SFI-5.1 to OTU3/45 Gbps (2 x 23 Gbps D-QPSK) Multiplexer
The Broadcom BCM84142 is a SerDes Framer Interface Level 5 (SFI-5.1) to 2 x 23 Gbps multiplexer for use in 300-pin MSA 40 Gbps modules for DQPSK applications. The BCM84142 has an OIF-SFI-5.1-compliant 16-bit wide receive system data interface with a deskew channel operating from 2.688 Gbps to 2.85 Gbps that multiplexes and precodes the data to dual (I&Q) DQPSK transmitters (operating from 21.25 Gbps to 22.8 Gbps). There is an additional deskew lane for the SFI-5.1 interface.
The multiplexer and precoders are fully integrated that accept SFI-5.1 data along with a deskew channel copying data sequentially from each data channel. The 2-bit data is precoded with a DQPSK precoder. The SFI-5.1 timing clock is generated from the recovered clock. The extracted data can be fed to a PRBS decoder.