Cisco WS-G5491 Full Official Product Description
1. Part Number & Naming Definition
Commercial Full Name
Cisco 1000BASE-ZX+ Ultra Long Reach Gigabit GBIC Optical Transceiver Module
SKU:WS-G5491
Naming Breakdown
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WS: Cisco Catalyst Switch hardware prefix
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G: Gigabit Ethernet
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5491: Market designation for ultra-long-reach GBIC transceiver
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ZX+: Extended ultra-long-distance single-mode Gigabit optical specification
Core Product Positioning
The Cisco WS-G5491 is a hot‑swappable MSA‑compliant GBIC optical transceiver designed for ultra-long-distance Gigabit Ethernet transmission over single-mode fiber. It delivers extended fiber reach beyond standard 1000BASE-ZX, suitable for metropolitan backbone, inter-city enterprise links and remote site inter-switch connections on dark single-mode fiber. Optical attenuators are mandatory for short spans to prevent receiver overload. It operates seamlessly within legacy Catalyst modular switches equipped with GBIC slots.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Catalyst 4000, 4500, 5000, 6000, 6500 Series modular switches with GBIC interface slots
Supported IOS Releases
All mainstream Cisco IOS firmware versions with native GBIC transceiver recognition
Supported Fiber Type
Single‑Mode Fiber (SMF, 9/125μm) only; incompatible with multi-mode fiber
Unsupported Platforms
SFP‑only switches, Nexus data center switches, MDS SAN directors, ISR routers
Reminder: GBIC cannot be directly inserted into SFP slots without dedicated adapter hardware.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable GBIC module compliant with GBIC MSA standard
Optical Interface
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Operating Wavelength: 1550 nm (DFB laser)
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Connector: Duplex SC
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Data Rate: 1.25 Gbps wire‑speed Gigabit Ethernet
Maximum Transmission Reach
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Standard single‑mode fiber: Up to120 km
Important: Optical attenuator is required for fiber spans shorter than 30 km to avoid receiver saturation.
Optical Power Budget
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Transmit Power: +0 dBm ~ +5 dBm
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Receiver Sensitivity: Minimum -28 dBm
Digital Diagnostics
No Digital Diagnostic Monitoring Interface (DDMI) support
Environmental Operating Parameters
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Operating Temperature: 0°C ~ 70°C (32°F ~ 158°F)
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Storage Temperature: -40°C ~ 85°C (-40°F ~ 185°F)
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Relative Humidity: 10% – 90%, non‑condensing
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Maximum operating altitude: 3,000 meters
Typical Power Consumption
4. Supported Functional Capabilities
Ethernet Transport
Wire‑speed Gigabit Ethernet transmission, auto‑negotiation, full‑duplex operation
Layer 2 Protocol Support
802.1Q VLAN trunking, 802.3x flow control, LACP, STP/RSTP/MSTP, EtherChannel aggregation
Interface Diagnostics
Link status detection, port error counters, local loopback testing
High Availability
OIR hot‑swap capability on supported Catalyst chassis; link redundancy via spanning tree or port channels
Operations & Management
IOS CLI, SSH, SNMP v2c/v3, Syslog logging, real‑time interface statistics monitoring
5. Typical Deployment Scenarios
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Ultra-long-distance inter-building and inter-metro enterprise backbone fiber links
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Wide-area network connections over leased dark single-mode fiber infrastructure
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Remote industrial campus and geographically distributed site inter-switch connectivity
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Legacy Catalyst 6500 core switch long-range fiber uplink deployments
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Spare replacement transceiver hardware for existing GBIC‑based Catalyst switching environments
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950‑1, IEC/EN 60950‑1, CSA C22.2 No.60950‑1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES‑003 Class A, VCCI Class A
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Laser Safety: Class 1 Laser Product per IEC 60825‑1
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Environmental: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco WS-G5491 1000BASE-ZX+ Ultra Long Reach GBIC Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Note: Fiber patch cables and optical attenuators are sold separately.
End-of-Sale Status
The GBIC form factor including ultra-long-reach variants has reached Cisco End‑of‑Sale. Spare inventory is available through authorized spare distributors and secondary hardware markets. Recommended migration: 1000BASE-ZX SFP transceivers for modern SFP‑based switching platforms.
UNSPSC Classification Code
43222618 – Cisco WS-G5491 1000BASE-ZX+ GBIC optical transceiver, hot‑swappable ultra-long-reach single-mode Gigabit fiber module for legacy Catalyst modular enterprise switches.
Hardware Warranty
Original factory hardware carries Cisco limited hardware warranty; refurbished equipment follows reseller commercial warranty terms.
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