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QSFP-40G-LR4 (Cisco 40GBASE-LR4 QSFP+ Transceiver Module, 10km/LC/SMF/OTN/4-Channel WDM)

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QSFP-40G-LR4 Overview

QSFP-40G-LR4 uses a QSFP+ hot-swappable pluggable optical transceiver form factor for Cisco 40 Gigabit Ethernet QSFP module ports. The module carries a 40 Gbps aggregate data rate across four parallel 10 Gbps optical transmit and receive lanes. Its optical interface uses single-mode fiber over a standard two-strand cable pair as the external transmission medium. The front optical interface presents an LC duplex connector with separate transmit and receive fiber positions. Transmit and receive wavelengths operate across four WDM lanes at 1271 nm, 1291 nm, 1311 nm, and 1331 nm. Maximum link distance reaches 10 km across the specified LR4 optical path under Cisco module specifications. Operating temperature uses the Commercial hardware temperature class for supported Cisco module environments. Digital Optical Monitoring support reports module temperature, transmit optical power, and receive optical power during operation.

With DFB transmitter technology, the optical engine drives four LAN-WDM lanes through integrated transmit-side multiplexing inside the module. The receiver uses PIN photodiode detection for each demultiplexed optical lane in the receive-side optical path. TX power range delivers -7 dBm to 2.3 dBm per lane as average optical output at the interface. RX sensitivity reaches -13.7 dBm per lane at the minimum average receive-power point for the LR4 optical lane. RX overload point tolerates 2.3 dBm per lane at the maximum average receive-power limit for each optical lane. With 64b/66b encoding, the 40GBASE-R signal maps onto four electrical lanes before optical lane transmission. IEEE 802.3ba, SFF-8436, GR-20-CORE, GR-326-CORE, GR-1435-CORE, and RoHS 6 apply to QSFP-40G-LR4 module compliance requirements. With 3.3V supply voltage, the module follows the QSFP+ host power convention for its pluggable electrical interface. At 3.5 W, maximum power consumption matches the LR4 module power rating for populated 40G QSFP port deployments.

Cisco Catalyst 9500, Cisco Nexus 9000, and Cisco ASR 9000 platform families support this Cisco LR4 optic in QSFP slots. Data center aggregation, enterprise campus core, and service provider edge deployments use this module for QSFP port uplinks and interconnects. High-density rack aggregation, campus distribution rooms, and provider transport shelves fit this module's operational placement across IT infrastructure estates. OS2 cabling provides the required cable grade for LR4 links in structured infrastructure. Procurement teams can align OS2 cable inventories with spare transceiver planning before ordering and purchase approval. Buy QSFP-40G-LR4 from ORM Systems in new and certified refurbished condition. Certified refurbished stock passes physical inspection and full-throughput link testing before shipment. Shop QSFP-40G-LR4 online from ORM Systems to check price and secure current stock. Request a quote for planned refreshes, spare pools, and multi-site hardware rollouts. ORM Systems provides bulk quotation for enterprise and volume buyers with account-level sourcing support.

QSFP-40G-LR4 price is $179.44, a 99% saving from the Cisco list price of $17,943.99. QSFP-40G-LR4 is in stock and available for next-day dispatch. (terms applied)

Request bulk order quote for QSFP-40G-LR4 for additional pricing. Browse the full 40G Base Modules series or explore all Cisco products.

