QSFP-100G-LR-S Cisco Compatible QSFP28 Transceiver

QSFP-100G-LR-S is the Cisco part number for a single-lambda 100GBASE-LR QSFP28 transceiver reaching 10km over duplex single-mode fiber. The module uses PAM4 modulation on a single optical wavelength and mandatory Forward Error Correction, in contrast to the 4-lane NRZ architecture of QSFP-100G-LR4-S. The S suffix designates commercial temperature (0 to 70°C) and non-TAA.

The transmitter uses an EML (Electro-absorption Modulated Laser) in the 1304.5 to 1317.5nm range, with a PIN photodiode receiver on the far end. PAM4 encoding runs at 53.125 GBaud on one optical lane, giving a 106.25 Gbps raw line rate that yields 100 Gbps net payload after KP4 RS-FEC (Reed-Solomon 544,514). Integrated CDR (Clock and Data Recovery) re-times the PAM4 data stream at 53.125 GBaud. This single-lane design replaces the 4x25G NRZ LAN WDM architecture of LR4 with one optical lane on a duplex LC/UPC fiber pair.

The module follows the 100GBASE-LR specification in IEEE 802.3cu (Clause 140), commonly identified as LR1 in 100G Lambda MSA documents. IEEE 802.3cu specifies a 6.3 dB maximum channel insertion loss for 10km over OS2 single-mode fiber. At ITU-T G.652.D maximum attenuation of 0.4 dB/km at 1310nm, a 10km span consumes up to 4 dB of fiber loss, leaving 2.3 dB for connector insertion loss, splices, and aging. Clean LC endfaces per IEC 61300-3-35 before mating to avoid the multi-dB loss that contaminated endfaces introduce at PAM4 rates.

Cisco lists QSFP-100G-LR-S for Nexus 9300-FX2, 9300-FX3, and 9300-GX switches, Nexus 9500 with X9432C-S line cards, Catalyst 9500-24Y4C and 48Y4C, Catalyst 9600 with C9600-LC-24C line cards, and ASR 9000 and NCS 5500 platforms via supported 100G QSFP28 line cards and MPAs. Confirm the specific chassis, line card, and minimum IOS-XE, NX-OS, or IOS-XR release through the Cisco TMG compatibility matrix.

This EdgeOptic compatible QSFP-100G-LR-S is coded with Cisco-recognized EEPROM data, so the module is accepted by NX-OS, IOS-XE, and IOS-XR without the "service unsupported-transceiver" command or other workaround. SFF-8636 DDM/DOM diagnostics report transmit and receive optical power, module temperature, laser bias current, and supply voltage through standard Cisco CLI and SNMP monitoring.

KP4 RS-FEC is mandatory for single-lambda 100G PAM4 per IEEE 802.3cu and is enabled on the host platform by default for single-lambda 100G ports on current Cisco hardware; on older platforms, verify FEC status with show interface ethernet X/Y fec before commissioning. The module is based on the EdgeOptic 100G-QSFP28-SL10 platform, compliant with 100G Lambda MSA, QSFP28 MSA (SFF-8636 and SFF-8665), Class 1 FDA laser safety (IEC 60825-1), and CE/RoHS. Maximum power consumption is 4.5W.

All EdgeOptic compatible transceivers undergo optical parameter measurements, connector cleanliness testing, and EEPROM validation before shipment. For volume pricing or platform-specific compatibility questions, contact our sales team.