Featured Deal
Hand-picked by our procurement team for standout value. This unit is offered at our sharpest price on current stock, verified against live market rates.
Name:
Added to cart 28 times recently
2 In stock - Ready to Ship
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
3 Year Extended Warranty
Same-day Shipping
30-Day Money Back Guarantee
Shipping:
Payment:
3 Year Extended Warranty
Same-day Shipping
30-Day Money Back Guarantee
Need Additional Discount on Product?
Request a quote below - Get Exclusive Pricing and Support.
Shipping:
Payment:
QSFP-100G-LR4-S
Cisco 100GBASE-LR4 QSFP28 Transceiver Module, 10km, SMF, Dup...
Federal agencies and Fortune 500 operations source through ORM Systems.
US Government & Defense
Enterprise Clients
Regional teams and 25+ distribution partners keep stock near you and accountability in your time zone.
Pay by PayPal or Revolut with full chargeback rights. Order on PO terms, Net-30 for government.
Every registration we claim is public record — check our federal contractor status yourself before you spend a dollar.
Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
QSFP-100G-LR4-S is a Cisco QSFP28 optical transceiver module for 100 Gigabit Ethernet operation. The module uses single-mode fiber as its physical media type. Its optical interface uses duplex LC connectors for two-fiber transmission. The transmit and receive wavelengths are 1295 nm, 1300 nm, 1304 nm, and 1309 nm. The module supports a maximum link distance of 10 km. Commercial temperature operation applies to this standard-temperature LR4 model. DOM support is present for digital optical monitoring. The module carries the 100GBASE-LR4 signal over four optical lanes. The LR4 optical path operates across a standard G.652 single-mode fiber pair.
Transmit power range delivers -4.3 dBm to +4.5 dBm per lane. RX sensitivity reaches -10.6 dBm per lane for the optical receiver path. RX overload point is +4.5 dBm per lane. With IEEE 100GBASE-LR4, the optical specification does not employ FEC. At 4.0 W, the module stays within Cisco’s QSFP 100G power profile for this product row. IEEE 802.3ba provides the 100GBASE-LR4 standards basis. IEEE 802.3bm applies to the Cisco 100G QSFP module compliance set. SFF-8665 governs the QSFP28 four-lane pluggable transceiver solution. SFF-8636 governs the common management interface. QSFP-100G-LR4-S also aligns with GR-20-CORE, GR-326-CORE, GR-468-CORE, and RoHS 6.
Cisco Nexus 9000, Catalyst 9500, ASR 9000, NCS 4000, NCS 4200, and NCS 5500 families use this optic where platform support lists the SKU. Data centre interconnect, campus backbone, metro aggregation, core handoff, and routed edge deployments use the 100G LR4 link role. OS2 cabling provides the required grade for long-distance structured fiber routes. Buy QSFP-100G-LR4-S from ORM Systems in new and certified refurbished condition. Certified refurbished stock is tested before dispatch for optical performance and operational readiness. Request a quote from ORM Systems to check price, availability, and lead time. Order QSFP-100G-LR4-S for replacement optics, planned upgrades, or spare inventory. ORM Systems provides bulk quotation for enterprise and volume buyers.
QSFP-100G-LR4-S price is $620.00, a 98.2% saving from the Cisco list price of $35,389.00. QSFP-100G-LR4-S is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-100G-LR4-S for additional pricing. Browse the full Cisco 100G Optical Modules series or explore all Cisco products.
QSFP-100G-LR4-S terminates a 100GBASE-LR4 uplink between aggregation and core platforms over a duplex G.652 single-mode fiber pair. The module occupies a supported Cisco QSFP28 port and presents a 10 km optical path through LC connectors. Engineers map the interface as a routed link, port channel member, or high-capacity trunk according to the core design. The LR4 standard keeps the long-reach handoff on two fibers without MPO parallel cabling. The network gains a defined 100G backbone path between upper-tier switching domains.
The transceiver sits at the data center interconnect edge and carries 100G Ethernet traffic across single-mode fiber between facilities within the 10 km LR4 reach envelope. QSFP-100G-LR4-S uses four optical wavelengths inside the module, so the external plant remains a duplex LC fiber pair. Engineers validate loss, patch panels, and receive power before moving production VLANs or routed adjacencies onto the link. The deployment creates a high-capacity inter-site path without changing the fiber route to parallel optics.
