QDD-4X100G-FR-S Cisco Compatible 4x100G QSFP-DD Transceiver

The EDGE 400G-QSFP-DD-2 is a direct replacement for the Cisco QDD-4X100G-FR-S, coded with Cisco-recognized EEPROM data so NX-OS accepts the module without workaround commands. This 400G QSFP-DD module uses an MPO-12/APC connector with four parallel 1310nm lanes for 4x100G breakout over single-mode fiber at up to 2km reach.

The module transmits four independent 100G lanes at 1310nm using PAM4 modulation at 53.125 GBaud per lane. An internal DSP aggregates pairs of 50G PAM4 electrical lanes from the 8-lane QSFP-DD host interface into single 100G PAM4 optical lanes, performing 2:1 electrical lane bonding per optical output. Each optical lane carries 100G over a dedicated fiber pair within the MPO-12 cable, supporting up to 2km over OS2 single-mode fiber. Operating temperature is 0 to 70°C commercial. Maximum power consumption is 10.5W.

Each 100G lane follows the 100GBASE-FR1 specification from IEEE 802.3cu, which mandates KP4 RS-FEC (Reed-Solomon 544,514) on the host platform to meet the PAM4 bit error rate target. On current Cisco Nexus 9300-GX2 and 93600CD-GX line cards, KP4 FEC is the default for 100G-FR1 sub-ports. On earlier NX-OS releases or other QSFP-DD platforms, verify FEC status with show interface ethernet X/Y fec and configure RS-FEC explicitly if not already active. CMIS diagnostic monitoring reports per-lane transmit and receive optical power, temperature, supply voltage, and bias current.

QDD-4X100G-FR-S is deployed on Cisco Nexus 9000 platforms with QSFP-DD ports, including the Nexus 9300-GX2, 93600CD-GX, and 9336C-FX2-E. Not all Nexus 9000 switches include QSFP-DD slots, so confirm your line card has QSFP-DD ports before ordering. Each 400G QSFP-DD port breaks out to four independent 100G interfaces. The EDGE module ships pre-coded with Cisco-recognized EEPROM data, so no "service unsupported-transceiver" command or other workaround is required.

For 4x100G breakout, use an MPO-12/APC to 4xLC/APC single-mode harness cable. Each LC pair connects to a 100G-FR1 or 100G-DR1 remote port; verify the polish on the remote transceiver before ordering, since some 100G-FR1 implementations use LC/UPC on the ferrule. This module differs from QDD-400G-FR4-S, which uses four CWDM wavelengths on a duplex LC as a single 400G link.

At 2km over OS2 single-mode fiber, ITU-T G.652 specifies maximum attenuation of 0.4 dB/km at 1310nm, so fiber loss consumes up to 0.8 dB. MPO and LC connector pairs plus any field splices must fit within the remaining 3.2 dB of the 4 dB channel budget per IEEE 802.3cu. Clean and inspect all connector endfaces per IEC 61300-3-35 before mating to avoid the multi-dB loss that contaminated endfaces introduce at PAM4 rates.

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