Part Number:DS100MB203
Hi Sir：
In our applications，transmit four SFP+ signals to QSFP+ , the schematic diagram such as attachments. Between SFP+ and QSFP+, use two DS100MB203 to change the signal path. We’ve designed the circuit card, but the signal only run up to 4.25Gbps. When it work in 10.3125Gbps, there is no link.
I have the query as:
- We use two DS100MB203 in tandem, are we using MB203 in here correctly? What attention should be paid to this use.
- I know，there is a need for AC coupling capacitors between MB203, but, between SFP+ and DS100Mb203，is there a need for AC coupled capacitors? At the same time, Between QSFP+ and DS100Mb203, is it necessary? When I was testing, with or without capacitors, it can pass through 4.25Gbps, but 10.3125Gbps won’t make it.
- Currently, I’m in pin mode, working voltage is 3.3v, MODE try using either “0” or “1”. EQ_D1=0,EQ_D0=0,EQ_S1=0,EQ_S0=0.
DEM_D1=0,DEM_D0=0,DEM_S1=0,DEM_S0=0.
Is this a good setting?
- Previous question mentioned channel attenuation, I didn’t think about it before. On my board, differential line length between SFP+ and DS 100MB203 is about 1 inch. The length of two MB203 is about 7.2inch. What are the requirements for the length of the signal line?
Look forward to your reply. Thank you.