QSFP-40G-LR4 Specifications

Product Type
Optical Transceiver
Brand
Cisco
Series
Cisco 40GBASE QSFP Modules
Compatible OEM Part
N/A
Use Case
Data Center / Enterprise Campus / Service Provider
Form Factor
QSFP+
Data Rate
40 Gbps
Protocol
Ethernet / OTN
Fiber Type
Single-Mode (SMF)
Connector Type
LC Duplex
Wavelength TX
1271 nm / 1291 nm / 1311 nm / 1331 nm
Wavelength RX
1271 nm / 1291 nm / 1311 nm / 1331 nm
Reach
10 km (OS2)
Cable Standard
OS2
Transmitter Type
DFB
Receiver Type
PIN
TX Power Min
-7 dBm
TX Power Max
2.3 dBm
RX Sensitivity
-13.7 dBm
RX Power Max
2.3 dBm
Encoding
64b/66b
Supported Standards
IEEE 802.3ba / SFF-8436 / GR-20-CORE / GR-326-CORE / GR-1435-CORE / RoHS 6
DDM/DOM Support
Yes
Power Consumption
3.5 W
Supply Voltage
3.3V
Operating Temperature
Commercial (0°C to 70°C)
Compatible Platforms
Cisco Catalyst 9500 / Cisco Nexus 9000 / Cisco ASR 9000
Certifications
RoHS
Height
13.5 mm
Width
18.4 mm
Depth
72.4 mm
Weight
0.1 kg

QSFP-40G-LR4 Use Case

Aggregation to Core 40 Gigabit Interconnect

The QSFP-40G-LR4 operates as a 40 Gigabit Ethernet interconnect between aggregation and core switches across standard G.652 single-mode fiber. The QSFP+ module carries the 40G signal over four 1310 nm wavelength lanes and multiplexes them onto a duplex LC fiber pair, keeping the physical cabling to two fibers across the span. Engineers configure the ports as routed links or port-channel members depending on the core design. The aggregation layer gains a 10 km 40G path without consuming parallel-fiber trunk capacity.

Data Center Inter-Row Spine Link

QSFP-40G-LR4 fits spine or high-density aggregation links that cross meet-me rooms, inter-row pathways, or separate network areas on single-mode fiber. The module presents a 40GBASE-LR4 interface on duplex LC cabling, with four wavelengths inside the optic carrying the aggregate 40 Gigabit signal. Network teams deploy it between QSFP+ ports where structured SMF already feeds patch panels and where MPO trunks are not part of the route. The fabric gains a long-reach 40G connection that fits two-fiber single-mode distribution across separated switching rows.

Transport-Facing Core Handoff

At the core edge, the QSFP-40G-LR4 connects a 40G switch port to a transport or aggregation platform that expects 40GBASE-LR4 over single-mode fiber. The optic uses four WDM lanes around 1310 nm and supports OTU3 data-rate operation on compatible Cisco platforms, aligning Ethernet-facing core equipment with transport-facing interfaces. Engineers run the handoff over duplex LC patching inside the 10 km optical budget and keep routing policy on the attached core port. The network gains a clear demarcation between packet core and optical transport handoff.

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

QSFP 40GBASE-LR4 OTN Transceiver, LC, 10KMQSFP-40G-LR44 X SFP10G TO QSFP REVERSE ADAPTERCVR-4SFP10G-QSFP
Product TypeOptical TransceiverTransceiver
Form FactorQSFP+QSFP+
Data Rate40 Gbps10G
Connector TypeLC DuplexLC
Wavelength850 nm
Transmission DistanceShort-Range
Fiber TypeSingle-Mode (SMF)Multi-mode
Max Distance300 meters
Supported ProtocolsEthernet
Network InterfaceFiber
Power Consumption3.5 W3.5 W
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 NameCVR-4SFP10G-QSFP=
Height13.5 mm0.7 inches
Width18.4 mm2.2 inches
Depth72.4 mm3.7 inches
Weight0.1 kg0.3 lbs

Reviews & Ratings

S
Steven Hart
5

Excellent long-distance 40G performance over single-mode fiber.

K
Kevin Martin
4

Stable optics for campus and inter-building links.

B
Brian Collins
4

Consistent signal strength with low error rates.

J
Jason White
5

Reliable module for extended reach deployments.

M
Mark Allen
5

Cisco-quality optics that perform as specified.

Questions & Answers

What is the Cisco QSFP-40G-LR4?

The Cisco QSFP-40G-LR4 is a 40 Gigabit QSFP+ transceiver for long-reach connections over single-mode fibre up to 10 kilometres. It uses 4-channel LAN-WDM technology to carry four simultaneous 10G channels over a standard duplex LC fibre pair, achieving 40G aggregate throughput. The QSFP-40G-LR4 also supports OTN framing, making it compatible with carrier-grade optical transport infrastructure in addition to standard 40GbE Ethernet deployments.

