QSFP-40G-SR-BD Cisco (40GBase-SR-BD) Optical Transceiver

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QSFP-40G-SR-BD Cisco (40GBase-SR-BD) Optical Transceiver

Example Application

Platform Support

All FluxLight 40Gbase-SRBDs

Full downloadable spec sheet: QSFP-40G-SR-BD

FluxLight's QSFP-40G-SR-BD is a Cisco® compatible 40GBase QSFP+ Optical Transceiver and is factory preprogrammed with all the necessary configuration data for seamless network integration. Our transceivers perform identically to Cisco® original transceivers and are 100% compatible with other OEM and third party transceivers. The QSFP-40G-SR-BD is 100% MSA (Multi-Source Agreement) compliant. All FluxLight's transceivers are tested for 100% functionality and guaranteed compatible for outstanding network performance.

FluxLight offers all brands and form factors of Optical Transceivers for all your networking needs. Now you have a reliable, compatible and affordable means to expand your network while maintaining its integrity.

Example Application

SPECIAL CIRCUMSTANCES: FluxLight 40GBASE-SR-BD Optical Transceiver Application

Upgrading from 10G to 40G Using Existing Fiber

This application note presents a use case for a specialized QSFP+ 40G optical transceiver. The transceiver type is referred to as a 40GBASE-SR-BD, 40GBASE-SR-BX or 40GBASE-BIDI. What makes this transceiver special is, it is equipped with a LC Duplex optical connector and is specified for full-duplex 40GbE transmission over a single pair of OM3 fibers up to 100m or OM4 fiber up to 150m. The more common Short Reach (SR) multimode QSFP+ optical transceiver, the 40GBASE-SR4 type, is equipped with an MPO/MPT connector and is specified for full-duplex transmission over up to 100m of OM3 multimode ribbon fiber (MPO-12, 8 fibers of which are used).

Cisco QSFP-40G-SR-BD and QSFP-40G-SR

The scenario explored in this application note is the effectiveness and ease of an upgrading an existing 10GbE duplex multimode link to 40GbE in situations where running new fiber is difficult or cost prohibitive. In such cases, the 40GBASE-SR4 cannot be considered because it requires installation of an 8-fiber ribbon MMF cable.

For illustrative purposes two different brands of Ethernet switches, one designated a Spine switch and the other a Leaf switch are featured. In this scenario, previous switches, are being replaced by higher-capacity devices that are each equipped with QSFP+ ports. The existing switches were connected by 4 pairs of OM3 multimode fiber for a total full-duplex interconnect of 40Gbps. The new switches must interconnect at 40Gbps over those same 8 fibers for a new total of 160Gbps. The upgraded spine switch is a Cisco Nexus 9336PQ Switch and the leaf switch, an Extreme Networks X770-32q.

Spine Switch: Cisco Nexus 9336PQ ACI Spine Switch

The 9336PQ offers 36 full line-rate (40Gbps) QSFP+ ports for a total of 2.88Tbps of throughput. The switch is 2-rack-units (2RU = 3.5”) tall and mounts in a standard 19” equipment rack or bay. It is a fixed configuration, meaning it is a single configuration with no modularity. The Nexus 9336PQ is part of what Cisco refers to as its Application Centric Infrastructure (Cisco ACI) solution. Claiming this solution to be, “the industry’s most secure, open, and comprehensive Software-Defined Networking (SDN) solution.”

The Nexus 9h336PQ supports a range of AOC (Active Optical Cable) and DAC (Direct Attached Copper) interconnect cables lengths as well as following 40G QSFP+ transceiver options,

QSFP-40G-SR4                      QSFP+ SR4, 100m, OM3 MMF, MPO connector

QSFP-40G-CSR4                   QSFP+ CSR4, 300m OM3 MMF, MPO connector

WSP-Q40GLR4L                    QSFP+ LR4L, 2Km SMF, duplex LC connector

QSFP-40G-ER4                      QSFP+ 40Gb ER4, 40Km SMF, duplex LC connector

QSFP-40G-SR-BD                 QSFP+ 40Gb Bidirectional MMF, 100m OM3, duplex LC connector

QSFP-40G-LR4                      QSFP+ 40Gb LR4, 10km SMF, duplex LC connector

QSFP-4X10G-LR                   QSFP+ 40Gb PLR4, 10km SMF, MPO


Leaf SwitchExtreme Networks X770-32q

The X770-32q, a part of Extreme Networks’ Summit line of switches, is positioned as a high-density TOR switch to support the latest generation of rack-mounted servers with 10GbE and 40GbE connections. This X770 switch supports Layer 2/3 low-latency cut-through switching. The X770 includes 32 QSFP+ ports all capable of full-line rate 40Gbps traffic with a corresponding 2.56 Tbps of switching bandwidth. All QSFP+ slots are 10G/40G dual-speed capable.


