Cisco QSFP-40G-SR-BD (Common Name: QSFP-40G-BIDI) Full Official Product Description
Important Notice: The formal Cisco part number isQSFP-40G-SR-BD. QSFP-40G-BIDI is the widely adopted industry alias. Transceivers must be deployed in matched pairs. Interoperation with non-BiDi 40G optics is not feasible.
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 (Industry Alias: QSFP-40G-BIDI)
Naming Breakdown
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QSFP+: Quad Small Form-factor Pluggable hot-swappable transceiver complying with SFF-8436 QSFP+ MSA specification
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40G: Supports aggregate 41.2 Gbps bandwidth for 40 Gigabit Ethernet
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SR: Short-reach specification for multi-mode fiber transmission
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BD / BIDI: Bidirectional single-fiber-pair WDM optical technology
Core principle: Two independent 20G bidirectional optical channels operate over one duplex LC two-strand multi-mode fiber cable. It enables 40G transmission over legacy LC duplex MMF cabling originally deployed for 10GBASE-SR.
Key Restriction:4×10G breakout capability is NOT supported.
Core Product Positioning
The Cisco QSFP-40G-SR-BD is a hot-swappable commercial-grade QSFP+ bidirectional optical transceiver designed for short-reach 40 Gigabit Ethernet over laser-optimized multi-mode fiber. It addresses critical data center upgrade challenges by allowing operators to upgrade existing 10G LC duplex fiber links to 40G without cable replacement or MPO ribbon fiber deployment. Ideal for leaf-spine fabric migration, ToR switch uplink upgrades, cloud data center interconnections and enterprise server room expansion projects. Integrated DOM/DDM enables 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 hardware equipped with QSFP+ ports supporting 40 Gigabit Ethernet.
Please validate via the official Cisco transceiver compatibility matrix and minimum required firmware version before deployment.
Supported Operating Systems
NX-OS, IOS-XE with QSFP+ MSA and SFF-8472 digital diagnostic monitoring support
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 of 100 meters
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OM4 / OM5 MMF: Maximum reach of 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 Rate: 4 × 10.3125 Gbps lanes, aggregate 41.2 Gbps for 40GBASE Ethernet
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Operation 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 monitoring, error counters, 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 not practical
6. Regulatory & Compliance Certifications
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Safety Standard: 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 (QSFP-40G-BIDI): Duplex LC MMF BiDi, 100m/150m, native 40G only, no breakout
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QSFP-40G-SR4: MPO-12 parallel multi-mode optics, optional 4×10G breakout support
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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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