Network operations teams place QSFP-100G-LR4-S in the approved optics pool for Cisco platforms that already run 100GBASE-LR4 links. The module matches 10 km single-mode duplex LC deployments and follows the IEEE LR4 specification without host FEC dependency. Engineers label spares by reach, connector, standard, and supported platform so replacement work does not mix LR4 with LR1, CWDM4, PSM4, or ER4 optics. The result is faster optical replacement with fewer compatibility mistakes during outage response.
Mon–Fri: [09:00-16:00]
Avg. response under 30 mins
| QSFP-100G-LR4-S |  CFP-100G-SR10 |  CPAK-100G-LR4 |  CPAK-100GE-LR4 |  QSFP-100G-PSM4-S | |
|---|---|---|---|---|---|
| Product Type | Optical Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP28 | CFP | QSFP28 | QSFP28 | QSFP |
| Data Rate | 100 Gbps | 100G | 100G | 100G | 100G |
| Connector Type | LC Duplex | LC | LC | LC | LC |
| Fiber Type | Single-Mode (SMF) | Multi-mode | Single-mode | Single-mode | Single-mode |
| Operating Temperature | Commercial (0°C to 70°C) | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reliable 100G LR4 transceiver achieving stable 10km SMF connectivity. Perfect for core network upgrades.
Delivered full 100G throughput with consistent optical levels.
Smooth installation and dependable long-haul performance.
Maintained clean signal integrity during peak traffic loads.
Excellent interoperability with our 100G switching environment.
Stable backbone connectivity and predictable latency.
High performance 100G solution for enterprise infrastructure.
Cisco QSFP-100G-LR4-S is a 100GBASE-LR4 optical transceiver for 100 Gigabit Ethernet links over single-mode fiber. It uses the QSFP28 form factor, supports up to 10 km reach over G.652 SMF, and uses duplex LC connectors. It is built for Cisco platforms that support QSFP28 100G optical interfaces.
QSFP-100G-LR4-S identifies a Cisco QSFP 100G transceiver for LR4 single-mode optical links. QSFP refers to the pluggable module family, 100G identifies the Ethernet speed class, LR4 refers to 100GBASE-LR4 long-reach four-wavelength optics, and the S suffix identifies the Cisco S-Class version of the module.
QSFP-100G-LR4-S is an optical transceiver, not a switch, router, cable, or adapter card. It installs into a compatible QSFP28 or QSFP100 port and converts the electrical 100G Ethernet signal from the host platform into optical transmission over single-mode fiber using duplex LC patch leads.
QSFP-100G-LR4-S sits in Cisco's 100G QSFP optical module family as a long-reach single-mode option. It is positioned for 10 km duplex fiber links, above short-reach multimode options such as QSFP-100G-SR4-S and below longer-reach variants such as QSFP-100G-ER4L-S or QSFP-100G-ZR4-S.
QSFP-100G-LR4-S uses the QSFP28 optical transceiver form factor for 100G Ethernet ports. The compact hot-pluggable module format is designed for high-density 100G interfaces on compatible Cisco switches, routers, and line cards. Buyers should confirm that the target platform supports Cisco QSFP28 100G optics before ordering.
QSFP-100G-LR4-S supports 100GBASE Ethernet rate operation for 100 Gigabit Ethernet links. It is intended for 100G optical ports rather than 40G QSFP+ interfaces or 25G SFP28 ports. The host port, software release, and Cisco compatibility matrix should all support this 100G QSFP optical module.
QSFP-100G-LR4-S follows the 100GBASE-LR4 optical standard, which uses four optical wavelengths over single-mode fiber. Multiplexing and demultiplexing are handled inside the transceiver, allowing the 100G Ethernet signal to run over a standard duplex single-mode fiber pair rather than a parallel MPO fiber connection.
QSFP-100G-LR4-S supports link lengths up to 10 km over a standard pair of G.652 single-mode fiber. It is not intended for OM3, OM4, or OM5 multimode fiber links. Network teams use it where 100G connectivity must cross longer campus, metro, or facility distances over existing SMF cabling.
