00271nam a2200109 a 450000500170000002000150001708200260003210000210005824500260007926000360010530000200014120251203091810.0  a0133194922  a621.38275GRE,bD, Gre  aE.Green Jr, Paul  aFiber optic networkds  aNew JerseybPrentice-Hallc1993  axxvi,514p, 24cm