Dell 407-BBZX Compatible 100GBASE-ER4 Lite QSFP28 30km/40km Module

EdgeOptic's 407-BBZX compatible is a Dell-coded 100GBASE-ER4 Lite QSFP28 transceiver built on our 100G-QSFP28-40 hardware platform. The module ships pre-programmed with EEPROM values for the 407-BBZX ordering code, so the optic identifies on the Dell host as the OEM transceiver. Dell's own product description for the 407-BBZX leads with '100GbE QSFP28 ER4-LITE, LC, SMF with NO FEC, up to 30 km'; the 40km reach figure cited elsewhere applies only when the host port has RS-FEC enabled. Both operating modes share the same optic; the difference is whether the host runs FEC.

Optically the module conforms to the 100GBASE-ER4 Lite specification. Four LAN-WDM channels at 1295.56, 1300.05, 1304.58 and 1309.14 nm each carry 25.78125 Gbps NRZ, multiplexed onto one duplex LC single-mode fiber pair. Optical budget is 22 dB with host FEC enabled (40km on G.652 SMF) and 18 dB without FEC (30km, matching Dell's own headline reach). The transmitter is an EML array; the receiver is an APD array, providing the additional sensitivity that distinguishes ER4 Lite from a standard PIN-receiver LR4. ER4 Lite is not an IEEE 802.3ba/bm subclause and is not part of the 100G Lambda MSA; the design tracks the generic ER4 Lite framework.

FEC posture is the gating choice for engineers planning 30 to 40km links. Without FEC, links close at distances up to 30km on plant operating near 0.35 dB/km attenuation. To extend reach to 40km, RS-FEC must be enabled on the connected 100GE port at both ends; the optic itself carries no internal FEC engine and is transparent to host FEC. Confirm RS-FEC support on the host MAC and verify both ends match during commissioning. Don't confuse 407-BBZX with sibling Dell ER4 Lite ordering code Q28-100G-ER4-LITE; both are Dell ER4 Lite QSFP28 ordering codes, but each EdgeOptic compatible is coded for its specific ordering reference, so order against the exact code on the BOM.

QSFP28 MSA SFF-8665 and SFF-8636 management compliance covers the electrical and software interfaces. DDM/DOM telemetry exposes per-lane TX and RX optical power, module temperature, supply voltage and laser bias current to the host. The duplex LC connector accepts standard SMF patch cords. Power draw is bounded at 4.5 W; the commercial 0 to +70 degC case-temperature range covers central-office and metro POP environments. Connector hygiene matters at ER4 Lite reach budgets; inspect and clean both end-faces before turn-up to avoid attenuation that erodes the FEC margin on 40km plant.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Ships next business day from EU stock with a lifetime warranty. For BOM verification or volume pricing, contact our sales team.