QSFP-100G-LR4-S uses a duplex LC optical connector interface. This makes it different from parallel 100G modules such as QSFP-100G-SR4-S or QSFP-100G-PSM4-S, which use MPO connections. The duplex LC interface suits two-fiber single-mode cabling already common in backbone and inter-building fiber plants.
QSFP-100G-LR4-S is used in Cisco platforms that support 100G QSFP or QSFP28 optical modules, including selected Cisco Nexus, Catalyst, ASR, NCS, and compatible line-card environments. Compatibility is platform and software dependent, so the exact chassis, supervisor, line card, and software release should be checked before deployment.
QSFP-100G-LR4-S is used for 100G single-mode fiber connections where a duplex LC link must reach up to 10 km. Common roles include core-to-distribution uplinks, data center interconnects, campus backbone links, and long-reach aggregation paths where multimode SR optics do not provide enough distance.
QSFP-100G-LR4-S fits enterprise, service provider, and data center networks that already operate 100G interfaces over single-mode fiber. It is most relevant when switch or router ports need high-capacity optical handoff across buildings, rooms, campuses, or facilities without changing to parallel MPO cabling.
QSFP-100G-LR4-S links suit high-volume east-west and north-south traffic where 100G bandwidth is required across single-mode fiber. Typical workload patterns include storage replication, aggregation uplinks, routed core transport, virtualization clusters, backup traffic, and high-throughput interconnects between network tiers or facilities.
QSFP-100G-LR4-S works well for 100G data center interconnects within its 10 km single-mode reach limit. The duplex LC design supports standard two-fiber SMF paths, while the 100GBASE-LR4 standard avoids the need for MPO parallel fiber. Link budget, fiber loss, and platform support still require validation.
QSFP-100G-LR4-S complies with IEEE 100GBASE-LR4 requirements. That standard is important when planning interoperability with other 100G LR4 optics and platforms. Cisco platform support remains the main purchasing check, because Cisco optics compatibility depends on both the hardware port and the running software version.
QSFP-100G-LR4-S follows the IEEE 100GBASE-LR4 specification, which does not employ FEC for the LR4 link. This separates it from several newer 100G single-wavelength or extended-reach modules that use host-based FEC. Engineers should still match interface configuration to the Cisco platform guidance.
QSFP-100G-LR4-S requires duplex single-mode fiber with LC connectors for 100GBASE-LR4 operation. The fiber path should be based on G.652 SMF or an equivalent qualified single-mode plant. Multimode patch cords, copper DAC cables, and MPO parallel trunks are not the correct cabling choices for this module.
QSFP-100G-LR4-S integrates with Cisco Nexus environments when the specific Nexus switch, line card, NX-OS version, and port type support this Cisco 100G QSFP optical module. It is commonly evaluated for Nexus 100G uplinks, spine-leaf interconnects, and long-reach single-mode connections between aggregation or core layers.
QSFP-100G-LR4-S is a 100GBASE-LR4 module using four wavelengths over duplex SMF up to 10 km, while QSFP-100G-LR-S is a 100GBASE-LR1 module using a single wavelength with PAM4 and FEC. LR4 suits designs standardized on legacy LR4 optics, while LR-S suits newer LR1-based 100G links.
QSFP-100G-LR4-S supports up to 10 km over single-mode fiber using 100GBASE-LR4, while QSFP-100G-CWDM4-S supports up to 2 km over SMF with duplex LC. QSFP-100G-LR4-S is the stronger fit when the link distance exceeds CWDM4 reach or when LR4 interoperability is required.
QSFP-100G-LR4-S is the 10 km LR4 option, while QSFP-100G-ER4L-S is an ER4-Lite module for longer single-mode links up to 40 km with FEC needed for full reach. QSFP-100G-LR4-S is normally selected for standard 10 km LR4 paths where extended-reach optics are unnecessary.
QSFP-100G-LR4-S uses duplex LC single-mode fiber for up to 10 km, while QSFP-100G-PSM4-S uses MPO parallel single-mode fiber for up to 500 m. LR4 is better suited to longer two-fiber backbone links, while PSM4 fits shorter 100G links where MPO parallel cabling is already deployed.
