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uk.telecom.broadband (UK broadband) (uk.telecom.broadband) Discussion of broadband services, technology and equipment as provided in the UK. Discussions of specific services based on ADSL, cable modems or other broadband technology are also on-topic. Advertising is not allowed. |
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![]() I've seen a router with a sub description of being spec (Annex A) Would someone tell me what Annex A means in terms of ADSL Router specs ? Thanks |
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#3
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![]() On Sat, 02 Jul 2005 08:47:47 GMT, "Alt Beer" wrote: Would someone tell me what Annex A means in terms of ADSL Router specs ? ADSL over POTS (standard phone lines) annex B is ADSL over ISDN Phil -- Tiscali - dialup speeds at Broadband prices, see http://bbs.adslguide.org.uk/postlist...&Board=tiscali AOL - the unlimited ISP of choice for heavy downloaders. |
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![]() On Sat, 2 Jul 2005 10:08:27 +0100, Mugwump wrote: Annex A is ADSL over PSTN as used in the UK On Sat, 02 Jul 2005 10:54:30 +0100, Phil Thompson wrote: ADSL over POTS (standard phone lines) The telephone system in the UK has been called PSTN for years, why is this bloody stupid acronym (POTS) starting to appear? Is it from the Merkins? -- Nigel M |
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![]() On Sat, 02 Jul 2005 14:13:22 +0100, Nigel Molesworth wrote: The telephone system in the UK has been called PSTN for years, why is this bloody stupid acronym (POTS) starting to appear? Is it from the Merkins? probably, dslforum.org use POTS "Annex A covers the operation of ADSL and traditional analog telephony (POTS) over the same wire at the same time. Annex B covers the operation of ADSL and digital telephony (ISDN) over the same wire. " is there a risk of confusion ie is ISDN a PSTN technology (I suspect it might be - public switched telephone network). If POTS & ISDN are both PSTN technologies I can see why you might want to use POTS to differentiate. Phil -- Tiscali - dialup speeds at Broadband prices, see http://bbs.adslguide.org.uk/postlist...&Board=tiscali AOL - the unlimited ISP of choice for heavy downloaders. |
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![]() On Sat, 02 Jul 2005 14:34:12 +0100,it is alleged that Phil Thompson spake thusly in uk.telecom.broadband: is there a risk of confusion ie is ISDN a PSTN technology (I suspect it might be - public switched telephone network). If POTS & ISDN are both PSTN technologies I can see why you might want to use POTS to differentiate. I am not sure of the official stance on this from telcos, or even if there is one, but POTS tends to get used to mean "something simpler than what this here thing uses", such as extension ports on PBXs that can't handle a system phone because they only have 1 pair, lines filtered from ADSL etc. PSTN as you say contains ISDN, and many thousands of digital systems that most definitely are not "POTS". POTS definitely originally came from the US, but was adopted mainly because it fits :-) -- SMS: Abbreviation, multiple meanings- [1] Short Message Service, cellular telephone messaging method. [2] SigMonster Sentience, when your sigmonster posts quotes about sigmonsters. |
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![]() Nigel Molesworth wrote: On Sat, 2 Jul 2005 10:08:27 +0100, Mugwump wrote: Annex A is ADSL over PSTN as used in the UK On Sat, 02 Jul 2005 10:54:30 +0100, Phil Thompson wrote: ADSL over POTS (standard phone lines) The telephone system in the UK has been called PSTN for years, why is this bloody stupid acronym (POTS) starting to appear? Is it from the Merkins? Plain Old Telephone System is a computer science term to indicate the differentiation between telephone systems and more advanced telephony systems, such as VoIP etc. |
#9
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![]() Phil Thompson wrote in : On Sat, 02 Jul 2005 14:13:22 +0100, Nigel Molesworth wrote: The telephone system in the UK has been called PSTN for years, why is this bloody stupid acronym (POTS) starting to appear? Is it from the Merkins? probably, dslforum.org use POTS "Annex A covers the operation of ADSL and traditional analog telephony (POTS) over the same wire at the same time. Annex B covers the operation of ADSL and digital telephony (ISDN) over the same wire. " Err, not quite. Why doesn't someone simply quote the standard? Or more accurately the ITU (International Telecommunications Union) recommendation? Guess that leaves it down to me then... ITU-T Recommendation G.992.1 Asymmetric digital subscriber line (ADSL) transceivers ANNEX A Specific requirements for an ADSL system operating in the frequency band above POTS ANNEX B Specific requirements for an ADSL system operating in the frequency band above ISDN as defined in ITU-T Recommendation G.961 Appendices I and II And here's what the Section 4, Abbreviations of G.992.1 has to say about POTS: POTS Plain old telephone service; one of the services using the voiceband; sometimes used as a descriptor for all voiceband services It has nothing whatsoever to do with adslforum.org The ITU is not a Merkin body. Kind regards -- Richard Perkin To email me, change the AT in the address below richard.perkinATmyrealbox.com It's is not, it isn't ain't, and it's it's, not its, if you mean it is. If you don't, it's its. Then too, it's hers. It isn't her's. It isn't our's either. It's ours, and likewise yours and theirs. -- Oxford University Press, Edpress News |
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