Cisco QSFP-40G-SR-BD Full Official Product Description
Part Number:QSFP-40G-SR-BD(Short alias: QSFP-40G-SRBD; Industry alias: QSFP-40G-BIDI). Must deploy in matched transceiver pairs. Interoperability with non-BiDi 40G optics is not supported.
1. Part Number & Naming Definition
Official Full Name
Cisco 40GBASE-SR-BD QSFP+ Bidirectional Short-Reach Multi-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:QSFP-40G-SR-BD
Naming Breakdown
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QSFP+: Quad Small Form-factor Pluggable hot‑swappable transceiver compliant with SFF‑8436 QSFP+ MSA specification
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40G: Aggregate 41.2 Gbps bandwidth for 40 Gigabit Ethernet (4 × 10.3125 Gbps electrical lanes)
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SR: Short Reach for multi-mode fiber transmission
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BD: Bidirectional (BiDi) wavelength division multiplexing technology
Core technology: Converts 4-lane 40G electrical signal into two bidirectional 20G optical channels, transmitting full-duplex 40G traffic over a single duplex LC two-strand multi-mode fiber pair. Enables network operators to upgrade legacy 10G LC duplex fiber infrastructure to 40G without replacing cabling or deploying MPO ribbon fiber.
Critical Limitation:4×10G breakout function NOT supported.
Core Product Positioning
The Cisco QSFP-40G-SR-BD is a commercial-grade hot‑swappable QSFP+ bidirectional optical transceiver designed for short-reach 40 Gigabit Ethernet transmission over laser-optimized multi-mode fiber. It is optimized for leaf-spine data center fabric upgrades, top-of-rack switch uplink migration, cloud data center interconnections and enterprise server room expansion projects. Integrated DOM/DDM provides continuous real-time monitoring of key optical operational parameters.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 7000 / 9000 Series Switches; Catalyst 9000 Series Switches; ASR 1000 Series Routers; UCS Fabric Interconnects and other network hardware equipped with QSFP+ ports supporting 40 Gigabit Ethernet.
Verify the official Cisco transceiver compatibility matrix and minimum required firmware release before deployment.
Supported Operating Systems
NX-OS, IOS-XE releases supporting QSFP+ MSA and SFF‑8472 digital diagnostic monitoring functions.
Supported Fiber Media
Laser-optimized 50/125μm multi-mode fiber (MMF) only.Not compatible with single-mode fiber.
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OM3 MMF: Maximum reach 100 meters
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OM4 / OM5 MMF: Maximum reach 150 meters
Connector Type
Duplex LC UPC optical connector
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP+, compliant with SFF‑8436 MSA
Optical Interface
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BiDi Wavelength Pair: 850 nm / 905 nm
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Electrical Lane Rate: 4 × 10.3125 Gbps, aggregate 41.2 Gbps (40GBASE Ethernet)
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Operating Mode: Native 40G only; breakout function disabled
Maximum Transmission Distance
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OM3 Multi-Mode Fiber: Up to 100 m
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OM4 / OM5 Multi-Mode Fiber: Up to 150 m
Optical Power Budget
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Average Transmit Optical Power: -4.0 dBm ~ +2.5 dBm
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Minimum Receiver Sensitivity: -11.0 dBm
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Maximum Allowable Received Optical Power: +0.5 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors internal module temperature, supply voltage, laser bias current, transmit optical power and receive optical power.
Environmental Specifications (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: 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 full-duplex native 40GBASE-SR-BD Ethernet;4×10G breakout mode unavailable
Layer 2 Protocol Support
802.1Q VLAN trunking, IEEE 802.3x pause frame flow control, LACP, STP/RSTP/MSTP, EtherChannel link aggregation
Interface Diagnostics
Link status detection, error statistics, DOM real-time optical telemetry, LOS (Loss of Signal) alarm indication, Tx disable control, local loopback testing
High Availability
Supports hot-plug OIR (Online Insertion and Removal) on compatible platforms; supports link redundancy via port-channels and spanning tree protocols
Operations & Management
NX-OS / IOS-XE command-line interface, SSH, SNMP v2c/v3, Syslog logging
5. Typical Deployment Scenarios
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10G to 40G data center migration reusing existing duplex LC multi-mode fiber without recabling
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Short-distance 40GE inter-switch uplinks within leaf-spine data center fabrics
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Aggregation uplink upgrades for top-of-rack switches inside server rooms
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Cost-saving fiber infrastructure reuse projects for cloud and enterprise data centers
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HPC cluster interconnections where MPO ribbon fiber deployment is impractical
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 conforming to IEC 60825‑1
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Industry Standards: SFF‑8436, SFF‑8472
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco QSFP-40G-SR-BD QSFP+ Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
Duplex LC multi-mode fiber patch cables are sold separately. This transceiver cannot interoperate with QSFP-40G-SR4 and other non-BiDi 40G optical modules.
Model Comparison Reference
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QSFP-40G-SR-BD: Duplex LC MMF BiDi, 100m/150m, native 40G only, no breakout
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QSFP-40G-SR4: MPO-12 parallel multi-mode optics, supports optional 4×10G breakout
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QSFP-40G-CSR4: Extended-reach MPO multi-mode QSFP+ transceiver
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QSFP-40G-LR4: Duplex LC single-mode 10km CWDM QSFP+ module
UNSPSC Classification Code
43222618 – Cisco QSFP-40G-SR-BD bidirectional short-reach multi-mode QSFP+ transceiver with DOM, hot-swappable 40 Gigabit optical module for economical data center migration leveraging existing duplex LC fiber infrastructure.
Hardware Warranty
Genuine Cisco transceivers are covered under Cisco limited hardware warranty. Warranty terms for refurbished units follow respective reseller agreements.
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