Your actual bandwidth or optical carrier provider can attach test equipment and tell you the actual distance as well as decibel loss of the cable. Depending on the amount of data being moved, how much it changes and other factors, it is possible that you could do the synchronous replication. However, check with EMC or DWDM (e.g. ADVA, Ciena, Cisco, Nortel, among others) suppliers to get a better assessment. Also, make sure that what you are getting for bandwidth is actually a full lambda circuit and not some variation of a slower optical bandwidth service.
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