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QSFP-40G-SR4-S (Cisco 40GBASE-SR4 QSFP+ Transceiver Module, 850nm/150m/MPO/MMF/DOM)

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QSFP-40G-SR4-S Overview

QSFP-40G-SR4-S uses a QSFP+ pluggable optical transceiver form factor with standardized module housing for Cisco QSFP module hardware ports. Its aggregate line-side data rate operates at 40 Gbps for the specified Ethernet hardware interface electrically. The optical media path uses multi-mode fiber across the module's specified parallel interface for supported links. The front interface presents an MPO-12 multifiber connector with twelve-fiber physical mating geometry for structured cabling. The transmit and receive wavelength operates within the 850 nm optical band specified for this SR4 module. The maximum link reach is 150 m at the longest qualified cabling distance for this hardware. The module carries the Commercial operating temperature class as its supported hardware temperature class. Digital optical monitoring support provides DOM access through the module management interface for operating parameter visibility.

With VCSEL transmitter technology, QSFP-40G-SR4-S converts parallel electrical input signals into four optical transmit lanes through a laser array. A PIN receiver architecture internally converts incoming parallel optical signals into host electrical outputs across four receive lanes. TX power range spans -7.6 dBm to 2.4 dBm per lane for average transmit output across all lanes. RX sensitivity reaches -9.5 dBm per lane as the minimum average receive power specification for each lane. RX overload point reaches 2.4 dBm per lane as the maximum average receive power specification for each lane. With 64b/66b encoding, the module aligns with 40GBASE-R physical coding behavior for Ethernet signaling across the interface. IEEE 802.3ba, SFF-8436, QSFP MSA, GR-20-CORE, GR-326-CORE, and GR-1435-CORE govern module compliance requirements. With 3.3V supply voltage, the host electrical interface follows the standard module power rail for active operation. At 1.5 W power consumption, the module stays within the documented QSFP cabling specification for powered optics.

Cisco Nexus 9000, Nexus 7000, Nexus 6000, Nexus 5000, and Nexus 3000 product families support this module. Additionally, Cisco Catalyst 9500, ASR 9000, NCS 5500, and UCS 6300 product families support this module. Data center leaf-spine fabrics, enterprise core layers, high-performance computing networks, and service provider edge platforms deploy this optic. OM4 and OM5 cable grades satisfy the longest documented cabling requirement for qualified short-reach installations. QSFP-40G-SR4-S is available from ORM Systems in new and certified refurbished condition for procurement teams. Certified refurbished stock passes ORM Systems optical inspection, port initialization checks, and serial verification before resale. Buy QSFP-40G-SR4-S from ORM Systems for Cisco refresh projects, spare pools, and lifecycle replacement orders. Check price online through ORM Systems to align budget timing with required delivery windows. Request a quote from ORM Systems when project quantities, condition preferences, or fulfillment timelines need confirmation. ORM Systems provides bulk quotation for enterprise and volume buyers.

QSFP-40G-SR4-S price is $323.58, a 84% saving from the Cisco list price of $2,022.36. QSFP-40G-SR4-S is in stock and available for next-day dispatch. (terms applied)

Request bulk order quote for QSFP-40G-SR4-S for additional pricing. Browse the full 40G Base Modules series or explore all Cisco products.

QSFP-40G-SR4-S Specifications

Product Type
Optical Transceiver
Brand
Cisco
Series
S-Class
Compatible OEM Part
N/A
Use Case
Data Center / Enterprise Campus / Service Provider
Form Factor
QSFP+
Data Rate
40 Gbps
Protocol
Ethernet
Fiber Type
Multi-Mode (MMF)
Connector Type
MPO-12
Wavelength TX
850 nm
Wavelength RX
850 nm
Reach
150 m (OM4/OM5)
Cable Standard
OM3 / OM4 / OM5
Transmitter Type
VCSEL
Receiver Type
PIN
TX Power Min
-7.6 dBm
TX Power Max
2.4 dBm
RX Sensitivity
-9.5 dBm
RX Power Max
2.4 dBm
Encoding
64b/66b
Supported Standards
IEEE 802.3ba / SFF-8436 / QSFP MSA / GR-20-CORE / GR-326-CORE / GR-1435-CORE
DDM/DOM Support
Yes
Power Consumption
1.5 W
Supply Voltage
3.3V
Operating Temperature
Commercial (0°C to 70°C)
Compatible Platforms
Cisco Catalyst 9500 / Cisco Nexus 9000 / Cisco Nexus 7000 / Cisco Nexus 6000 / Cisco Nexus 5000 / Cisco Nexus 3000 / Cisco ASR 9000 / Cisco NCS 5500 / Cisco UCS 6300
Certifications
RoHS
Height
13.5 mm
Width
18.4 mm
Depth
72.4 mm
Weight
0.1 kg

