Cisco GLC-BX40-D-I Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 1000BASE-BX40-D Industrial Temperature Bi-Directional Single Fiber SFP Optical Transceiver Module with DOM Support
SKU:GLC-BX40-D-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 reach of 40 kilometers over single-mode fiber
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D: Downstream; Transmit 1550 nm / Receive 1310 nm
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I: Industrial wide temperature grade (-40°C ~ +85°C)
Core Product Positioning
The Cisco GLC-BX40-D-I is a hot‑swappable industrial-grade BiDi SFP transceiver for Gigabit Ethernet. It utilizes WDM technology to achieve full-duplex 1.25Gbps communication overone single strand of single-mode fiber. This modulemust be paired with complementary GLC-BX40-U-I (1310nm-TX / 1550nm-RX)on the opposite end to establish valid bidirectional links. Built for harsh unconditioned environments, the industrial temperature specification suits power substations, railway communications, outdoor roadside sites and remote industrial facilities. Integrated DOM/DDM enables continuous real-time optical parameter monitoring.
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 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-D-I modules cannot interconnect directly. Pairing with GLC-BX40-U-I is mandatory.
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: 1540 nm ~ 1560 nm (1550 nm nominal, DFB Laser)
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Receive Wavelength: 1260 nm ~ 1360 nm (1310 nm nominal)
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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 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 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-D-I 1000BASE‑BX40-D 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 are sold separately. Must deploy matching GLC-BX40-U-I on the opposite fiber terminal.
End-of-Sale Status
Cisco GLC-BX40-D-I remains active and available for new orders.
Model Distinction Reference
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GLC-BX40-D: Commercial grade, 0°C ~ +70°C
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GLC-BX40-D-I: Industrial grade, -40°C ~ +85°C
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Mandatory pairing partner:GLC-BX40-U-I (1310nm-TX / 1550nm-RX)
UNSPSC Classification Code
43222618 – Cisco GLC-BX40-D-I 1000BASE-BX40-D 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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