Cisco QSFP-40G-LR4-S= 40GBASE-LR4 S-Class QSFP Transceiver 10km SMF LC
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Cisco
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Cisco QSFP-40G-LR4-S — 40GBASE-LR4 S-Class QSFP
40 Gigabit EthernetUp to 10 kmG.652 SMFDuplex LC
The Cisco QSFP-40G-LR4-S is an S-Class 40GBASE-LR4 QSFP optical transceiver designed for 40 Gigabit Ethernet links over standard G.652 single-mode fibre. It supports distances of up to 10 km using a standard pair of fibres terminated with duplex LC connectors. The 40G signal is carried across four wavelength-multiplexed optical lanes within the module.
Compatibility — check before buying:
This is the S-Class QSFP-40G-LR4-S variant for 40GBASE Ethernet. Cisco states that it supports the 40GBASE Ethernet rate only and does not support FCoE. Do not confuse it with the QSFP-40G-LR4 version, which is a different product and additionally supports OTU3 data rates. Confirm that your Cisco switch, router or line card supports this exact transceiver before ordering.
Best For
✓ 40 Gigabit Ethernet fibre uplinks
✓ Single-mode links up to 10 km
✓ Data-centre and campus backbone connections
✓ Cisco platforms supporting QSFP-40G-LR4-S
Key Features
40GBASE-LR4 over two fibre strands
Unlike parallel-fibre 40G SR4 optics, the LR4 module uses a standard duplex single-mode fibre pair with LC connectors. Four optical wavelengths are multiplexed onto the same transmit fibre and separated again at the receiving end.
Up to 10 km on G.652 SMF
Cisco specifies operation over standard G.652 single-mode fibre at distances up to 10 kilometres, making the module suitable for longer backbone and inter-building connections.
Four CWDM wavelengths
The 40G Ethernet signal is transmitted using four optical lanes centred at approximately 1271, 1291, 1311 and 1331 nm. Multiplexing and demultiplexing are handled internally by the transceiver.
Cisco S-Class Ethernet optic
QSFP-40G-LR4-S is Cisco's S-Class LR4 model and is specifically intended for 40GBASE Ethernet operation. It does not provide FCoE support and should not be substituted for the non-S LR4 model where OTU3 capability is required.
Technical Specifications
Frequently Asked Questions
Singular Expert Insight
The key buying detail is the -S variant. Physically it provides the familiar 40GBASE-LR4 combination of duplex LC, single-mode fibre and up to 10 km reach, but Cisco positions this S-Class model specifically for 40 Gigabit Ethernet. If your application needs FCoE or the additional OTU3 capability associated with Cisco's non-S LR4 module, do not treat the two part numbers as interchangeable. For a normal supported 40G Ethernet LR4 link, the QSFP-40G-LR4-S provides four internally multiplexed wavelengths over only two fibre strands.
Buyer’s Guide
Buy it if
You need a Cisco S-Class 40GBASE-LR4 optic for a supported 40G Ethernet port, using duplex G.652 single-mode fibre for a link up to 10 km.
Skip it if
Your network uses multimode fibre, requires an MPO-based SR4 connection, needs FCoE, or requires OTU3 support rather than Ethernet-only operation.
Also consider
Cisco QSFP-40G-LR4 if OTU3 support is required, or a Cisco 40GBASE-SR4 optical module when your installation uses short-reach multimode fibre instead.
Features - Cisco - QSFP-40G-LR4-S=
More Details
Product Code
6779H67
EAN Code
0882658786167
Manufacturer
Cisco