I have a switch requirement for initially providing 100M ethernet with 1G uplink which needs to scale to 1000M access ports with multiple 1G uplinks or 10G.
The 1000M ports however have to be optical while the 100M copper (RJ45) so I guess what I am really looking for is an SFP based switch. It is for a 'metro-ethernet' type service.
A possible solution is the ME4900. The data sheet mentions that the 1000base-T SFP will operate at 10/100/1000 for SGMII client interfaces. I haven't come across this before but after some research I found that the SGMII interface is a 4 pair interface. Differential TX and RX data is on two of the pairs (standard 10/100M) while the other two pairs are used for differential TX and RX clocks.
Would anyone happen to know whether this will work for 100M, 2 pair interface?
To confuse the issue 10/100/1000 copper ports on the Gig Switches - the 1000M option uses 4 pairs - Is this the same as SGMII?
Look forward to hearing from you.