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To: Tim Bagwell who wrote (1174)	1/30/1998 11:08:00 PM
From: CJ Quantumwell	Read Replies (1) \| Respond to of 12623

Hi Tim, Craig is right. There is OC-96. According to Sonet standard ( you can check any sonet bellcore documents such as 253), you can have any siganl equal to direct multiples of STS-1 ( or OC-1 in Sonet ), which is 51.84Mb/s. The reason most of us seldom heard of that is in the TDM domain, it is just not economic to upgrade your equipment ( throw the old one away and put a new one in) with just " double" your transmission capacity. It seems that 4 times capacity makes more sense moneywise. BTW, 5Gb/s is used in some submarine systems but not in terrestrial at all. If we read this 400Gb/s news release carefully and technically, no where it states LU will use 5Gb/s ( they still possible may in the future, but very slim) and it said this system can transmit 2.5G and 10Gb simultaneouly. However, even the people in the exact field ( ie. optical DWDM system)have lots of questions regarding how they compose this system. ( the key questions should be 1. what kind of fiber, 2. what kind of optical amplifier 3. what channel spacing 3. what kinds of MUX and DMUX ( may be array waveguide ) 4. how do they solve four wave mixing ?) CJ