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QSFP-40G-LR4-S
Cisco 40GBASE-LR4 QSFP Transceiver Module, 40G, 10km, SMF, L...
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QSFP-40G-LR4-S is a Cisco QSFP+ optical transceiver module for 40 Gigabit Ethernet links. The module uses single-mode fiber as its optical medium. Its host-side form factor fits Cisco QSFP+ 40G ports. The optical interface uses duplex LC connectivity. The wavelength set operates in the 1310 nm range. The maximum supported link distance is 10 km. Commercial operating temperature applies to this S-Class module. The module carries 40GBASE-LR4 Ethernet traffic only. The S-Class variant does not support FCoE.
QSFP-40G-LR4-S carries the 40 Gigabit Ethernet signal over four optical wavelengths. Multiplexing and demultiplexing occur inside the transceiver module. With IEEE 802.3ba, the module aligns to 40GBASE-LR4 optical Ethernet operation. At SFF-8436, the electrical and management interface follows the QSFP+ MSA requirement. GR-20-CORE applies to optical fiber cable requirements. GR-326-CORE applies to single-mode connector and jumper assembly requirements. GR-1435-CORE applies to multifiber optical connector requirements across the Cisco QSFP portfolio. RoHS 6 compliance applies to the listed Cisco 40GBASE QSFP modules. Power consumption is rated at 3.5 W. The blue pull tab identifies the LR4 optical module family. Cisco lists the module as a hot-swappable input/output device for supported QSFP ports.
Cisco Nexus 3000, Nexus 3100, Nexus 3200, Nexus 3500, Nexus 9300, and Cisco UCS 6300 families appear in compatibility references for this optic. Deployment roles include data centre interconnect, campus backbone, aggregation, and enterprise core links. OS2 cable grade supports the 10 km optical design for installed single-mode runs. Buy QSFP-40G-LR4-S from ORM Systems in new and certified refurbished condition. Certified refurbished stock is tested before dispatch for product identity and operational readiness. Order QSFP-40G-LR4-S when the bill of materials requires Cisco S-Class Ethernet-only LR4 optics. Request a quote from ORM Systems to check price, condition, warranty, and lead time. ORM Systems provides bulk quotation support for enterprise and volume buyers.
QSFP-40G-LR4-S price is $713.00, a 94.5% saving from the Cisco list price of $12,860.00. QSFP-40G-LR4-S is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-40G-LR4-S for additional pricing. Browse the full Cisco 40G Optical Modules series or explore all Cisco products.
QSFP-40G-LR4-S sits in a 40G QSFP uplink port and carries leaf-to-spine traffic across duplex LC single-mode fiber. Engineers use the 40GBASE-LR4 optical path when racks, rows, or rooms need 10 km optical reach without parallel MPO cabling. The Cisco S-Class optic terminates the physical link while the switch handles VLAN trunks, routed links, ECMP, and telemetry. This resolves long-reach uplink placement without changing the logical fabric design.
QSFP-40G-LR4-S occupies a core or distribution QSFP port and provides the 40G optical handoff between supported Cisco devices over single-mode campus fiber. The duplex LC interface matches common SMF patching between equipment rooms, while the 10 km LR4 reach covers longer riser or building paths. Engineers configure the host ports as routed links, trunks, or port-channel members according to the campus design. The network gains a higher-capacity backbone link without replacing the installed single-mode fiber plant or moving the path onto MPO cassettes.
The transceiver operates at the aggregation edge where a supported Cisco switch presents 40G Ethernet toward another building, remote equipment room, or adjacent data center zone. QSFP-40G-LR4-S uses 1310nm 40GBASE-LR4 signaling over duplex LC single-mode fiber, which keeps the link aligned with 10 km SMF design assumptions. Engineers validate fiber loss, clean LC connectors, and monitor optical levels from the host platform during turn-up. The result is a documented interbuilding 40G path with controlled distance, connector, and support-matrix risk.
