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NIM-2FXS/4FXO – 2 Ports FXS and 4 Ports FXO Network Interface Module
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NIM-2FXS/4FXO Description
Cisco NIM-2FXS/4FXO is a hybrid analog voice Network Interface Module for Cisco ISR 4000 Series routers, offering two Foreign Exchange Station (FXS) ports and four Foreign Exchange Office (FXO) ports on a single card. The FXS ports can also function as Direct Inward Dial (DID) interfaces for inbound PSTN calls, while the FXO ports provide PSTN/PBX trunk connectivity with loop-start and ground-start signaling. With onboard DSP resources, the module supports up to 128-ms echo cancellation, comprehensive codec coverage, T.38 fax relay, and modem pass-through. It integrates seamlessly with Unified Communications protocols including SCCP, H.323, SIP, and MGCP, supports online insertion and removal (OIR), and is fully compatible with Cisco ISR 4300/4400 platforms running Cisco IOS XE software.
Key Features
Hybrid FXS/FXO Design
Provides 2 FXS ports with DID capability plus 4 FXO ports, combining analog station support and PSTN trunk connectivity on one module.
Integrated DSP for Voice Services
Onboard DSP eliminates the need for router PVDMs, enabling time-division multiplexed voice, echo cancellation up to 128 ms, and consistent call quality.
Extensive Codec Coverage
Supports G.711, G.729a, G.726, plus G.723 and iSAC, ensuring flexible bandwidth optimization and interoperability across enterprise voice networks.
Enterprise Telephony Features
Offers caller-ID generation (FXS), detection (FXO), battery polarity reversal, Message Waiting Indicator (MWI), cable detection, and overload protection.
Legacy Device Compatibility
Delivers T.38 fax relay, fax pass-through, and modem pass-through for analog fax machines, POS systems, alarms, and dial-up devices in critical industries.
Unified Communications Integration
Supports OIR on ISR 4300/4400 routers, SNMP/MIB management, and interworks with SCCP, H.323, SIP, and MGCP 1.0 under Cisco IOS XE software.
Applications Scenarios
Branch offices and mixed telephony
Deploy both analog station lines and PSTN trunks on one router, ensuring smooth migration to VoIP while retaining legacy voice services.
Hospitality and retail operations
Combine front-desk phones, guest-room analog lines, fax machines, and PSTN trunks in hotels and retail sites with unified management.
Public sector and healthcare
Maintain fax, modem, and analog phone connectivity while adding PSTN backup trunks for emergency services and regulatory compliance.
Product Comparison
|
Parameter |
NIM-2FXS/4FXO | ||
|---|---|---|---|
|
Port makeup |
2 × FXS (FXS/DID) |
4 × FXO |
2 × FXS (FXS/DID) + 4 × FXO |
|
DID capability |
Yes (inbound only) |
No |
Yes (FXS ports) |
|
MWI support |
Supported |
N/A |
Supported (FXS) |
|
Caller-ID / polarity |
Generation (FXS) |
Detection (FXO) |
Both (FXS generate, FXO detect) |
|
Signaling |
FXS, DID |
FXO loop/ground |
Both FXS and FXO |
|
Onboard DSP |
Yes |
Yes |
Yes |
|
Echo cancellation |
Up to 128 ms |
Up to 128 ms |
Up to 128 ms |
|
Codecs |
G.711/G.729a/G.726; G.723, iSAC |
Same |
Same |
|
Fax/modem |
T.38, pass-through |
Same |
Same |
|
Protocol interworking |
SCCP/H.323/SIP/MGCP |
Same |
Same |
|
OIR support |
Yes |
Yes |
Yes |
|
Minimum IOS XE |
3.13.4+ |
3.13.4+ |
3.14.3+ |
|
Weight |
0.42 lb (191 g) |
0.44 lb (200 g) |
0.52 lb (236 g) |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Model | NIM-2FXS/4FXO (2-port FXS + 4-port FXO Network Interface Module) | Form factor | NIM plug-in module for Cisco ISR 4000 Series |
| Ports | 2 × FXS and 4 × FXO, RJ-11 connectors | Interface type | Mixed Foreign Exchange Station (FXS) and Foreign Exchange Office (FXO) |
| Platform support | Cisco ISR 4321, 4331, 4351, 4431, 4451 | Online Insertion/Removal (OIR) | Supported |
| Typical devices connected (FXS) | Analog telephones, fax machines, modems, key systems | Typical devices connected (FXO) | PSTN lines, PBX trunks, analog CO connections |
| Signaling (FXS) | Loop start, Ground start | Signaling (FXO) | Loop start, Ground start |
| Ring voltage (FXS) | Up to 75 Vrms, 20–25 Hz | Loop current (FXS) | 20 mA to 30 mA nominal |
| Caller ID / Polarity reversal | Supported (Type I/II) | Battery reversal detection (FXO) | Supported |
| Voice codecs | G.711 (A/μ-law), G.729a/b, G.726, G.723.1 | Fax/Modem | T.38 Fax Relay, Fax/Modem passthrough |
| Protocol interworking | SIP, SCCP, H.323, MGCP 1.0 | RTP features | RTP/RTCP, RFC 4733 (DTMF relay) |
| Echo cancellation | Up to 128 ms tail length | Voice optimizations | VAD, CNG, cRTP (Compressed RTP) |
| DSP resources | On-module DSP (no chassis PVDM required) | Country configuration | Software-selectable (global homologation) |
| Cabling | 2-wire analog, straight-through RJ-11 | Use cases | Mixed analog device & PSTN connectivity in branch voice gateways |
| Minimum software | Cisco IOS XE 3.13 or later (UC license) | Management | CLI (console/SSH), SNMP, Cisco Prime Collaboration |
| Regulatory compliance | TIA-968-B (US), CS-03 (CA), AS/CA S002/S003 (AU), TBR 21 (EU) | Weight | Approx. 0.48 lb (≈220 g) |
| Power consumption | Under 12 W typical | Operating temperature | 0°C to 40°C (32°F to 104°F) |
| Ordering PID | NIM-2FXS/4FXO | Warranty | Per Cisco standard hardware warranty policy |
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Customer Reviews
Questions & Answers
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What is NIM-2FXS/4FXO designed for?
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Why choose NIM-2FXS/4FXO over separate modules?
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Is SRST supported with this mixed module?
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How does it integrate with CUCM?
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Can I prioritize emergency calls?
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What about caller ID and impedance?
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How to manage capacity limits?
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Any typical pitfalls?
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