Cisco GLC-BX40-U-I Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 1000BASE-BX40-U Industrial Temperature Bi-Directional Single Fiber SFP Optical Transceiver Module with DOM Support
SKU:GLC-BX40-U-I
Naming Breakdown
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GLC: Gigabit Small Form-Factor Pluggable Transceiver (SFP / mini-GBIC)
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BX: Bi-directional single-strand fiber WDM transmission
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40: Maximum transmission reach of 40 kilometers over single-mode fiber
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U: Upstream; Transmit 1310 nm / Receive 1550 nm
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I: Industrial wide-temperature grade (-40°C ~ +85°C)
Core Product Positioning
The Cisco GLC-BX40-U-I is a hot‑swappable industrial-grade BiDi SFP transceiver designed for Gigabit Ethernet communications. Utilizing wavelength division multiplexing (WDM), it supports full-duplex 1.25Gbps data transmission overone single strand of single-mode fiber (SMF). This transceivermust be paired with complementary GLC-BX40-D-I (1550nm-TX / 1310nm-RX)deployed at the remote terminal to establish valid bidirectional fiber links. Built for harsh unconditioned operating environments, the industrial temperature rating enables reliable operation inside outdoor cabinets, power substations, railway sites and remote industrial facilities. Integrated DOM/DDM functionality enables continuous real-time monitoring of optical performance parameters.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Catalyst IE2000, IE3300, IE3400, IE4000, IE9300 Industrial Rugged Switches; Catalyst 2960, 3650, 3850, 9200, 9300; ASR 901, ASR 903, ASR1000 Series Routers; Firepower appliances equipped with Gigabit SFP slots.
Supported IOS / IOS XE Versions
All mainstream Cisco IOS and IOS XE releases supporting SFP MSA specification and SFF‑8472 DOM diagnostic functions.
Supported Fiber Type
Single‑Mode Fiber (OS1 / OS2, G.652, 9/125μm) only; incompatible with multimode fiber.
Unsupported Platforms
SFP+/SFP28/QSFP ports without adapters, legacy GBIC-only interfaces, MDS storage switches.
Critical Note: Two GLC-BX40-U-I modules cannot interconnect directly. Pairing with GLC-BX40-D-I is mandatory. For short fiber spans with low link attenuation, deploy inline optical attenuators to avoid receiver overload.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable SFP (mini‑GBIC), compliant with SFP MSA & SFF‑8472 (DOM support)
Optical Interface
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Transmit Wavelength: 1310 nm nominal (1260 ~ 1360 nm), DFB Laser
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Receive Wavelength: 1550 nm nominal (1480 ~ 1600 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 Optical Power: -5 dBm ~ +3 dBm
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Receiver Sensitivity: Minimum -25 dBm
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Maximum Allowable Received Power: +3 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors module internal temperature, supply voltage, laser bias current, transmit optical power and receive optical power.
Environmental Operating Parameters (Industrial Grade)
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Operating Temperature:-40°C ~ +85°C (-40°F ~ 185°F)
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Storage Temperature: -40°C ~ +85°C (-40°F ~ 185°F)
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Relative Humidity: 5% – 95%, 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 full-duplex transmission, 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, error counters, DOM real-time optical telemetry, local loopback testing
High Availability
OIR online insertion and removal on supported 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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Power substation, oil & gas, factory automation long-distance single-fiber interconnections
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Railway, highway roadside and remote unmanned site communication infrastructure
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4G/5G cellular base station backhaul fiber links
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Metro enterprise Gigabit networking and FTTx broadband access deployments
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Network renovation projects to save single-mode fiber resources
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Spare replacement transceiver for Cisco industrial and enterprise switching/routing platforms
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
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Laser Safety: Class 1 Laser Product per IEC 60825‑1
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Industry Standards: IEEE 802.3z, 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-I 1000BASE‑BX40-U Industrial BiDi SFP Optical Transceiver
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Hardware installation guide
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Safety and regulatory documentation
Note: Simplex LC single-mode fiber patch cables and optical attenuators (for short-distance links) are sold separately. Must deploy matching GLC-BX40-D-I on the opposite fiber terminal.
End-of-Sale Status
Cisco GLC-BX40-U-I remains active and available for new orders.
Model Distinction Reference
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GLC-BX40-U: Commercial grade, 0°C ~ +70°C
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GLC-BX40-U-I: Industrial grade, -40°C ~ +85°C
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Mandatory pairing partner:GLC-BX40-D-I (1550nm-TX / 1310nm-RX)
UNSPSC Classification Code
43222618 – Cisco GLC-BX40-U-I 1000BASE-BX40-U industrial BiDi single-strand single-mode SFP transceiver with DOM, hot‑swappable Gigabit optical module for Cisco industrial and enterprise switches and routers.
Hardware Warranty
Original Cisco units carry Cisco limited hardware warranty; refurbished units follow reseller warranty terms.
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