What does QSFP mean and what does the LR4 designation indicate?

QSFP stands for Quad Small Form-factor Pluggable, indicating a module carrying four data lanes in a single connector body. 40G is the aggregate data rate. LR stands for Long Reach (10km over single-mode fibre), and 4 indicates the four WDM wavelength channels used to achieve 40G throughput. Each of the four channels carries 10 Gbps at a distinct wavelength, and all four are multiplexed over two OS2 single-mode fibres via a duplex LC connector.

What standard does the QSFP-40G-LR4 conform to?

The QSFP-40G-LR4 conforms to IEEE 802.3ba 40GBASE-LR4, which defines 40GbE transmission over single-mode fibre using 4-channel LAN-WDM to a maximum of 10 kilometres. For OTN operation, it supports OTU3 framing per ITU-T G.709. The module also complies with the QSFP Multi-Source Agreement (MSA), which defines the mechanical and electrical interface. These standards ensure the module is interoperable with compliant infrastructure across both Ethernet and optical transport environments.

How does the 4-channel WDM technology in the QSFP-40G-LR4 work?

The QSFP-40G-LR4 uses LAN-WDM, multiplexing four 10G data streams onto four distinct wavelengths: approximately 1271nm, 1291nm, 1311nm, and 1331nm, each spaced 20nm apart. All four channels travel simultaneously over a single OS2 single-mode fibre in each direction, with a WDM mux/demux circuit inside the module combining and separating the channels. This achieves 40G aggregate throughput on a standard two-fibre LC duplex path without any changes to the installed fibre infrastructure.

What data rate does the QSFP-40G-LR4 support?

The QSFP-40G-LR4 delivers 40 Gigabit Ethernet throughput by aggregating four 10.3125 Gbps LAN-WDM channels. The host Cisco platform sees this as a single 40G interface; the four-channel multiplexing is handled entirely inside the module. This is the IEEE 802.3ba 40GBASE-LR4 specification. The 40G aggregate rate is available over the full 10km reach on OS2 single-mode fibre with no throughput reduction at distance within the module's rated reach.

What is the maximum reach of the QSFP-40G-LR4?

The QSFP-40G-LR4 reaches up to 10 kilometres over OS2 single-mode fibre, consistent with the IEEE 802.3ba 40GBASE-LR4 specification. This makes it suitable for campus backbone links, data centre interconnect between nearby facilities, and aggregation layer uplinks where 40G over existing single-mode infrastructure is required. For distances beyond 10km, the QSFP-40G-ER4 extends reach to 40 kilometres using the same LAN-WDM technology and LC connector.

What connector type does the QSFP-40G-LR4 use?

The QSFP-40G-LR4 uses a duplex LC connector, the same connector found on 10G SFP+ and 1G SFP long-reach modules. This is a key deployment advantage over short-reach 40G SR4 modules, which require MPO cabling. Because the QSFP-40G-LR4 uses LC connectors, it connects directly to existing OS2 single-mode fibre runs already terminated with LC connectors, with no need to install new MPO cabling or reconfigure existing patch panels.

What fibre type does the QSFP-40G-LR4 require?

The QSFP-40G-LR4 requires OS2 single-mode fibre. The LAN-WDM wavelengths (1271nm to 1331nm) are designed for single-mode transmission, and multimode fibre is not compatible with this module. A standard two-fibre OS2 duplex LC patch cable is all that is needed to connect the QSFP-40G-LR4, making deployment straightforward on any existing single-mode LC-terminated infrastructure without additional accessories or cabling changes.

Does the QSFP-40G-LR4 support Digital Optical Monitoring?

Yes, the QSFP-40G-LR4 supports DOM. On platforms that report per-channel data, individual transmit power levels for each of the four WDM lanes are visible alongside aggregate receive power, laser temperature, and supply voltage. Per-channel monitoring is particularly useful for diagnosing degraded WDM links, where a fault on a single wavelength may reduce aggregate throughput before causing a complete link failure. DOM data is accessible via standard Cisco show commands on supported platforms.

