Susanne, I am glad to hear from you again.
This following is a little info on T3 from an earlier Treg email that might be of use to you. Best Regards, Paul Smith, Teradyne, Boston "Pete Van Raalte" <[email protected]> on 09/09/98 04:08:52 PM Please respond to [email protected] To: [email protected] cc: (bcc: Paul J Smith/Bos/Teradyne) Subject: Re: a-law/mu-law Doug Mckean's input helped explain the T1 - E1 story. 1) Now can anyone tell me the pertinent specs for E1? I'm familiar with CCITT recommendations G702, Q421, etc, but these refer to "digital signalling." None of the CCITT recommendations mention "E1" to my knowledge. Where did the term come from? Is it specifically mentioned in any spec? 2) I know lots of specs for T1, although everyone (ANSI, ATT, & Bellcore) refers to it as "Primary Rate". Is there a spec for "T1"? This seems to be another bit of jargon in common use everywhere but in the specs. Pete ____________________________________________ > Leave it to the Western Electrics to use something almost > too simple like the alphabet to use for designations. > And I've heard many use T1 and DS1 interchangably. > In fact, I think the spec actually calls out "DS-1" > and doesn't really reference T1. > > According to Harry Newton's > _Newton's Telecom Dictionary_, 1992, page 871: > > he states the following - > > "... Outside the United States and Canada, the "T-1" line > bit rate is usually 2,048,000 bits per second. Japan, > France and West Germany impose slight variations that > make their formats unique. Only one element remains > constant - the DS-0. The 64 kilobit per channel is > universal. ..." > > I thought the E-1 rate was standard no matter where it's used. > Harry's saying there are "slight variations". > What's that supposed to mean? > > Also in Harry Newton's > _Newton's Telecom Dictionary_, 1992, page 870: > > he lists the following - > > "... North American Designator (DS LEVEL) > > T1 (DS-1) 1.544 Mbps 24 voice channels > T1C 3.152 Mbps > T2 (DS-2) 6.312 Mbps 96 voice channels > T3 (DS-3) 44.736 Mbps 672 voice channels > T4 (DS-4) 274.176 Mbps 4032 voice channels > > Japanese Hierarchy - DS Level > > DS-1 1.544 Mbps 24 voice channels > DS-2 6.312 Mbps 96 voice channels > DS-3 32.064 Mbps 480 voice channels > DS-4 97.728 Mbps 1440 voice channels > DS-5 400.352 Mbps 5760 voice channels > > European (CEPT) DS Level > > DS-1 2.048 Mbps 30 voice channels > DS-2 8.448 Mbps 120 voice channels > DS-3 34.368 Mbps 480 voice channels > DS-4 139.268 Mbps 1920 voice channels > DS-5 565.148 Mbps 7680 voice channels ..." ---------------------------------------------------------------------------- Peter Van Raalte | Email: [email protected] Compliance Engineer | V-Band Corporation | Phone: 914-789-5117 565 Taxter Road | Elmsford NY 10523 | FAX: 914-347-3432 --------------------------------------------------------------------------- "Delisle, Susanne" <[email protected]> on 12/07/98 03:11:51 PM Please respond to [email protected] To: [email protected] cc: (bcc: Paul J Smith/Bos/Teradyne) Subject: Wander requirements for T3? Does anyone know if there are any published specs for wander on T3 lines? There doesn't seem to be any regulatory requirement, but is there any published limit or guideline? Thanks, Susanne Delisle Compliance Engineer Lucent Technologies
