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

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.