What is OTN support and why does it matter for the QSFP-40G-LR4?

OTN (Optical Transport Network) support means the QSFP-40G-LR4 can carry OTU3-framed traffic as defined in ITU-T G.709, in addition to standard Ethernet frames. OTN adds overhead for performance monitoring, fault management, and protection switching used in carrier-grade transport networks. This makes the QSFP-40G-LR4 suitable for service providers and enterprises deploying 40G Ethernet services over an OTN transport infrastructure, where pure Ethernet modules would not support the required framing.

What is the QSFP-40G-LR4 used for?

The QSFP-40G-LR4 is used to establish 40 Gigabit Ethernet connections over single-mode fibre up to 10 kilometres. Common deployments include campus backbone links between buildings, data centre interconnect between adjacent facilities, 40G aggregation layer uplinks in enterprise networks, and carrier transport environments requiring OTN framing. It is appropriate wherever 40G throughput is needed over a standard LC-connected two-fibre single-mode path without new cabling infrastructure.

Is the QSFP-40G-LR4 suitable for data centre interconnect?

Yes, the QSFP-40G-LR4 is widely used for data centre interconnect at 40G over single-mode fibre. Connecting two geographically adjacent data centre facilities within 10km is a primary use case. The duplex LC connector means no MPO recabling is needed, and the 10km reach covers most intra-campus and short metro DCI scenarios without optical amplification. OTN framing support also allows the QSFP-40G-LR4 to operate over carrier-managed fibre paths that use OTN transport.

Can the QSFP-40G-LR4 be deployed on existing LC-terminated single-mode fibre?

Yes, and this is one of the module's key advantages. Because it uses a standard duplex LC connector, the QSFP-40G-LR4 installs directly onto existing OS2 single-mode infrastructure already terminated with LC connectors, reusing the installed fibre plant without any modification. This makes upgrading an existing 10G LC-connected single-mode link to 40G practical by replacing the host interface cards and transceivers while leaving the fibre unchanged.

Is the QSFP-40G-LR4 suitable for carrier and service provider networks?

Yes, the OTN framing support makes the QSFP-40G-LR4 specifically suited to carrier environments. OTU3 framing adds performance monitoring, protection switching, and network management overhead required in carrier optical transport networks. Service providers deploying 40G Ethernet services over OTN infrastructure can use the QSFP-40G-LR4 on compatible Cisco ASR and CRS platforms to interface between the Ethernet and OTN transport layers without additional protocol conversion equipment.

What Cisco platforms support the QSFP-40G-LR4?

The QSFP-40G-LR4 is supported on Cisco Nexus 5000, 6000, 7000, and 9000 series, ASR 1000 and 9000 series routers, Catalyst 4500E and 6500E with appropriate line cards, and Catalyst 9400, 9500, and 9600 series with 40G-capable line cards. Platform and line card compatibility varies significantly at the QSFP+ tier. Always verify against Cisco's transceiver compatibility matrix for your specific chassis, supervisor, and line card before ordering.

Is the QSFP-40G-LR4 compatible with existing LC-terminated single-mode patch panels?

Yes, the QSFP-40G-LR4 connects directly to any OS2 single-mode patch panel or fibre distribution frame terminated with LC connectors. No adapter panels, MPO breakout assemblies, or new cabling are required. This makes it the most deployment-friendly 40G long-reach option for sites where single-mode LC infrastructure is already installed, as the only changes needed are the host platform interface cards and the QSFP-40G-LR4 modules themselves.

Can the QSFP-40G-LR4 connect to 40GBASE-LR4 modules from other vendors at the far end?

Yes, at the optical link layer. The QSFP-40G-LR4 uses IEEE 802.3ba 40GBASE-LR4 LAN-WDM wavelengths, which are standard. A QSFP-40G-LR4 at one end can establish a link with a 40GBASE-LR4 compliant module from another vendor at the far end, as both conform to the same wavelength and power specifications. The Cisco module itself must be in a Cisco platform, but the far end can use any compliant 40GBASE-LR4 module in its own compatible platform.

