NIM-4FXO – 4-Port FXO Voice – Analog NIM – Cisco 4000 ISR
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NIM-4FXO Description
NIM-4FXO is a Cisco 4000 Series ISR 4-port FXO Network Interface Module for adding analog Foreign Exchange Office line interfaces to a router-based voice gateway. It fits Cisco 4000 Series ISR NIM slots for branch or campus voice deployments that need PSTN, PBX, key-system, off-premises, or analog CAMA trunk connectivity, with Cisco documentation confirming the 4 FXO voice ports, Universal ordering description, onboard DSP design, straight-through 2-wire cabling for FXO or FXS port connections, OIR support in supported ISR slots, and IOS XE release rows for this module.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
NIM-4FXO |
|
Product type |
4-port FXO Network Interface Module |
|
Cisco ordering description |
4-port Network Interface Module – FXO (Universal) |
|
Port count |
4 FXO voice ports |
|
Analog interface role |
Foreign Exchange Office line interface |
|
ISR G2 comparison |
VIC2-4FXO |
|
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 |
0.44 lb (200 g) |
Application Scenarios
Order NIM-4FXO for a Cisco 4000 Series ISR voice gateway that must terminate four analog FXO line interfaces from a PSTN provider, PBX, key system, or CAMA service.
Keep the bill on this module when all analog positions are line-side FXO trunks and the design does not require the station-side or DID positions found on NIM-2FXS/4FXO.
Treat the telco or PBX handoff as a separate turn-up item, since FXO service depends on loop-start or ground-start signaling, DTMF or pulse dialing, ring handling, disconnect behavior, and the straight-through 2-wire cable run.
Product Comparison
|
Parameter |
NIM-4FXO | ||
|---|---|---|---|
|
Cisco ordering description |
4-port Network Interface Module – FXO (Universal) |
2-port Network Interface Module – FXO (Universal) |
2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module |
|
Product type |
FXO analog voice Network Interface Module |
FXO analog voice Network Interface Module |
Combination FXS and FXO analog voice Network Interface Module |
|
Port count |
4 FXO ports |
2 FXO ports |
2 FXS/FXS-E/DID ports and 4 FXO ports |
|
Primary interface role |
Line-side FXO analog voice |
Line-side FXO analog voice |
Mixed station-side FXS/DID and line-side FXO analog voice |
|
ISR G2 comparison |
VIC2-4FXO |
VIC2-2FXO |
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 |
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 |
0.44 lb (200 g) |
0.42 lb (191 g) |
0.52 lb (236 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-4FXO vs NIM-2FXO comparison, the difference is FXO density: NIM-4FXO provides four FXO ports, while NIM-2FXO provides two.
- The NIM-4FXO difference from NIM-2FXS/4FXO is interface scope. Both rows include four FXO ports, but only NIM-2FXS/4FXO adds two FXS/FXS-E/DID positions.
- For buyers comparing NIM-4FXO vs NIM-2FXO or NIM-2FXS/4FXO, which model to choose depends on FXO line count, whether FXS or DID service is also required, and the Cisco IOS XE release row in the table.
Selection Guide
1. Fit four FXO handoffs
Select NIM-4FXO when the bill needs four line-side FXO ports in one Cisco 4000 Series ISR NIM slot.
2. Keep the smaller FXO card for two lines
Choose NIM-2FXO only when the confirmed analog requirement is two FXO trunks rather than four.
3. Pick the mixed card for endpoint service
Move to NIM-2FXS/4FXO when the router slot must include FXS/FXS-E/DID positions along with four FXO ports.
4. Close the voice configuration checks
Validate IOS XE, the Unified Communications package, signaling, dialing, cptone locale, ring handling, and managed OIR timing before the quote is finalized.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Product identity |
NIM-4FXO four-port FXO NIM |
Prevents mixing this FXO-only module with the two-port NIM-2FXO or the combo FXS/FXO card |
|
Analog service direction |
FXO line-side handoff for PSTN, PBX, key-system, or CAMA service |
Avoids ordering station-side FXS capacity when the carrier handoff requires FXO |
|
ISR placement |
Cisco 4000 Series ISR NIM slot or Cisco-documented carrier-card placement |
Keeps the module inside the router context documented by Cisco |
|
Software and package |
NIM-4FXO IOS XE row plus the Unified Communications technology package for voice applications |
Aligns the module with Cisco voice enablement requirements |
|
FXO turn-up data |
loopStart or groundStart signal, DTMF or pulse dialing, cptone locale, ring count, and disconnect behavior |
Gives the installer the telephony inputs needed before cutover |
|
Cable and maintenance window |
Straight-through 2-wire cable path and no active calls during managed OIR |
Matches Cisco cabling guidance and OIR restrictions for voice and fax NIM work |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | NIM-4FXO | Product type | FXO analog voice Network Interface Module |
| Cisco ordering description | 4-port Network Interface Module – FXO (Universal) | Port count | 4 FXO voice ports |
| Analog interface role | Foreign Exchange Office line interface | ISR G2 comparison | VIC2-4FXO |
| 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 |
| FXO signaling options | groundStart or loopStart | Dialing method options | DTMF, MF, or pulse |
| Call progress tone setting | cptone locale under voice-port configuration | Ring detection setting | ring number under FXO voice-port configuration |
| FXO connection role | PBX, key system, off-premises PSTN connection, or analog CAMA trunk service | FXO feature notes | Caller ID, battery reversal detection, cable detection, and overload protection |
| 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 FXO and FXS 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 | 0.44 lb (200 g) |
Get More Information
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Customer Reviews
Questions & Answers
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What does NIM-4FXO provide?
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How is NIM-4FXO different from NIM-2FXO?
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When is NIM-4FXO selected over SIP trunks?
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What line checks matter with NIM-4FXO?
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Does NIM-4FXO need DSP planning?
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Why does NIM-4FXO appear stopped or removed?
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Can NIM-4FXO connect analog phones directly?
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What capacity question does NIM-4FXO answer?
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