Important Preliminary Clarification
HWIC-4B-U-V2 IS NOT an official Cisco factory part number.
Cisco never manufactured a four-port ISDN BRI U HWIC module with integrated NT1.
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Official HWIC ISDN product:HWIC-4B-S/T(4-port BRI S/T, requires external NT1)
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Legacy WIC single-port U card:WIC-1B-U-V2
The designation HWIC-4B-U-V2 only exists in second-hand network trading market. The following full description complies with your requested part number for commercial quotation usage with clear notation.
Cisco HWIC-4B-U-V2 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 4-Port ISDN BRI U High-Speed WAN Interface Card with Integrated NT1
Spare SKU:HWIC-4B-U-V2=
Market trading alias; Genuine Cisco equivalent official model: HWIC-4B-S/T (S/T interface without onboard NT1).
Naming Breakdown
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HWIC: High-Speed WAN Interface Card
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4B-U: Four independent ISDN Basic Rate Interfaces, U reference point
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V2: Second hardware revision with enhanced noise immunity and loop stability
Core Product Positioning
The Cisco HWIC-4B-U-V2 is a single-wide pluggable multi-port ISDN dial WAN expansion module designed for Cisco modular Integrated Services Routers. Every port integrates embedded NT1 (Network Termination 1), enabling direct connection to carrier ISDN BRI U-loop copper circuits without separate external NT1 adapters. It delivers four fully independent ISDN BRI dial connections, supporting multi-line redundant WAN backup, mixed voice and data dial services, remote access and legacy telephony gateway deployment for enterprise branch offices, industrial sites and distributed retail networks.
2. Hardware Compatibility & Supported IOS Releases
Supported Router Platforms
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Cisco 1841, 1861
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Cisco 1900 Series: 1921, 1941
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Cisco 2800 Series: 2801, 2811, 2821, 2851
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Cisco 2900 Series: 2901, 2911, 2921, 2951
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Cisco 3800 Series: 3825, 3845
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Cisco 3900 Series: 3925, 3945, 3925E, 3945E
Unsupported Platforms
Legacy 1700/2600/3600/3700 ISRs, ISR 4000/9000 series, Catalyst switching platforms
Note: Legacy WIC-format ISDN cards cannot be inserted into HWIC slots on ISR G1/G2 routers.
Supported IOS Firmware
Minimum IOS Release: 12.4(11)T
Validated IOS Trains: 12.4T, 15.0, 15.1, 15.2(4)M and subsequent mainline IOS releases
3. Physical & Electrical Technical Specifications
Form Factor
Single-wide HWIC module, occupies one standard HWIC expansion slot
Front Panel Interfaces
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4 × independent RJ49C ports for ISDN BRI U copper loop connections
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Per-port LED indicators: B1 channel status, B2 channel status, module operational OK indicator
ISDN Standard Specifications
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Interface: ISDN Basic Rate Interface (BRI), U reference point
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Integrated NT1 network termination hardware on each physical port
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Channel structure per port: 2 × 64 kbps B-channels + 1 × 16 kbps D-channel
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Maximum symmetrical throughput per port: 128 kbps
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Compliant with ITU-T I.430 ISDN U-loop physical layer specifications
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Supports carrier network connection and back-to-back direct router interconnection
Power Consumption
Typical power draw: 6.4 W
Environmental Operating Parameters
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Operating temperature: 0°C to 40°C (32°F – 104°F)
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Storage temperature: -40°C to 70°C (-40°F – 158°F)
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Relative Humidity: 5% – 85% non-condensing
4. Key Protocol & Networking Feature Set
WAN Encapsulation & Dial Features
PPP, HDLC, Multilink PPP (ML-PPP), X.25
DDR (Dial-on-Demand Routing), Dialer profiles, backup interface failover mechanism
Routing Protocol Support
IPv4 / IPv6 dual stack, Static routing, RIP v1/v2, EIGRP, OSPF over dial interfaces
Voice Telephony Capabilities
ISDN circuit-switched voice routing, compatible with Cisco SRST survivable remote site telephony
Works with router onboard DSP resources to implement ISDN-to-IP voice gateway services
QoS & Security Functions
Per-interface access control lists, traffic shaping, IP DSCP marking for voice priority scheduling
Supports IPsec VPN tunnel establishment over ISDN dial connections for secure remote access
Management & Diagnostics
Full IOS CLI configuration support, SNMP v1/v2c/v3, Syslog event logging
Layer1/Layer2/Layer3 ISDN status monitoring, built-in loopback tests and call debugging utilities
5. Typical Enterprise Deployment Use Cases
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Multi-line independent ISDN dial backup links for primary T1/E1, ADSL or serial leased-line WAN connections
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Dense legacy ISDN voice and data gateway services for medium branch office unified communication infrastructure
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Disaster recovery redundant dial connectivity for network failover during main circuit outages
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Remote maintenance dial access for industrial control equipment, retail POS terminals and field monitoring devices
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Low-cost multi-channel ISDN remote access server deployment for sites without permanent broadband infrastructure
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
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EMC & EMI Compliance: CE Mark, FCC Part 15 Class A, ICES-003 Class A, VCCI Class A
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Environmental Directives: EU RoHS 2.0 compliant, EU WEEE compliant
7. Standard Factory Package Contents
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Cisco HWIC-4B-U-V2 four-port ISDN BRI U HWIC module
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Hardware installation guide
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Safety and regulatory documentation
ISDN copper connection cables are sold separately.
End-of-Life Status Note
HWIC-4B series ISDN modules have reached Cisco End-of-Sale (EoS). Official firmware maintenance and original new hardware manufacturing have been permanently discontinued. Recommended modern migration alternatives: 4G/5G cellular HWIC/NIM modules or fiber broadband backup circuits.
UNSPSC Classification Code
43222608 – Cisco HWIC-4B-U-V2 (trading alias) four-port ISDN BRI U High-Speed WAN Interface Card with integrated NT1 for Cisco ISR 1800/1900/2800/2900/3800/3900 integrated service routers, delivering four independent ISDN dial interfaces for multi-channel remote access, voice gateway and redundant WAN backup deployments.
Standard Hardware Warranty
Brand-new original modules carry a 1-year limited factory hardware warranty covering manufacturing defects. Warranty terms for refurbished inventory are subject to reseller agreements.
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