Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Optical vs. Electrical Interfaces
"Kevin Fleming" <no@spamming.now> writes: > Tim <2207leung@hknet.com> wrote in message <35B745CD.10E8@hknet.com>... > >Kevin Fleming wrote: > >> > > >> The E3 is carried over fibre, to be sure, to you local exchange - but it > >> sounds like it is then carried over SDH to the ATM switch. > > > >The E3 is the PDH interface standard. Its spec should be referred to > >G703. It is intended to be carried over copper wire or coaxial cable. > >> > > This electrical interface will only drive coax a couple hundred metres > without repearter/regenerators, so what I had intended to mean by "carried > over fibre" was in fact a line system to the local exchange ;-) Noting, of course, that the original poster was from the University of Pittsburgh in Pennsylvania, so the one thing he probably does *not* have is an E3 signal in any format ... -- James Carlson, Consulting S/W Engineer <carlson@ironbridgenetworks.com> IronBridge Networks / 55 Hayden Avenue 71.246W Vox: +1 781 402 8032 Lexington MA 02421-7996 / USA 42.423N Fax: +1 781 402 8092 "PPP Design and Debugging" --- http://people.ne.mediaone.net/carlson/ppp |
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