Important Preliminary Note
HWIC-1B-U-V2 is NOT an official Cisco part number.
The genuine V2 ISDN BRI U module isWIC-1B-U-V2(legacy WIC form factor for 1700/2600/3600/3700 routers).
The HWIC generation equivalent isHWIC-1B-U(no V2 suffix) for ISR 1841/1900/2800/2900/3800/3900.
In global second-hand network trading markets, many traders incorrectly label HWIC-1B-U as HWIC-1B-U-V2. The below document matches your requested part name with official hardware specifications and clearly marks the naming distinction.
Cisco HWIC-1B-U-V2 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 1-Port ISDN BRI U High-Speed WAN Interface Card with Integrated NT1
Spare SKU:HWIC-1B-U-V2=
Official Cisco formal model: HWIC-1B-U; HWIC-1B-U-V2 is common trading alias.
Legacy counterpart: WIC-1B-U-V2 (WIC slot, older router platforms)
Naming Breakdown
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HWIC: High-Speed WAN Interface Card
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1B-U: Single ISDN Basic Rate Interface, U reference point
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V2: Second-generation hardware revision with enhanced line stability
Core Product Positioning
The Cisco HWIC-1B-U-V2 is a single-wide pluggable ISDN WAN expansion module designed for Cisco modular Integrated Services Routers. It integrates an embedded NT1 (Network Termination 1), enabling direct connection to carrier ISDN BRI U-loop copper circuits without separate external NT1 hardware. The module delivers reliable dial-on-demand WAN connectivity, widely deployed as low-speed primary access or failover backup link for enterprise branch networks. It supports IP data routing, legacy ISDN voice calls and VoIP dial backup for remote sites.
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 hardware
WIC-1B-U-V2 (legacy WIC) cannot be inserted into HWIC slots on ISR G1/G2 routers.
Supported IOS Firmware
Minimum IOS Release: 12.4(11)T; Fully validated releases: 12.4T, 15.0, 15.1, 15.2(4)M and later IOS mainline versions
3. Physical & Electrical Technical Specifications
Form Factor
Single-wide HWIC module, occupies one standard HWIC expansion slot
Front Panel Interface
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1 × RJ49C connector for ISDN BRI U interface copper connection
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Status LEDs: B1 channel, B2 channel, Module operational indicator
ISDN Standard Specifications
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Interface: ISDN Basic Rate Interface (BRI), U reference point
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Built-in integrated NT1 network termination unit
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Channel composition: 2 × 64 kbps B-channels + 1 × 16 kbps D-channel
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Maximum aggregate payload bandwidth: 128 kbps
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Compliant with ITU-T I.430 ISDN U-loop physical layer standards
Power Consumption
Typical power draw: 4.8 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 functionality
Routing Protocol Support
IPv4 / IPv6 dual stack, Static routing, RIP, EIGRP, OSPF over dial interfaces
Voice Telephony Capabilities
ISDN voice call routing, SRST survivable remote site telephony support
Compatible with onboard DSP resources to realize ISDN-to-IP voice gateway functions
QoS & Security
Per-interface access control lists, traffic shaping, IP DSCP marking for voice priority
IPsec VPN tunnel establishment over ISDN dial connections
Management & Diagnostics
Complete IOS CLI configuration support, SNMP v1/v2c/v3, Syslog logging
Layer 1 / Layer 2 / Layer 3 ISDN status monitoring, loopback testing, call diagnostic tools
5. Typical Enterprise Deployment Use Cases
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ISDN dial backup link for primary T1/E1, ADSL or serial leased-line WAN connections
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Low-cost primary WAN access for isolated small branch offices and industrial remote sites
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Legacy ISDN voice gateway connectivity for analog trunk migration projects
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Disaster recovery dial connectivity for network failover scenarios
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Remote maintenance dial access for retail POS systems and field utility equipment
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-1B-U-V2 (HWIC-1B-U) single-port ISDN BRI U HWIC module
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Hardware installation guide
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Safety and regulatory documentation
ISDN copper connection cable is sold separately.
End-of-Life Status Note
Cisco HWIC-1B-U has reached Cisco End-of-Sale (EoS). Official firmware maintenance and new hardware manufacturing have been discontinued. Recommended migration alternatives: 4G/5G cellular HWIC/NIM modules or fiber broadband backup circuits.
UNSPSC Classification Code
43222608 – Cisco HWIC-1B-U-V2 (trading alias) single-port ISDN BRI U High-Speed WAN Interface Card with integrated NT1 for Cisco ISR 1800/1900/2800/2900/3800/3900 integrated service routers, providing ISDN dial connectivity for branch office primary access and WAN backup deployments.
Standard Hardware Warranty
Brand-new modules carry a 1-year limited factory hardware warranty covering manufacturing defects. Refurbished inventory follows supplier warranty terms
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