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- Description
- Specifications
The SFP-50G-LR-S is a Cisco 25/50GBASE-LR SFP56 module for single-mode fiber. It runs at 25G or 50G on a 1310 nm nominal wavelength and reaches 10 km, or 15 km on engineered links where channel insertion loss stays under 8 dB.
The fiber is G.652 single-mode and the connector is dual LC/PC; APC patch cords are not supported. The transmit window is 1295 to 1325 nm in 25G mode and 1304 to 1317 nm in 50G mode.
Optical power in 25G mode runs from -7.0 to +2.0 dBm on transmit and from -14.8 to +2.0 dBm on receive. In 50G mode the transmit range is -4.5 to +4.2 dBm and the receive range is -12.5 to +4.2 dBm. Maximum power consumption is 1.5 W.
The host port needs KP1-FEC for 50G operation and KR1-FEC for 25G operation. The module belongs to Cisco's SFP56 line, which delivers 50G PAM4 or 25G NRZ optical interfaces, so the switch port must support SFP56 and the matching FEC mode.
Cisco 25G short-reach optics for the same SFP28 and SFP56 cages include the SFP-25G-SR-S, which uses multimode fiber at 850 nm.
| Designation | SFP-50G-LR-S |
| Type | 25/50GBASE-LR SFP56 module for single-mode fiber |
| Data rate | 25G and 50G |
| Wavelength | 1310 nm nominal |
| Reach | 10 km (15 km on engineered links under 8 dB insertion loss) |
| Fiber | single-mode G.652, dual LC/PC connector |
| Optical power 50G | Tx -4.5 to +4.2 dBm, Rx -12.5 to +4.2 dBm |
| Optical power 25G | Tx -7.0 to +2.0 dBm, Rx -14.8 to +2.0 dBm |
| FEC | KP1-FEC at 50G, KR1-FEC at 25G |
| Maximum power | 1.5 W |