QSFP-40G-SR4-S Use Case

Leaf to Spine Short-Reach Fabric

The QSFP-40G-SR4-S operates as a native 40 Gigabit link between leaf and spine switches inside a short-reach fabric. The QSFP+ module uses four 850 nm multimode lanes over a 12-fiber MPO/MTP connection, supporting 100 m on OM3 and 150 m on OM4 or OM5 laser-optimized fiber. Engineers cable QSFP+ ports directly through parallel-fiber trunks and configure the link as routed underlay or fabric port-channel between tiers. The fabric gains predictable 40G east-west capacity within the data hall while preserving the planned leaf-spine hierarchy.

Server Access Aggregation Uplink

QSFP-40G-SR4-S fits server access aggregation where top-of-rack switches uplink to an aggregation pair over structured multimode fiber. The 40GBASE-SR4 interface runs on MPO-12 parallel MMF, with four optical lanes carrying the aggregate 40 Gigabit connection across OM3, OM4, or OM5 cabling within the Cisco reach profile. The top-of-rack configuration sends routed underlay links, storage VLAN trunks, or MLAG peer-facing traffic toward aggregation. The access aggregation tier gains a short-reach 40G uplink without changing the installed parallel-fiber patching model or switch hierarchy.

Data Hall Cross-Connect Link

In a data hall cross-connect, the QSFP-40G-SR4-S links two QSFP+ switch ports through MPO/MTP patch panels and parallel multimode trunks. The 850 nm SR4 optic keeps the run inside the supported 100 m OM3 or 150 m OM4/OM5 distance, and the switch configuration treats the circuit as a single 40G Ethernet link. Operations teams document lane polarity, MPO type, and optical readings during turn-up to prevent cross-connect errors. The cross-connect gains a defined short-reach 40G circuit across the structured cabling plant.

Quality Certifications

To get the detailed certification, please go to the Compliance Center.

ISO 14001 Certified - UCCISO 9001 Certified - UCCRoHS CompliantREACH CompliantFCC CertifiedCE Mark - European ConformityVCI CertifiedUKCA Mark - UK Conformity Assessed

Product Comparison Table

40GBASE-SR4 QSFP Trnscvr Module, MPO Conn, Enterprise-ClassQSFP-40G-SR4-S40GBASE Active Optical QSFP to 4SFP breakout Cable, 7mQSFP-4X10G-AOC7M
Product TypeOptical TransceiverTransceiver
Form FactorQSFP+QSFP
Data Rate40 Gbps4x10G
Connector TypeMPO-12Direct Attach
WavelengthN/A
Transmission DistanceShort-Range
Fiber TypeMulti-Mode (MMF)Multi-mode
Max Distance7 meters
Supported ProtocolsEthernet
Network InterfaceEthernet
Power Consumption1.5 WN/A
Operating TemperatureCommercial (0°C to 70°C)0 to 70°C
Storage Temperature-40 to 85°C
Input Voltage3.3V
CompatibilityCisco / Juniper / Huawei / Arista
Product NameQSFP-4X10G-AOC7M=
Height13.5 mmN/A
Width18.4 mmN/A
Depth72.4 mmN/A
Weight0.1 kgN/A

Reviews & Ratings

P
Patrick Doyle
4

Reliable 40G SR4 optics for multimode fiber deployments.

K
Kevin Russell
4

Plug-and-play installation with stable throughput.

B
Brian Adams
5

Works well for aggregation layer connections.

J
Jason Grant
5

Consistent performance in high-density environments.

M
Mark Collins
5

Dependable optics for enterprise networks.

Questions & Answers

What connector type does the QSFP-40G-SR4-S use?