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| QSFP-40G-LR4-S |  QSFP-40G-CSR-S |  CVR-CFP-4SFP10G |  CFP-40G-FR |  QSFP-40G-SR-BD | |
|---|---|---|---|---|---|
| Product Type | Optical Transceiver | Transceiver | Transceiver | Transceiver | Optical Transceiver |
| Form Factor | QSFP+ | QSFP | CFP | CFP | QSFP+ |
| Data Rate | 40 Gbps | 40G | 10G | 40G | 40 Gbps |
| Connector Type | LC Duplex | LC | LC | LC | LC Duplex |
| Operating Temperature | Commercial (0°C to 70°C) | 0 to 70°C | 0 to 70°C | 0 to 70°C | Commercial (+10°C to 70°C) |
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QSFP-40G-LR4-S delivered stable 40G connectivity over 10km. Clean optical levels and seamless integration into our enterprise core.
Reliable 40GBASE-LR4 performance with consistent throughput across single-mode fiber.
Strong signal integrity and predictable latency in production workloads.
Integrated easily into our aggregation switches. Solid 40GbE long-range solution.
Excellent 10km reach with dependable performance under peak traffic.
Enterprise-class optics maintaining stable 40G bandwidth.
Clean installation and reliable long-distance 40G connectivity.
Cisco QSFP-40G-LR4-S is a 40GBASE-LR4 S-Class QSFP optical transceiver for 40 Gigabit Ethernet links over single-mode fiber. It uses a duplex LC connector and supports 10 km reach at the 1310nm wavelength band. Network teams use it for long-reach 40G uplinks, aggregation links, and data center or campus fiber connections on supported Cisco platforms.
QSFP-40G-LR4-S identifies a Cisco QSFP form factor module for 40G Ethernet, with LR4 indicating long-reach 40GBASE-LR4 optics and -S indicating the Cisco S-Class version. The SKU points buyers to a 40G optical module for single-mode fiber, duplex LC connectivity, 1310nm operation, and 10 km link distance where the host platform supports this exact part.
QSFP-40G-LR4-S is an optical transceiver module, not a switch, router, cable, or license. It plugs into a compatible QSFP+ 40G port and converts the electrical interface of the host device into an optical 40GBASE-LR4 signal. The module is selected when the network design requires 40G over single-mode fiber with duplex LC connectivity.
The QSFP-40G-LR4-S sits in Cisco's 40G QSFP transceiver family as an S-Class long-reach single-mode option. It serves the 10 km LR4 role, while shorter-reach 40G QSFP modules serve multimode fiber links and extended-reach optics serve longer spans. Buyers usually select it when 40G bandwidth and existing SMF plant matter more than moving to 100G optics.
The form factor is QSFP for 40G switch and router interfaces that accept Cisco QSFP optics. QSFP-40G-LR4-S occupies one QSFP+ port and presents a duplex LC optical interface on the cable side. It is not an SFP, SFP+, QSFP28, or copper DAC module, so port type must match before ordering.
The supported data rate is 40 Gigabit Ethernet using the 40GBASE-LR4 standard. QSFP-40G-LR4-S is intended for 40G optical ports, not 10G SFP+ ports or 100G QSFP28 ports. Buyers should match the optic to the line-card speed, port mode, and Cisco software support list for the target device.
The module operates in the 1310nm wavelength region used by 40GBASE-LR4 optics. LR4 transceivers transmit 40G over multiple optical lanes and carry the traffic across duplex single-mode fiber rather than parallel multimode fiber. This wavelength and optical design make QSFP-40G-LR4-S suitable for longer fiber runs than 40G SR optics.
QSFP-40G-LR4-S supports up to 10 km reach over single-mode fiber when the link budget, fiber quality, connectors, and host platform support the deployment. It is designed for SMF infrastructure rather than OM3 or OM4 multimode cabling. The 10 km distance makes it useful for campus backbone, data center interconnect, and aggregation links.
The connector type is duplex LC, which uses two LC fibers for transmit and receive paths. QSFP-40G-LR4-S is different from 40G SR4 and CSR4 optics that commonly use MPO or MTP parallel-fiber cabling. Buyers should confirm that the patch panels, jumpers, and fiber plant are duplex LC single-mode before installation.