Can the QSFP-40G-LR4 be used in non-Cisco equipment?

The QSFP-40G-LR4 is Cisco-encoded and requires a Cisco host platform to operate. It cannot be used in switches or routers from other vendors. At the optical link layer, the 40GBASE-LR4 standard is interoperable and allows a Cisco QSFP-40G-LR4 to link with a compatible module at the far end regardless of that end's vendor. The encoding restriction applies to the host device of the Cisco module, not to the optical standard used across the fibre.

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

The QSFP-40G-LR4 uses LAN-WDM over a duplex LC connector on OS2 single-mode fibre up to 10km. The QSFP-40G-SR4-S uses parallel 850nm optics with an MPO connector over OM3/OM4 multimode fibre up to 150m. They are both 40G modules but are designed for entirely different fibre types, link distances, and connector types. The LR4 is for long-reach single-mode campus and DCI links; the SR4-S is for short-reach high-density data centre connections.

How does the QSFP-40G-LR4 compare to the QSFP-40G-ER4?

The QSFP-40G-ER4 extends reach to 40 kilometres over single-mode fibre using the same LAN-WDM technology and duplex LC connector. Both are 40G single-mode modules. For connections within 10km, the QSFP-40G-LR4 is the correct and more cost-effective choice. The QSFP-40G-ER4 is used when link distances genuinely exceed 10km, such as longer metropolitan fibre runs or connections between distant enterprise facilities over leased single-mode infrastructure.

Should I use a QSFP-40G-LR4 or four SFP-10G-LR-S modules for a 40G link?

A single QSFP-40G-LR4 uses one duplex LC fibre pair and one QSFP+ port for 40G. Four SFP-10G-LR-S modules would require four separate 10G SFP+ ports and four separate LC fibre pairs, consuming significantly more port count and fibre strands. The QSFP-40G-LR4 is more efficient in port density, power consumption, and fibre usage per Gbps. Use multiple 10G modules only when the platform lacks QSFP+ slots or when separate logical 10G paths are operationally required.

Is the QSFP-40G-LR4 a bridge toward 100G or is it a terminal investment?

The QSFP-40G-LR4 is practical for current 40G requirements. The industry has largely moved toward 100G for new high-capacity deployments, but 40G infrastructure remains widely operational across enterprise and carrier networks. When planning future upgrades, note that 100G QSFP28 LR4 modules also use duplex LC connectors and OS2 single-mode fibre, meaning the existing fibre infrastructure investment is preserved when you eventually migrate from 40G to 100G on the same fibre plant.

Is the QSFP-40G-LR4 available new and refurbished?

Yes, the QSFP-40G-LR4 is available in both new and certified refurbished condition from ORM Systems. Refurbished units are tested before dispatch, with all four WDM channel outputs and the receive path verified for optical power within Cisco's specification. Refurbished QSFP modules are a cost-effective option for data centre and enterprise deployments where genuine Cisco 40G hardware is required without the full new unit price.

What is the price of the QSFP-40G-LR4?

QSFP-40G-LR4 modules carry a higher unit price than 10G SFP+ equivalents, reflecting the more complex internal LAN-WDM optics. ORM Systems offers competitive pricing on both new and refurbished stock, with volume discounts available for bulk orders. For the current price, check the QSFP-40G-LR4 product page on ormsystems.com or contact the sales team for a quote, particularly for multi-unit orders tied to a campus backbone or data centre interconnect project.

Is the QSFP-40G-LR4 still available or has it been superseded?

The QSFP-40G-LR4 remains actively stocked at ORM Systems. While the industry is transitioning toward 100G for new builds, 40G infrastructure continues to operate extensively across enterprise and carrier networks and replacement modules remain in consistent demand. ORM Systems carries both new and refurbished stock to support ongoing maintenance of 40G deployments and new installations where 40G is the current capacity requirement.

Can I order the QSFP-40G-LR4 in bulk from ORM Systems?