The module uses a 12-fiber MPO/MTP connector for parallel optics, enabling four 10 Gbps lanes.

What is the Cisco QSFP-40G-SR4-S?

The Cisco QSFP-40G-SR4-S is a 40 Gigabit QSFP+ transceiver module for short-reach connections over multimode fibre. It uses four parallel 850nm optical lanes to deliver 40G aggregate throughput over MPO-connected OM3 or OM4 multimode fibre, reaching up to 100 metres on OM3 and 150 metres on OM4. The module includes DOM support and is widely deployed in data centres for high-speed short-reach switch-to-server and switch-to-switch connections.

What does SR4 mean in QSFP-40G-SR4-S?

SR stands for Short Reach, the IEEE designation for short-distance multimode fibre operation at 850nm. The 4 indicates four parallel optical lanes, each carrying 10 Gbps, which together provide 40 Gbps aggregate throughput. The S suffix, consistent with other Cisco S-variant modules such as the SFP-10G-LR-S, indicates the module was produced by a specific Cisco-approved manufacturing source. The QSFP-40G-SR4-S is functionally identical to the QSFP-40G-SR4 on supported Cisco platforms.

Is the QSFP-40G-SR4-S a genuine Cisco product?

Yes, the QSFP-40G-SR4-S is a genuine Cisco-branded module. The S suffix indicates a Cisco-approved manufacturing source, the same convention used for the SFP-10G-LR-S and other S-variant Cisco optics. It carries Cisco firmware encoding, operates without triggering third-party optic warnings on Cisco hardware, and is covered under Cisco's standard hardware warranty. It is not a compatible or clone module; it is an authentic Cisco product from a specific approved supply chain source

Where does the QSFP-40G-SR4-S sit in Cisco's 40G optics range?

The QSFP-40G-SR4-S is the short-reach multimode variant of Cisco's 40G QSFP+ optics. It is paired with the QSFP-40G-LR4 for 10km single-mode applications and the QSFP-40G-ER4 for 40km extended-reach scenarios. For intra-data-centre connections within 150 metres where MPO-cabled OM3 or OM4 multimode infrastructure is installed, the QSFP-40G-SR4-S is the standard Cisco 40G short-reach choice.

What data rate does the QSFP-40G-SR4-S support?

The QSFP-40G-SR4-S delivers 40 Gigabit Ethernet throughput by aggregating four parallel 850nm optical lanes, each carrying 10.3125 Gbps, for 40GbE aggregate per the IEEE 802.3ba 40GBASE-SR4 specification. The four-lane parallel architecture is handled internally; the host Cisco platform presents this as a single 40G interface. Full 40G throughput is available up to the maximum rated reach of 100m on OM3 or 150m on OM4 multimode fibre.

What is the maximum reach of the QSFP-40G-SR4-S on OM3 and OM4 fibre?

The QSFP-40G-SR4-S reaches up to 100 metres on OM3 (50/125 micron) multimode fibre and up to 150 metres on OM4 (50/125 micron) multimode fibre. OM1 and OM2 multimode fibre types are not rated for reliable 40GBASE-SR4 operation and should not be used with this module. For most data centre and server room deployments where OM3 or OM4 MPO cabling is standard, the reach envelope covers all typical rack-to-rack and row-to-row connection distances.

What fibre and cable type does the QSFP-40G-SR4-S require?

The QSFP-40G-SR4-S requires OM3 or OM4 50-micron multimode fibre terminated with MPO connectors. An MPO-12 (12-fibre) ribbon cable is typically used, with 4 fibres carrying the four transmit lanes and 4 fibres carrying the four receive lanes, leaving 4 dark. MPO-8 cables are also compatible. Correct cable polarity must be observed to align transmit and receive lanes properly at both ends. OM1 and OM2 fibre are not rated for reliable 40GBASE-SR4 operation.

Does the QSFP-40G-SR4-S support Digital Optical Monitoring?

Yes, DOM support is confirmed in the product name. The QSFP-40G-SR4-S provides real-time optical diagnostics including per-lane transmit power for each of the four 850nm channels, aggregate receive power, module temperature, laser bias current, and supply voltage. Per-lane monitoring allows engineers to identify if an individual optical lane has degraded or failed, which is particularly useful in dense data centre deployments where diagnosing a single-lane fault quickly minimises downtime.

