[ MODEL-SPECIFIC OPTICAL NETWORK HARDWARE ]
Cisco QSFP-100G-ER4L-S 100GBASE-ER4-Lite QSFP28 Transceiver
Four-channel 1310nm 100GbE QSFP28 optic for engineered SMF links up to 40km with host FEC. Confirm exact module label and host qualification before installation.
IDENTIFICATION: Match the manufacturer name, exact PID/suffix and revision to the host compatibility listing. Stated line rate and maximum reach are specifications, not measured payload performance.
Model-specific specifications
| Dedicated subcategory | SFP transceivers: optical and copper |
|---|---|
| Exact model / ordering SKU | Cisco QSFP-100G-ER4L-S |
| Form factor and optical type | QSFP28 hot-pluggable four-wavelength optical module; 100GBASE-ER4-Lite. |
| Ethernet rate and interface | 100Gb/s aggregate 100GBASE-ER4-Lite module interface; full rated reach depends on host FEC. |
| Wavelength | Four LAN-WDM channels in the 1295–1310nm region (nominal centers near 1295.56, 1300.05, 1304.58 and 1309.14nm). |
| Fiber medium and reach | G.652 single-mode fiber; up to 40km with host FEC (shorter qualified reach without FEC per Cisco documentation). |
| Connector | Duplex LC. |
| DOM / DDM | DOM supported; verify host visibility and alarms for the exact software version. |
| Operating temperature | Commercial operating case temperature: 0°C to 70°C. |
| Host switch/router compatibility | Cisco TMG must list the exact ER4L-S part number for the target switch/router and software. Enable/verify required host FEC for the 40km reach; without it, do not assume full reach. Validate loss, dispersion and receiver power; long-reach links can overload at short span. |
| Variant and deployment caveat | ER4L-S is ER4-Lite, not simply a 40km LR4 optic. Reach and interoperability depend on FEC, far-end type and host implementation; qualify both ends. |
| Measured performance | No measured specimen throughput is claimed; link payload depends on both host ports, FEC, coding, protocol overhead, fiber plant and test method. |
Host qualification and installation
Cisco TMG must list the exact ER4L-S part number for the target switch/router and software. Enable/verify required host FEC for the 40km reach; without it, do not assume full reach. Validate loss, dispersion and receiver power; long-reach links can overload at short span.
ER4L-S is ER4-Lite, not simply a 40km LR4 optic. Reach and interoperability depend on FEC, far-end type and host implementation; qualify both ends.
Clean and inspect fiber end faces, retain dust caps during storage, follow ESD precautions, and never look into an active optical port. Record the host model, port, software release, transceiver label and available DOM values when documenting a deployed link.
Manufacturer and standards sources
- Cisco 100GBASE QSFP-100G Modules Data SheetCisco’s 100G QSFP family data sheet documents ER4L-S reach and FEC caveat; Cisco TMG qualifies host/PID/release compatibility.
- Cisco Transceiver Module Group (TMG) compatibility matrixManufacturer lookup for transceiver PID, supported host platforms and software releases; confirm this exact labeled variant.
- IEEE 802.3 Ethernet standards familyEthernet PHY terminology and link-rate context; MSA-specific optics remain subject to their named module-family specifications.
Source links identify manufacturer documentation and qualification resources. Check the current documentation revision and exact hardware PID before deployment.