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by Cisco
Product Line: Cisco Network Interface Modules (NIM)
Product Type: Network Interface Module
Original price $0.00 - Original price $290.00
Original price
$0.00 - $290.00
Current price $290.00
Title: Used

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Product Description

The NIM2FXS4FXO module features a total of 6 ports, including 2 FXS/FXS-E/DID ports and 4 FXO ports, compatible with Cisco IOS Releases XE3.14.3, XE3.15.1, XE3.16 and above, and designed for Cisco 4400 and 4300 ISR series. It adheres to multiple international standards such as TIA-968-B, CS-03, AS/CA S003, and PTC220, and is engineered for enhanced voice communication with features like echo cancellation, comfort noise generation, and DTMF detection. The module supports critical FXS and FXO functionalities, including configurable long loop ports, message waiting indicator for FXS, and ground start and loop start modes for FXO, alongside comprehensive immunity standards like CISPR24: 2010 and EN 300 386 V1.6.1.

Key Feature for the NIM2FXS4FXO

  • What is the total number of ports available on this device?
    There are 6 total ports.
  • How many FXO ports does the device include?
    The device includes 4 FXO ports.
  • Can this hardware operate with Cisco IOS Release XE3.16?
    Yes, it supports Cisco IOS Release XE3.14.3, XE3.15.1, XE3.16, and above.
  • Are Cisco 2900 and 3900 Series ISRs compatible with this hardware?
    No, this hardware does not support Cisco 2900 and 3900 Series ISRs.
  • What types of connections can FXS ports be used for?
    FXS ports can connect directly to phones, fax machines, and key systems.
  • Does the hardware support echo cancellation?
    Yes, echo cancellation is supported.
  • Which ISR series are compatible with this device?
    It is compatible with Cisco 4400 and 4300 Series ISRs.
  • What standards does this device comply with?
    It complies with TIA-968-B (USA), CS-03 (Canada), AS/CA S003 (Australia), and PTC220 (New Zealand).
  • What type of cable is required for this hardware?
    A straight-through 2-wire cable is required.
  • Does the device provide features for both FXS and FXO ports?
    Yes, it includes features for both FXS and FXO ports, such as ground and loop start modes for FXO ports and configurable long loop ports for FXS/DID functionality.

Product Review

The Cisco NIM2FXS4FXO module offers a balanced mix of 2 FXS and 4 FXO ports, catering to versatile voice interfacing requirements for businesses, especially valuable for connecting to PSTN and supporting legacy telephony equipment. Compatibility with Cisco IOS Releases XE3.14.3 and above, along with support for ISR 4400 and 4300 series, ensures easy integration into existing network infrastructures. However, the absence of support for Cisco 2900 and 3900 series ISRs limits its application in environments relying on these older platforms.


The Cisco NIM2FXS4FXO is a network interface module designed to provide flexible voice and fax communication in Cisco Integrated Services Routers (ISR) Series 4400 and 4300. This module is equipped with a total of six ports, comprising two Foreign Exchange Station (FXS)/Foreign Exchange Subscriber (FXS-E)/Direct Inward Dialing (DID) ports and four Foreign Exchange Office (FXO) ports. It is compatible with Cisco IOS Releases XE3.14.3, XE3.15.1, XE3.16 and above, ensuring seamless integration with the latest network operating systems. This hardware module adheres to multiple standards including TIA-968-B for the USA, CS-03 for Canada, AS/CA S003 for Australia, and PTC220 for New Zealand, ensuring its compliance with international telecommunications standards. Additionally, it meets various immunity specifications such as CISPR24: 2010, EN 300 386 V1.6.1, EN55024: 2010, KN24: 2011, and TCVN 7317: 2003, providing robust protection against external electrical interferences. Weighing only 0.52 lbs, this compact module is designed for easy installation and minimal rack space usage. It supports key voice features such as echo cancellation, comfort noise generation, Dual-tone Multi-frequency (DTMF) detection, voice activity detection, modem detection and pass-through, RFC 4733 digit relay, and acoustic shock protection. These features ensure high-quality, reliable communication for voice and fax services. The FXS ports on the Cisco NIM2FXS4FXO offer functionalities suitable for direct connections to phones, fax machines, and key systems, featuring configurable long loop ports, message waiting indication, and cable detection. These ports can operate in either FXS or DID modes, providing flexibility for a variety of telephony applications. On the other hand, the FXO ports are designed for connection to a PBX or key systems and off-premises connections to the Public Switched Telephone Network (PSTN). They support both ground start and loop start modes and are equipped with features such as Caller ID Display (CDR) information, internetworking capabilities, cable detection, and overload protection, ensuring reliable operation under various network conditions.
  • Cable Type: Straight-Through 2-Wire
  • SNMP Traps: Generated in response to alarms for efficient network management.
  • OIR Support: Yes, allowing for hot swapping of the module without disrupting the router operation.
It is important to note that this module does not support jumpers and is not compatible with Cisco 2900 and 3900 Series ISRs, limiting its use to the specified 4400 and 4300 Series only. Despite these limitations, its analog nature and support for SNMP traps make it a versatile choice for businesses looking to integrate voice and fax services into their existing network infrastructure. Overall, the Cisco NIM2FXS4FXO module provides essential features for voice and fax communication, offering businesses a reliable solution for integrating these services into their Cisco ISR routers. Its compliance with international standards, support for critical voice functionalities, and compatibility with specific Cisco routers make it a valuable asset for any network requiring voice communication capabilities.


Model NumberNIM2FXS4FXO
Total Ports6
FXS/FXS-E/DID Port Count2
FXO Port Count4
Compatible Cisco IOS VersionsXE3.14.3, XE3.15.1, XE3.16+
Compatible ISR Models4400, 4300 Series
Compliance StandardsTIA-968-B (US), CS-03 (Canada), AS/CA S003 (Australia), PTC220 (New Zealand)
Immunity Standards MetCISPR24: 2010, EN 300 386 V1.6.1, EN55024: 2010, KN24: 2011, TCVN 7317: 2003
Product Weight0.52 lbs
Supports Echo ReductionYes
Generates Comfort NoiseYes
DTMF Tone RecognitionYes
Voice Detection CapabilityYes
Supports Modem Detection/Pass-ThroughYes
Supports RFC 4733 Digit RelayYes
Includes Acoustic Shock ProtectionYes
FXS Special FeaturesFXS/DID Modes, Extended Loop Ports, Visual Message Indicator, Cable Integrity Test
FXO Special FeaturesGround/Loop Start, Call Detail Record Tracking, Network Bridging, Cable Integrity Test, Overcurrent Safety
FXO Usage ScenariosPBX or Key Systems, PSTN Off-Premises Extensions
FXS Usage ScenariosDirect Connect: Telephones, Fax Machines, Key Systems
Recommended Cable2-Wire Straight-Through
Alarm-Triggered SNMP NotificationsYes
Jumpers PresentNo
Compatibility with 2900, 3900 Series ISRNo
Supports Online Insertion and Removal (OIR)Yes

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