What wavelength does the QSFP-40G-SR4-S use?

The QSFP-40G-SR4-S uses 850nm across all four parallel transmit and receive lanes. Each lane uses a separate VCSEL (Vertical Cavity Surface Emitting Laser) operating at 10 Gbps, with a dedicated photodetector on the receive side. The 850nm wavelength is consistent with OM3 and OM4 multimode fibre optimisation and is the same wavelength used by 10GBASE-SR and 1000BASE-SX modules, confirming compatibility with the same multimode fibre cabling infrastructure used throughout the data centre.

What is the QSFP-40G-SR4-S used for?

The QSFP-40G-SR4-S is used for 40 Gigabit short-reach connections in data centres and server rooms where MPO-cabled OM3 or OM4 multimode fibre is installed. Common deployments include top-of-rack switch to spine switch uplinks, 40G server NIC to switch connections, aggregation switch interconnects, and any link requiring 40G throughput within 150 metres where MPO multimode cabling is the installed medium and a single 40G logical connection is operationally preferred.

Is the QSFP-40G-SR4-S suitable for data centre top-of-rack deployments?

Yes, top-of-rack to spine switch connections are a primary use case. These links use short MPO-cabled OM3 or OM4 runs well within the 100-150 metre reach. The 40G bandwidth from the QSFP-40G-SR4-S aggregates traffic from multiple 10G server downlinks on the same top-of-rack switch into a high-bandwidth single uplink, avoiding the port overhead of running multiple individual 10G uplinks. This is a standard data centre design pattern in Cisco Nexus environments.

Can the QSFP-40G-SR4-S be used in breakout mode to create four 10G connections?

Yes, on compatible Cisco platforms the QSFP-40G-SR4-S supports breakout mode using an MPO-to-4xLC breakout cable. Each of the four 10G lanes connects to a separate 10G SFP+ port on the far-end device. This allows one 40G QSFP+ port to serve four independent 10G devices simultaneously, improving port efficiency on high-density switches. Breakout mode requires platform-level configuration on the Cisco host device, and not all QSFP+ ports on all platforms support it.

Is the QSFP-40G-SR4-S suitable for 40G server connectivity in a small data centre?

Yes, the QSFP-40G-SR4-S is a practical choice for 40G server-to-switch connections in small data centres where servers are equipped with 40G QSFP+ NICs and OM3 or OM4 MPO cabling is installed. Hypervisor hosts and storage servers running NVMe-over-Fabric or high VM-density workloads benefit from 40G uplinks. The QSFP-40G-SR4-S provides a cost-effective entry point for 40G server connectivity in environments already built on Cisco Nexus or Catalyst switching platforms.

What Cisco platforms support the QSFP-40G-SR4-S?

The QSFP-40G-SR4-S is compatible with Cisco Nexus 5000, 6000, 7000, and 9000 series data centre switches, ASR 1000 and 9000 series routers, Catalyst 9400, 9500, and 9600 series with 40G-capable line cards, and Cisco UCS 6200 and 6300 series fabric interconnects. Platform and line card compatibility varies; always verify against Cisco's transceiver compatibility matrix for your specific chassis, supervisor, and line card before ordering.

What MPO cabling is needed to use the QSFP-40G-SR4-S?

The QSFP-40G-SR4-S requires OM3 or OM4 multimode fibre terminated with MPO-12 connectors. Cable polarity must be configured correctly to align the transmit and receive lanes at both ends of the link. For breakout to four 10G connections, an MPO-to-4xLC breakout cable with OM3 or OM4 fibre is required. MPO cabling installation requires attention to polarity type, which should be confirmed against the specific link setup before cable procurement.

Is the QSFP-40G-SR4-S compatible with QSFP-40G-SR4 (non-S) on the same link?

Yes, the QSFP-40G-SR4-S and QSFP-40G-SR4 are fully optically interoperable. Both operate at 850nm over OM3/OM4 multimode fibre with MPO connectors conforming to IEEE 802.3ba 40GBASE-SR4. An SR4-S at one end and an SR4 at the other works without any optical incompatibility, provided both are in supported Cisco platforms and the MPO cable polarity is correct. The S suffix is only a supply chain designation and has no effect on optical interoperability.