Yes, ORM Systems accepts bulk orders for the QSFP-40G-LR4 with volume pricing for larger quantities. Data centre builds, campus backbone upgrades, and carrier infrastructure projects may require multiple 40G LR4 modules. Contact the ORM Systems sales team or use the bulk quotation form on the product page with your required quantity, delivery location, and timeline for a tailored pricing response.

What are the lead times for the QSFP-40G-LR4 from ORM Systems?

Lead times depend on current stock availability and delivery region. ORM Systems ships from UK, USA, UAE, and Netherlands locations. QSFP-40G-LR4 availability may differ from higher-volume 10G SFP+ modules, so confirming stock before placing a project-critical order is recommended. Contact the ORM Systems sales team to verify current availability and lead time for your required quantity.

What warranty does the QSFP-40G-LR4 come with from ORM Systems?

New Cisco QSFP-40G-LR4 units carry the standard Cisco hardware warranty. Refurbished units are covered by the ORM Systems warranty against hardware defects identified after delivery. For specific warranty terms applicable to your order condition, check the QSFP-40G-LR4 product listing on ormsystems.com or contact ORM Systems before purchasing.

Is a refurbished QSFP-40G-LR4 tested before dispatch?

Yes, refurbished QSFP-40G-LR4 units at ORM Systems are tested before dispatch. All four LAN-WDM channel outputs and the receive path are verified for optical power within Cisco's specification, DOM data is confirmed accessible, and the module is physically undamaged. The four-channel WDM architecture means each individual channel is checked rather than just the aggregate, ensuring the full optical performance of the module before release.

What certifications does the QSFP-40G-LR4 carry?

The Cisco QSFP-40G-LR4 meets FCC Class A and CE electromagnetic compatibility standards and is RoHS compliant. It conforms to IEEE 802.3ba 40GBASE-LR4, ITU-T G.709 OTN framing, and the QSFP Multi-Source Agreement. These certifications confirm suitability for enterprise, carrier, and regulated public sector deployments in the UK, EU, and US.

How do I install the QSFP-40G-LR4 in a Cisco switch or router?

Insert the QSFP-40G-LR4 into a compatible QSFP+ slot with the locking tab aligned correctly until the module seats firmly. Remove the dust cap and connect an OS2 single-mode duplex LC patch cable. The Cisco device detects the module automatically. Confirm detection with "show interfaces" or "show inventory." Verify the four WDM channels are within specification via "show interfaces transceiver detail" on platforms that report per-channel DOM data.

Does enabling OTN mode on the QSFP-40G-LR4 require special configuration?

Yes. OTN framing requires platform-level configuration on the host Cisco device. On platforms such as the ASR 9000 that support OTN mode, the interface must be configured for OTN encapsulation and OTU3 framing enabled through IOS XR commands. Standard 40GbE Ethernet operation requires no special configuration beyond normal interface setup. Consult the platform-specific configuration guide for OTN mode commands, as the syntax varies between IOS XR, IOS XE, and NX-OS.

Does the QSFP-40G-LR4 require a licence to operate as a standard 40GbE interface?

No transceiver-specific licence is required for standard 40GbE operation. On platforms where OTN functionality requires a platform software licence, such as certain ASR 9000 configurations, the licence applies to the platform's OTN software features, not to the physical module. Standard 40GbE use on any compatible Cisco platform does not require any licence activation related to the QSFP-40G-LR4 itself.

Where can I buy the QSFP-40G-LR4 in the UK?

The QSFP-40G-LR4 is available from ORM Systems at ormsystems.com. ORM Systems is a UK-based B2B hardware reseller with UK fulfilment, providing genuine Cisco 40G LR4 modules for enterprise and carrier deployments. Both new and refurbished units are available with competitive pricing, and the sales team handles bulk orders for larger infrastructure projects.

Does ORM Systems ship the QSFP-40G-LR4 internationally?

Yes, ORM Systems ships the QSFP-40G-LR4 internationally from fulfilment locations in the UK, USA, UAE, and Netherlands. Contact the ORM Systems sales team for region-specific delivery timelines and any import documentation requirements before placing an international order.