QSFP-40G-LR4-S is used in supported Cisco hardware with QSFP+ 40G optical ports. Compatibility is platform and software dependent, so buyers should verify the Cisco transceiver support matrix for the exact Nexus, Catalyst, ASR, or line-card model. The host device must support Cisco 40GBASE-LR4 S-Class optics and the required port operating mode.
QSFP-40G-LR4-S is used for 40G uplinks across single-mode fiber where the link distance is beyond typical multimode reach. Common roles include switch-to-switch trunks, distribution-to-core links, leaf-to-spine uplinks, and data center or campus aggregation paths. The duplex LC interface fits existing single-mode patching without moving to MPO parallel fiber.
The module fits medium and large environments that still run 40G aggregation or core uplinks. It is especially relevant where network teams have existing single-mode fiber between rooms, buildings, or racks and need 10 km optical reach. QSFP-40G-LR4-S provides a practical 40G path without redesigning cabling around short-reach multimode optics.
QSFP-40G-LR4-S suits east-west aggregation traffic, storage network uplinks, virtualization clusters, campus backbone links, and WAN-adjacent handoffs where a supported Cisco platform uses 40G QSFP ports. The module does not define the workload itself, but it supplies the optical transport needed when the application path requires sustained 40G bandwidth over SMF.
The SKU works best in a planned fiber deployment where port type, fiber type, distance, and Cisco support status are already confirmed. Network engineers place QSFP-40G-LR4-S in 40G uplink ports, connect duplex LC single-mode patch leads, and validate optical levels. The result is a fixed 40G LR4 path between supported devices.
QSFP-40G-LR4-S should be matched to Cisco platforms that explicitly list the SKU or its S-Class optic family as supported. Examples include selected Cisco Nexus data center switches, Catalyst core or aggregation platforms, and Cisco router line cards with QSFP+ 40G ports. Exact support depends on the hardware PID, transceiver matrix, and software release.
The relevant optical standard is 40GBASE-LR4 for 40 Gigabit Ethernet over single-mode fiber. QSFP-40G-LR4-S aligns with IEEE 802.3ba 40G Ethernet design principles and uses duplex LC fiber presentation. Higher-layer protocols such as VLANs, routing, link aggregation, and QoS are handled by the Cisco switch or router, not by the optical module itself.
QSFP-40G-LR4-S is designed for single-mode fiber, so the link should use appropriate OS2 or equivalent SMF cabling, clean LC connectors, and optical patching rated for the distance. It is not the correct choice for OM3 or OM4 multimode runs. Fiber inspection and cleaning before turn-up help protect link margin on 10 km paths.
Interoperability should be checked against both endpoint vendors' optic policies and the IEEE 40GBASE-LR4 link requirements. QSFP-40G-LR4-S is a Cisco-coded transceiver for Cisco hosts, so mixed-vendor links require confirmation that the opposite endpoint supports compatible 40GBASE-LR4 optics, duplex LC single-mode fiber, wavelength plan, and optical power budget.
QSFP-40G-LR4-S and QSFP-40G-LR4 both address 40GBASE-LR4 10 km single-mode links with duplex LC connectivity, but QSFP-40G-LR4-S is the Cisco S-Class SKU. The standard QSFP-40G-LR4 is chosen when the platform or bill of materials specifies the non-S part. The safest choice is the exact SKU listed in the Cisco support matrix.
QSFP-40G-LR4-S is for 10 km single-mode fiber over duplex LC, while QSFP-40G-SR4-S is for short-reach multimode fiber and uses parallel MPO or MTP cabling. LR4-S fits building, campus, or data center spans over SMF. SR4-S fits short in-row or room-level links where multimode cabling is already installed.
QSFP-40G-LR4-S targets 10 km 40G single-mode links, while Cisco QSFP-40G-ER4 optics target longer extended-reach single-mode distances. LR4-S is the better match when the fiber span is within 10 km and the host platform supports the S-Class LR4 SKU. ER4 is selected only when the optical budget and distance requirement exceed LR4.
QSFP-40G-LR4-S differs from Cisco QSFP-40G-CSR4 because LR4-S uses duplex LC single-mode fiber for 10 km reach, while CSR4 is a 40G multimode optic associated with extended MMF reach and parallel-fiber cabling. The choice is mainly determined by installed fiber type, connector infrastructure, and the required distance between endpoints.