Can the QSFP-40G-SR4-S link with 40GBASE-SR4 modules from other vendors?

Yes, at the optical link layer. The QSFP-40G-SR4-S conforms to IEEE 802.3ba 40GBASE-SR4, which is a standard specification. The module can establish a 40G link with any 40GBASE-SR4 compliant module at the far end, regardless of that module's vendor, as long as the far-end module is correctly encoded for its own host platform and both ends use compatible MPO OM3 or OM4 cabling with correct polarity. The Cisco QSFP-40G-SR4-S must be in a Cisco host platform.

What is the difference between QSFP-40G-SR4-S and QSFP-40G-LR4?

The QSFP-40G-SR4-S uses parallel 850nm optics with an MPO connector over OM3/OM4 multimode fibre up to 150 metres. The QSFP-40G-LR4 uses 4-channel LAN-WDM with a duplex LC connector over OS2 single-mode fibre up to 10 kilometres. They serve entirely different fibre types, distances, and connector standards. The SR4-S is for dense short-reach data centre links; the LR4 is for long-reach campus or DCI connections on single-mode infrastructure.

What is the difference between QSFP-40G-SR4-S and QSFP-40G-SR4?

The QSFP-40G-SR4-S and QSFP-40G-SR4 are functionally identical. Both are genuine Cisco 40GBASE-SR4 modules at 850nm over multimode fibre with the same reach and DOM support. The S suffix only identifies the specific Cisco-approved manufacturing source. They are fully interoperable on the same link and can be used interchangeably on supported Cisco platforms. Either may be listed in Cisco's compatibility matrix for a given platform depending on the IOS or NX-OS version.

How does the QSFP-40G-SR4-S compare to the QSFP-40G-ESR4?

The QSFP-40G-ESR4 (Extended Short Reach) extends reach to approximately 300 metres on OM3 and 400 metres on OM4, well beyond the 100m and 150m limits of the QSFP-40G-SR4-S. Both use 850nm parallel optics with MPO connectors over multimode fibre. For standard intra-data-centre distances within 150m, the QSFP-40G-SR4-S is sufficient. For longer multimode runs such as inter-floor or inter-building connections within a campus using existing OM3 or OM4 infrastructure, the QSFP-40G-ESR4 is the appropriate upgrade.

Should I use a QSFP-40G-SR4-S or four SFP-10G-SR modules for a 40G connection?

A single QSFP-40G-SR4-S uses one MPO cable and one QSFP+ port for 40G. Four SFP-10G-SR modules require four SFP+ ports and four separate LC fibre pairs totalling 8 fibre strands, consuming the same total fibre count but using four times the port count. The QSFP-40G-SR4-S is the more port-efficient choice when the host platform supports QSFP+ slots and a single 40G logical interface is the correct design. Use four 10G links when separate logical paths or platform constraints require it.

Is the QSFP-40G-SR4-S available new and refurbished?

Yes, the QSFP-40G-SR4-S is available in both new and certified refurbished condition from ORM Systems. Refurbished units are tested before dispatch, with all four 850nm optical lanes verified for correct transmit power and DOM functionality confirmed. Refurbished 40G QSFP modules are a cost-effective option for data centre deployments where Cisco hardware quality is required at a lower capital outlay than new stock.

What is the price of the QSFP-40G-SR4-S?

QSFP-40G-SR4-S modules carry a higher unit price than 10G SFP+ equivalents, though 40GBASE-SR4 pricing has fallen significantly as the technology has matured. ORM Systems offers competitive pricing on new and refurbished stock with volume discounts available. Check the QSFP-40G-SR4-S product page on ormsystems.com or contact the sales team for a quote, particularly for bulk data centre orders where volume pricing applies.

Is the QSFP-40G-SR4-S still available as an active product?

Yes, the QSFP-40G-SR4-S remains actively stocked at ORM Systems in both new and refurbished condition. 40GBASE-SR4 infrastructure continues to operate extensively across enterprise and cloud data centres, and replacement modules remain in consistent demand. ORM Systems maintains inventory to support both ongoing maintenance of existing 40G Cisco deployments and new installations where SR4 over MPO multimode infrastructure is specified.

