• Name: Gigalight CFP to QSFP28 Adapter
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The 100G CFP to QSFP28 Adapter module is a high performance, hot pluggable, and interconnect solution supporting 100G Ethernet and Telecom. The Adapter converts a CFP MSA interface to 1-port of 100GE QSFP28. It is compliant with the CFP MSA. Gigalight 100G CFP to QSFP28 Adapter module converts 10 bidirectional 10G channels to 4 bidirectional 25G channels operating at up to 28Gbps per channel. The Adapter supports FEC (Forward Error Correction) function; the user can enable the FEC function through the register configuration.



▪ Compliant to CFP Hardware Specification Version 1.4
▪ Compliant to CFP MSA Management Interface Specification Version 2.2
▪ Converts 10 bidirectional 10G lanes to 4 bidirectional 25G lanes
▪ 1 port QSFP28 TX&RX
▪ Support 100G IEEE 802.3bj NRZ FEC
▪ Transmission data rate up to 28Gbps per channel
▪ OTU4 compatible
▪ MDIO digital diagnostic interface and control capabilities
▪ Power class 1 (<4W max)
▪ Hot pluggable electrical interface

 Single 3.3V power supply

 Operating case temperature: 0°C ~ +70°C

 RoHS 6 compliant (lead free)



▪ 100GBE interconnects, IEEE 802.3ba 100GBASE-LR4(Adapter+QSFP28_LR4), IEEE 802.3bm 100GBASE-SR4(Adapter+QSFP28_SR4)
▪ High-speed core router connections & Datacom/Telecom switch
▪ Data aggregation and backplane applications
▪ Proprietary protocol and density application


FEC Control Register

FEC control register 0x91FC supports reconfiguration and save function:

1. Write value to 0x91FC; 

2. Read the address 0xA004 = 0000h(Idle);

3. Save command, writes value 0001h to address 0x91F0;

4. Read status, wait until the address 0xA004 = 0004h(save success), and then read the address again 

0xA004 = 0000h(Idle, read twice to ensure status is cleared).

Normally saving needs about 1 second, but the longest time is about 4 seconds, we suggest customer can read 0xA004 after waiting for a while.