New and refurbished availability for QSFP-40G-LR4-S is commonly relevant because enterprise optics are often purchased for network refreshes, spares, and legacy 40G expansion. ORM Systems lists sourcing options based on market supply and buyer requirements. Refurbished units should be tested before dispatch, while new units suit projects requiring unused hardware.
QSFP-40G-LR4-S price depends on condition, quantity, lead time, and current market availability. Optical transceiver pricing often changes with Cisco supply, refurbished stock, and bulk purchasing volume. Buyers comparing quotes should confirm the exact SKU, S-Class designation, warranty coverage, and whether testing documentation or serial-level inspection is included.
Production and lifecycle status for QSFP-40G-LR4-S should be checked against Cisco's official notices and the required platform support matrix before procurement. Many 40G environments continue to need replacement optics even as newer networks move toward 100G. ORM Systems helps source parts for active refreshes, spares, and supported installed bases.
Lead times for QSFP-40G-LR4-S vary by condition, quantity, and supplier stock position. Single-unit replacement orders often move faster than larger project quantities, while exact-match Cisco optics sometimes require sourcing across multiple channels. ORM Systems provides lead-time guidance during quotation so network teams align optic delivery with maintenance windows.
Bulk discounts are available for QSFP-40G-LR4-S when buyers need multiple optics for core refreshes, distribution uplinks, spare kits, or staged deployments. Quantity pricing is especially useful for standardizing 40G LR4 links across repeated Cisco platforms. Buyers should request one quote with target quantity, condition preference, and required delivery location.
ORM Systems warranty coverage for QSFP-40G-LR4-S depends on the quoted condition and supply option, with eligible optics commonly covered for up to three years. Warranty terms should be confirmed on the quotation before purchase. The coverage helps buyers manage risk when sourcing Cisco 40G optics for production links, spares, or staged network upgrades.
Refurbished QSFP-40G-LR4-S units should be inspected, cleaned, and tested before dispatch to confirm identity and operational condition. Relevant checks include SKU verification, connector condition, optical transmit and receive behavior, and basic link validation where supported. Testing helps reduce failed turn-ups caused by damaged connectors, wrong coding, or poor optical performance.
QSFP-40G-LR4-S is associated with 40GBASE-LR4 optical Ethernet operation and the QSFP module ecosystem used in Cisco networking equipment. Compliance requirements should be checked against Cisco documentation, the host platform data sheet, and local procurement standards. Buyers should also confirm any RoHS, safety, or regulatory documentation required by the purchasing organization.
First-use setup starts by confirming that the Cisco port supports QSFP-40G-LR4-S, then inserting the module into the QSFP+ cage and connecting duplex LC single-mode fiber. Network engineers verify port status, optical readings where available, error counters, and link negotiation. Clean LC ends and correct transmit-to-receive polarity are important during turn-up.
QSFP-40G-LR4-S does not normally require a separate optic license by itself. The host switch or router software image, feature license, and port configuration determine whether the 40G interface operates in the intended network role. Buyers should confirm Cisco software support, port mode, and any platform-level licensing before scheduling installation.
Required accessories include duplex LC single-mode patch leads, suitable SMF trunks or panels, cleaning tools, inspection scope access, and a compatible Cisco 40G QSFP+ host port. Labels and spare dust caps also help operations teams manage optics during installation. For longer spans, engineers should confirm loss budget before relying on existing fiber.
QSFP-40G-LR4-S can be bought in the UK through ORM Systems for businesses sourcing Cisco optics, replacement transceivers, or bulk 40G project stock. ORM Systems supports quote-based procurement rather than consumer checkout language, which suits IT teams that need condition options, warranty confirmation, and exact SKU matching before purchase.
ORM Systems ships QSFP-40G-LR4-S internationally, subject to destination, courier options, stock source, and any applicable export or import requirements. International buyers should provide delivery country, quantity, preferred condition, and required delivery timing when requesting a quote. This helps align Cisco optic sourcing with project schedules, customs handling, and maintenance windows.
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