Can I order the QSFP-40G-SR4-S in bulk from ORM Systems?

Yes, ORM Systems handles bulk orders for the QSFP-40G-SR4-S with volume pricing for larger quantities. Data centre builds and network refreshes frequently require multiple 40G SR4 modules. Contact the ORM Systems sales team or use the bulk quotation form on the product page with your required quantity, delivery details, and project timeline for a dedicated pricing proposal.

What are the lead times for the QSFP-40G-SR4-S from ORM Systems?

Lead times depend on current stock availability and delivery region. ORM Systems ships from UK, USA, UAE, and Netherlands locations. For bulk orders or project-critical timelines, confirm availability with the ORM Systems sales team before placing your order to ensure stock levels can meet your requirement within your installation schedule.

What warranty does the QSFP-40G-SR4-S come with from ORM Systems?

New Cisco QSFP-40G-SR4-S units carry the standard Cisco hardware warranty. Refurbished units sold by ORM Systems are covered by the ORM Systems warranty against hardware defects identified after delivery. For specific warranty terms applicable to your order condition, check the product listing on ormsystems.com or contact ORM Systems before purchasing.

Is a refurbished QSFP-40G-SR4-S tested before dispatch?

Yes, refurbished QSFP-40G-SR4-S units at ORM Systems are tested before dispatch. All four parallel 850nm transmit lanes and the receive path are tested for correct optical power output within Cisco's specification, DOM data is verified as accessible and accurate, and the module and MPO connector are confirmed to be physically undamaged. Each lane is tested individually to confirm the full module is performing correctly before release.

What certifications does the QSFP-40G-SR4-S carry?

The Cisco QSFP-40G-SR4-S meets FCC Class A and CE electromagnetic compatibility standards and is RoHS compliant. It conforms to IEEE 802.3ba 40GBASE-SR4 and the QSFP Multi-Source Agreement. These certifications confirm the module meets regulatory requirements for UK, EU, and US markets and is suitable for deployment in enterprise, cloud, and regulated data centre environments.

How do I install the QSFP-40G-SR4-S in a Cisco switch?

Insert the QSFP-40G-SR4-S into a compatible QSFP+ slot with the locking tab aligned until the module seats firmly. Remove the dust cap and connect the OM3 or OM4 MPO cable. The Cisco device detects the module automatically. Confirm via "show interfaces" or "show inventory." If the link does not come up, check MPO cable polarity first as incorrect polarity is the most common installation issue with SR4 modules. Verify per-lane optical power via "show interfaces transceiver detail" on platforms supporting per-lane DOM.

Does breakout mode on the QSFP-40G-SR4-S require special configuration?

Yes, breakout mode requires platform-level configuration on the Cisco host device. On Nexus platforms this is typically configured via a breakout interface map command specific to that platform's NX-OS version. The physical side requires an MPO-to-4xLC breakout cable. Not all QSFP+ ports on all Cisco platforms support breakout mode, so verify capability in the platform configuration guide before purchasing breakout cables or designing the deployment around this function.

Does the QSFP-40G-SR4-S require a licence to operate?

No, the QSFP-40G-SR4-S does not require a transceiver-specific licence. It activates automatically when inserted into a compatible Cisco QSFP+ port. Cisco platform licensing applies to software features and in some cases to port-count expansion licences on specific platforms, not to the physical transceiver module. Standard 40GbE operation using the QSFP-40G-SR4-S does not require licence activation beyond the normal interface configuration.

Where can I buy the QSFP-40G-SR4-S in the UK?

The QSFP-40G-SR4-S is available from ORM Systems at ormsystems.com. ORM Systems is a UK-based B2B hardware reseller with UK fulfilment, providing genuine Cisco 40G SR4 modules for data centre and enterprise deployments. Both new and refurbished units are listed with competitive pricing, and the sales team handles bulk procurement for larger infrastructure projects.

Does ORM Systems ship the QSFP-40G-SR4-S internationally?

Yes, ORM Systems ships the QSFP-40G-SR4-S internationally from fulfilment locations in the UK, USA, UAE, and Netherlands. Contact the ORM Systems sales team for delivery timelines and import documentation requirements specific to your country before placing an international order.