QSFP-100G-LR4-I is the industrial-temperature LR4 variant, not a direct replacement for every QSFP-100G-LR4-S deployment. Both support 100GBASE-LR4 over 10 km SMF with duplex LC. The I version is selected where industrial temperature support is required, while the S version fits standard supported operating environments.
QSFP-100G-LR4-S pricing depends on condition, quantity, sourcing route, and current Cisco optics availability. ORM Systems can quote new or refurbished options when supply allows. Buyers comparing Cisco 100G LR4 optics should request a live quote because enterprise transceiver pricing often changes with market stock and lead time.
QSFP-100G-LR4-S is commonly sourced through new, surplus, and refurbished enterprise hardware channels depending on market availability. ORM Systems supports quotation for both new and refurbished condition options where stock exists. Refurbished optics are especially relevant for network refreshes, spares, and matching existing Cisco 100G LR4 deployments.
QSFP-100G-LR4-S availability should be confirmed at quotation stage because Cisco optics supply changes by region, channel, and lifecycle status. ORM Systems can check current availability for the exact SKU and help source equivalent Cisco-supported options where required. Lead time depends on requested condition and order quantity.
QSFP-100G-LR4-S lead time depends on live stock, condition, testing requirements, order size, and shipping destination. In-stock refurbished or surplus units usually move faster than special-sourced new units. ORM Systems can provide current lead time during quotation so network teams can plan maintenance windows and rollout dates accurately.
Bulk pricing is available for QSFP-100G-LR4-S when quantity, condition, and supply position support a volume quote. This is useful for 100G refresh projects, spare pool builds, and multi-site deployments requiring matched Cisco LR4 optics. ORM Systems can quote staged delivery or consolidated purchasing for larger transceiver orders.
New QSFP-100G-LR4-S modules suit projects requiring unused Cisco hardware, while refurbished modules suit cost-controlled refreshes, replacements, and spare inventory. The best choice depends on budget, compliance requirements, and rollout timing. Tested refurbished optics can offer strong value when the deployment already standardizes on Cisco 100G LR4 modules.
QSFP-100G-LR4-S orders from ORM Systems can include warranty coverage based on condition, source, and quote terms, with up to 3-year warranty available on eligible tested hardware. Buyers should confirm the exact warranty period on the formal quote because optics condition and sourcing route affect coverage.
Refurbished QSFP-100G-LR4-S modules should be tested before dispatch to confirm identity, optical behavior, connector condition, and basic operational readiness. ORM Systems supplies tested enterprise hardware, which helps reduce risk when the module is being used for replacement, spare stock, or scheduled 100G network maintenance.
QSFP-100G-LR4-S complies with IEEE 100GBASE-LR4 for 100G Ethernet over single-mode fiber. It uses a duplex LC optical interface and supports 10 km reach over G.652 SMF. Buyers should also confirm platform-level Cisco compliance, because approved transceiver operation depends on the exact host device and software release.
QSFP-100G-LR4-S installs into a compatible Cisco 100G QSFP port as a hot-pluggable optical module. The LC duplex single-mode fiber patch lead connects after insertion and inspection. Network teams should clean fiber end faces, check receive power, confirm interface status, and validate the link against the planned 100G configuration.
QSFP-100G-LR4-S does not usually require a separate optic license, but the host platform must support the module, the 100G port, and the running Cisco software release. Feature licensing can still apply to the switch or router platform itself, especially for routed interfaces, advanced services, or higher-level network functions.
QSFP-100G-LR4-S can be purchased through ORM Systems for UK buyers needing Cisco 100GBASE-LR4 QSFP28 optics. ORM Systems can quote new or refurbished availability, provide condition details, and support bulk purchasing. Buyers should share the target platform and quantity so the quote matches the planned deployment.
ORM Systems ships enterprise IT hardware internationally where export, courier, and sourcing requirements are satisfied. QSFP-100G-LR4-S can be quoted for international buyers with destination details, required quantity, and condition preference. Shipping cost, delivery time, and documentation depend on the destination country and order value.
United States
