[ MODEL-SPECIFIC NETWORK HARDWARE RECORD ]
Cisco QSFP-40G-LR4 40GBASE-LR4 QSFP+ Transceiver
Four-wavelength 40GbE QSFP+ long-reach optic for single-mode fiber. Exact PID, host qualification and optical channel specifications should be checked before deployment.
IDENTIFICATION: Match the module label, vendor part number and revision to the manufacturer's documentation. Nominal link rate and maximum reach are specifications, not measured throughput or a guarantee for every installed channel.
Model-specific specifications and compatibility
| Subcategory | SFP transceivers: optical and copper |
|---|---|
| Exact product/model | Cisco QSFP-40G-LR4 40GBASE-LR4 QSFP+ Transceiver |
| Form factor | QSFP+, hot-pluggable four-wavelength 40GbE transceiver. |
| Optical interface | 40GBASE-LR4; four LAN-WDM/CWDM optical channels near 1271, 1291, 1311 and 1331nm multiplexed over one fiber pair. |
| Nominal rate (not measured) | 40Gb/s aggregate Ethernet rate across four optical wavelengths. |
| Wavelength and reach | Up to 10km on single-mode fiber, per Cisco’s 40G QSFP data sheet. |
| Connector and fiber type | Duplex LC; single-mode fiber (SMF). |
| Host coding and compatibility caveat | Requires an explicitly supported Cisco 40GbE QSFP+ host port and exact PID. Check Cisco’s TMG matrix for model and software qualification; code recognition, operating mode and DOM behavior are host dependent. Do not substitute SR4 or an incompatible LR4-coded third-party part based only on cage fit. |
| Variant / deployment caveat | LR4 uses multiplexed wavelengths and duplex SMF, unlike parallel-fiber SR4. Match LR4 at both ends and remain within the channel loss/reach budget. |
| Measured throughput | No bench result is claimed. Actual payload throughput depends on the host, link partner, protocol overhead and test method. |
Host qualification and installation notes
Requires an explicitly supported Cisco 40GbE QSFP+ host port and exact PID. Check Cisco’s TMG matrix for model and software qualification; code recognition, operating mode and DOM behavior are host dependent. Do not substitute SR4 or an incompatible LR4-coded third-party part based only on cage fit.
LR4 uses multiplexed wavelengths and duplex SMF, unlike parallel-fiber SR4. Match LR4 at both ends and remain within the channel loss/reach budget.
Check both endpoint modules, fiber grade, polarity, connector cleanliness and host port configuration. Verify the exact transceiver PID and revision against the current manufacturer compatibility source before placing the link in service.
Archival, ESD and fiber-safety notes
Record the exact PID, hardware revision, host port, firmware/software release and available digital optical diagnostics. Store the module in ESD-safe packaging with dust caps fitted. Never look into an active fiber or transceiver aperture.
Manufacturer sources
- Cisco 40GBASE QSFP Modules Data SheetCisco 40GBASE QSFP+ module specifications, including LR4.
- Cisco Transceiver Module Group (TMG) MatrixCisco host-platform, software-release and transceiver PID qualification lookup.
Manufacturer compatibility varies by host, release, module coding and product revision. Consult the exact product source and current host qualification before use.