
NIM-2FXS carries two FXS ports for analog phones, fax machines and key systems, while NIM-4FXS offers the same FXS, FXS-E and DID description on four ports, so the number of station-side devices to connect decides between them. Sites that terminate PBX or PSTN lines rather than phones need NIM-2FXO, whose two FXO ports are line-side; an FXS card cannot take that role. DID mode accepts incoming calls only and gives no caller ID, which matters when the card is planned for direct-dial trunks. All three modules start at IOS XE 3.13.4 and include onboard DSP, so neither the software release nor a PVDM separates them.
Ordering Checklist
- Supported hosts: Order for the NIM slots of Cisco 4300 and 4400 Series ISRs; the datasheet does not list Cisco 2900 or 3900 Series, so the module cannot be ordered for those routers.
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 | Total ports | 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) |
Quality Certifications
Customer Reviews
Questions & Answers
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Which routers can host NIM-2FXS?
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Which Cisco IOS XE release does NIM-2FXS need?
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Does NIM-2FXS support the clock-participate command?
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Is NIM-2FXS affected by field notice FN64321 or the IOS XE 16.5 requirement?
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Which FXS features does NIM-2FXS offer on its two ports?
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Which routers can host NIM-2FXS and what software package does it need?
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