Cisco GLC-BX40-U Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 1000BASE-BX40-U Bidirectional Single-Fiber SFP Optical Transceiver Module with DOM Support
SKU:GLC-BX40-U
Naming Breakdown
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GLC: Gigabit Ethernet Small Form-Factor Pluggable Transceiver
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BX: Bidirectional Single-Fiber WDM Optical Transmission
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40: Maximum transmission distance of 40 kilometers
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U: Upstream: Transmit 1310nm, Receive 1490nm (Must pair with GLC-BX40-D)
Core Product Positioning
The Cisco GLC-BX40-U is a hot‑swappable BiDi SFP optical transceiver utilizing Wavelength Division Multiplexing (WDM). It delivers full-duplex Gigabit Ethernet overone single strand of single-mode fiber (SMF). It transmits optical signals at 1310 nm and receives at 1490 nm. This module must be deployed with the matchedGLC-BX40-D (TX1490nm / RX1310nm)on the opposite end of the fiber link. It supports DOM/DDM for real-time monitoring of optical operating parameters, suitable for metro backbone and campus network expansion when fiber pairs are limited.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Catalyst 2960, 3560, 3650, 3750, 3850, 4500, 6500, 6800, 9200, 9300; IE Industrial Switches; ISR 1100/4000 Series; ASR 1000; Wireless Controllers; Firepower appliances equipped with SFP slots.
Supported IOS / IOS XE Versions
All mainstream Cisco IOS and IOS XE releases supporting SFP and DOM functionality.
Supported Fiber Type
Single‑Mode Fiber (OS1/OS2, 9/125μm) only; incompatible with multi-mode fiber
Unsupported Platforms
GBIC-only slots, SFP+/SFP28/QSFP ports without adapters, MDS storage switches.
Critical Note:GLC-BX40-U cannot communicate with another GLC-BX40-U; pairing with GLC-BX40-D is mandatory.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable SFP (mini‑GBIC) compliant with SFP MSA & SFF‑8472(DOM)
Optical Interface
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Transmit Wavelength: 1310 nm
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Receive Wavelength: 1490 nm
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Connector: Simplex LC
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Data Rate: 1.25 Gbps wire‑speed Gigabit Ethernet
Maximum Transmission Reach
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Standard OS1/OS2 single‑mode fiber: Up to40 km
Optical Power Budget
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Transmit Power: -5 dBm ~ +3 dBm
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Receiver Sensitivity: Minimum -24 dBm
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Maximum Allowable Received Power: 0 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors module temperature, supply voltage, laser bias current, transmit optical power, receive optical power.
Environmental Operating Parameters (Commercial Grade)
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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, full‑duplex operation, 8b/10b line coding
Layer 2 Protocol Support
802.1Q VLAN trunking, 802.3x pause frame flow control, LACP, STP/RSTP/MSTP, EtherChannel link aggregation
Interface Diagnostics
Link status detection, packet error counters, DOM real-time optical telemetry, local loopback testing
High Availability
OIR hot‑swap capability on supported Catalyst chassis; link redundancy via spanning tree or port channels
Operations & Management
IOS / IOS XE CLI, SSH, SNMP v2c/v3, Syslog logging, DOM optical parameter polling
5. Typical Deployment Scenarios
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Metro and inter-campus fiber links with insufficient available fiber pairs
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Enterprise wide-area connections over leased dark single-mode fiber within 40 km
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Service provider FTTB and metro Ethernet access uplink deployments
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Network reconstruction projects to maximize utilization of existing single fiber strands
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Spare replacement transceiver for SFP‑based Cisco enterprise switching and routing 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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Standards: IEEE 802.3ah, SFP MSA, SFF‑8472
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Environmental: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco GLC-BX40-U 1000BASE‑BX40-U BiDi SFP Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Note: Simplex LC fiber patch cables and matched GLC-BX40-D transceiver are sold separately.
End-of-Sale Status
Cisco GLC-BX40-U remains active and available for new orders.
Pairing Reference:GLC-BX40-U ↔ GLC-BX40-D
Range comparison: GLC-BX10-U(10km) <GLC-BX40-U(40km)< GLC-BX80-U(80km)
UNSPSC Classification Code
43222618 – Cisco GLC-BX40-U 1000BASE-BX40-U BiDi single-fiber SFP optical transceiver with DOM, hot‑swappable Gigabit single-mode fiber module for Cisco enterprise switches and routers.
Hardware Warranty
Original Cisco units carry Cisco limited hardware warranty; refurbished units follow reseller warranty terms.
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