C.C. and TREG'ers: Sorry for the maybe not so funny humor below (referencing Victors tin cans). Anyway, more seriously, BABT Application Note 61 deals with this issue. It is titled "Application Notes for TERMINAL EQUIPMENT FOR CONNECTION TO ANALOGUE SPEECHBAND PRIVATE CIRCUITS". NTR 1 and NTR 2 are the U.K. standards. There are two TBR's, TBR15 and TBR17 dealing with pan-European approvals. I do not know any details on the above documents, I hope its a start.
Mel Pedersen, Midcom ---------- From: Mel Pedersen[SMTP:[email protected]] Sent: Thursday, June 12, 1997 9:51 PM To: '[email protected]' Subject: RE: Leased Lines So what's the standard for two tin cans and a piece of string? ---------- From: Duane J. Marcroft[SMTP:[email protected]] Sent: Thursday, June 12, 1997 12:51 AM To: [email protected] Subject: Re: Leased Lines Mea Culpa, Mea Culpa Too many late hours. What I was trying to say: In North America the modulation scheme is not regulated (unless it is patented and it's not your patent). It is possible to use any modulation scheme. I've used some pretty weird modulation schemes for security purposes, some are still in use. The modems on each end of the line must simply be able to mod/demod the carrier. If it does reliably with good performance and doesn't kill the operator the customer is happy. I don't know if any non-compliant modulation schemes can be used on LL's outside of North America. Quite obviously the device has to be safety and EMI compliant, but is not required to be modulation compliant with other LL modems. It also cannot smoke the lines with a KW and/or introduce garbage into adjacent lines. Geez can't get away with anything around here. If yer never in dutch, yer can't be much. Duane >HELP, > >Please let's all go back to square one: > >A technical regulations is a specification with which compliance is >mandatory by >law. > >A standard is a specification with which compliance is not mandated by any >level >of government. > >There are masses of standards for things that are not regulated in America, >certainly for >transmit levels on leased lines, believe you me. > >It is the very strength of our system that we do not need government >regulation >to produce >goods that work and work well. We certainly do need to agree on standards for >those >excellent products, or you wouldn't be able to call across the street on >two tin >cans and a >piece of string. > >Your biased observer, > > >Vic Boersma > > >"I haven't designed a LL modem for some time, but do believe they are not >regulated. As a consequence there are no longer any standards. Simply >because Leased Lines modems are not used for dial-up application or pass >through the switching gear at at the CO. The manufacturer of the modem at >each end of the line determines the modem specs and LL provider usually >specfies the maximum transmit level. Simply put there are no standards in >the U.S."
