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

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.