The X770 supports a wide range of 40G and 10G optical transceivers. Supported 40G modules include:

10319   QSFP+ SR4 optical module, 100m, OM3, MPO connector

10326   QSFP+ Parallel Single Mode (PSM) LR4, SMF 10km, MPO connector

10334   QSFP+ LM4, 140m OM3 MMF, 1Km SMF, duplex LC connector

10335   QSFP+ 40Gb ER4, 40Km SMF, duplex LC connector

10329   QSFP+ 40Gb SR-BX, Bidirectional MMF, 100m OM3, duplex LC connector

10320   QSFP+ 40Gb LR4, 10km SMF, duplex LC connector


10G optical transceivers, accommodated by using Extreme’s QSFP+ to SFP+ adapter (PN: QSFFP-SFPP-ADPT) include:

10301 SFP+ 10GBASE-SR, 850nm, 300m on OM3 MMF, duplex LC

10302 SFP+ 10GBASE-LR, 1310nm, 10km, SMF, duplex LC

10309 SFP+ 10GBASE-ER, 1550nm, 40km, SMF, duplex LC

10310 SFP+ 10GBASE-ZR, 1550nm, 80km, SMF, duplex LC

10338 SFP+ 10GBASE-T, RJ45, 30m, CAT7


A range of Copper and Fiber Direct Attached Cables are also supported by the X770.


40GBASE-SR-BD Optical TransceiversFluxLight QSFP-40G-SR-BD and FluxLight 10329

FluxLight Cisco-compatible QSFP-40G-SR-BD QSFP+ 40GbE Optical Transceiver

FluxLight Cisco-compatible QSFP-40G-SR-BD QSFP+ 40GbE Optical Transceiver

FluxLight’s QSFP-40G-SR-BD is a Cisco® compatible 40GBase SFP+ Optical Transceiver and is factory pre-programmed with all the necessary configuration data for seamless network integration. These transceivers perform identically to Cisco® original transceivers, are 100% compatible and support full hot swapping operation. The QSFP-40G-SR-BD is 100% MSA (Multi-Source Agreement) compliant.

FluxLight Extreme-compatible 10329 QSFP+ 40GbE Optical Transceiver

The 10329 SFP+ optical transceiver from FluxLight is 100% equivalent to the Extreme Networks’ transceiver of the same part number. It is fully compatible with the Extreme X770 switch described in this note. Like all FluxLight optical transceivers, both the 10329 and the QSFP-40G-SR-BD are backed by FluxLight’s limited lifetime warranty.

Putting it all together

Putting this upgrade together is relatively simple, thanks to the 40GBASE-SR-BD optical transceivers. The old 10GbE switches may be removed, if there is some use for them, space may be found nearby for the new switches. Once installed, four compatible optical transceivers from FluxLight are inserted. Each pair of OM3 cables, previously connecting at 10Gbps, are now connected to the QSFP+ 40GbE modules.

Upgrading from 10G to 40G Using Existing Fiber

This example of a 10G to 40G upgrade using existing fiber was demonstrated using switches from Cisco and Extreme Networks. FluxLight offers the same 40GBASE-SR-BD technology in fully compatible QSFP+ modules for the OEM vendors listed below.

Brocade 40G-QSFP-SR-BIDI
Arista QSFP-40G-SRBD
Dell 407-BBXT
IBM 00YL631
Huawei QSFP-40G-SR-BD
Palo Alto Networks PAN-QSFP-40GBASE-SRBD
F5 Networks F5-UPG-QSFP+BD
Meraki MA-QSFP-40G-SR-BD


Platform Support for Cisco QSFP-40G-SR-BD

7600 Series Router Network Convergence System
Aggregation Services Routers NCS5000
ASR1000 NCS540
ASR9000 NCS5500
Catalyst Nexus
C3560X N2000
C3650 N3000
C3850 N5000
C4500 N6000
C6800 N7000
C9300 N9200
C9400 N9300
C9500 N9500
Firewalls Unified Computing System


FluxLight's Full Line of 40GBase-SRBD Transceivers

Warranty Information

Like all FluxLight products, this product this backed by a lifetime warranty, free email/phone technical support and advanced replacement (with RMA) and guaranteed emergency spares. See our warranty page for further details