30 Years of the Digest ... founded August 21, 1981
The Telecom Digest for January 11, 2012
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Date: Tue, 10 Jan 2012 10:01:02 +0100 From: René Hüftlein <firstname.lastname@example.org> To: email@example.com. Subject: Different clock sources for STM-1 and E1 ?? Message-ID: <CAJ3BNFUhDSz9zs_1x1igajYvb7NaTVxg7OvwHjBdRkB4xAxFJQ@mail.gmail.com> Hi! Maybe someone here can help me with a problem we have with our PSTN gateway. We receive 63 E1's channelized into a STM-1. The E1's are provided by DTAG (German PSTN) and are multiplexed into the STM-1 provided by Verizon. STM-1 directly terminates in a Audiocodes Mediant 3000 which demultiplexes STM-1 and routes E1's respectively. We see a huge number of Controlled Slips (one in 20 seconds) and it seems this condition causes fax calls to crash. We got in contact with Verizon and they told us, that they are receiving DTAG's E1's in sync with a PDH clock and transparently multiplex that into the STM-1 which is clocked by a different master clock. (As it is not their policy to generate clock from external sources and PDH can not be used for SDH clock source - that's what they said) [For what I read on the interwebs SDH was specially designed to support relaying of PDH - so I don't really get the point...] So we receive E1's and STM-1 on different source clocks. Unfortunately Audiocodes tells us the gateway only supports one single clock source, which has to be the STM-1 or any external clock directly connected to the device. I appreciate any hints or tips on this issue (or any lesson on PSTN clocking) as I am used to deal with IP networks on the very higher layers... Cheers Ren~
Date: Mon, 09 Jan 2012 20:04:06 -0500 From: Bill Horne <bill@horneQRM.net> To: firstname.lastname@example.org. Subject: Will LightSquared's troubles push Leap into the arms of Clearwire? Message-ID: <4F0B8E86.email@example.com> from the "Editor's Corner" at FierceWireless: During a recent appearance at the Citi Entertainment, Media and Telecommunications Conference, Leap (NASDAQ:LEAP) CEO and President Doug Hutcheson was asked whether the carrier would consider a wholesale teaming or partnership with another company to supplement Leap's own LTE buildout. Answered Hutcheson: "When we make a decision on whether we invest or do a wholesale agreement we go all the way down the P&L and look at the ROI. And so to the degree that we can see attractive pricing on a wholesale basis, whether that is roaming or data, that is something that the business has been open to traditionally and would be open to in the future." Rest is at http://tinyurl.com/6nzxe7x -- Bill Horne 339-364-8487
Date: Mon, 9 Jan 2012 09:19:45 -0800 (PST) From: HAncock4 <firstname.lastname@example.org> To: email@example.com. Subject: more on at&t T-Mobile merger Message-ID: <firstname.lastname@example.org> A December article in the Philadelphia Inquirer's business section, by columnis Jeff Gelles, explores the (now DOA) AT&T/T-Mobile merger. Calls from WiFi hot spots that don't count against your minutes. Unlimited calls to a list of your favorite contacts. Shared family data plans. "Soft" data caps that slow downloads and uploads by heavy data consumers without slapping them with huge overage fees. Those are just a few of the innovations that T-Mobile has brought to the U.S. wireless market in recent years, according to a report by Federal Communications Commission staffers who reviewed AT&T Inc.'s proposed $39 billion acquisition of T-Mobile USA Inc. If there were ever any real wonder why AT&T wanted to swallow up T-Mobile - and there really shouldn't have been - the FCC has done a good job of laying it to rest. In that same report, made public Tuesday to AT&T's heated objections, FCC investigators said the merger partners exaggerated the likely benefits and understated the probable harms of a deal that would cut the number of national wireless carriers from four to three and eliminate the carrier that typically offers subscribers the lowest price. for full article please see: http://tinyurl.com/6wmww44
Date: Mon, 9 Jan 2012 09:16:44 -0800 (PST) From: HAncock4 <email@example.com> To: firstname.lastname@example.org. Subject: The FCC and low power FM radio Message-ID: <email@example.com> Because of the interest in radio of many on this newsgroup the following post is submitted. The Phila Inquirer reported on how a former "FM pirate" has been working with the FCC to grant licenses for up to 3,000 new low-power FM stations nationally. For more than a decade, a West Philadelphia buccaneer fought the Federal Communications Commission for access to the airwaves using Pete Tridish - "petri dish" - as his nom de guerre. The name took hold in 1997 when he cofounded Radio Mutiny, the pirate station whose two years on the dial helped bring "low power" to the people. This year, largely because of the efforts of Tridish and the organization he created, called Prometheus Radio Project, the FCC will grant licenses for up to 3,000 new low-power FM stations nationally, with an estimated five to 10 in the Philadelphia area. For full article please see: http://tinyurl.com/6r4zsnq
Date: Tue, 10 Jan 2012 07:18:45 -0800 (PST) From: Wes Leatherock <firstname.lastname@example.org> To: email@example.com. Subject: Re: Fwd: Telephone Exchange Names Message-ID: <1326208725.46726.YahooMailClassic@web111716.mail.gq1.yahoo.com> --- On Sat, 1/7/12, John F. Morse <firstname.lastname@example.org> wrote: > Bill Horne wrote: > > > > I came across this article in Wikipedia: hope it's of > interest. > > During the early years of telephone service, communities that > > required more than 10,000 telephone numbers, whether dial service > > was available or not, utilized exchange names to distinguish > > identical numerics for different customers. > > > > When dial service was introduced (typically during the period of > > 1910 to 1970), in such multiple exchange communities, customers > > would normally dial the first two or three letters of the exchange > > name, followed by the numeric digits. > > > > > > http://en.wikipedia.org/wiki/Telephone_exchange_names > > > > This was a common practice in the Kansas City area for exchanges > along the Kansas-Missouri border. [Moderator snip] > Both the WEstport and HIland buildings served some Kansas customers, > mainly in the Johnson County suburbs. The names were different to > keep billing separate (different tariffs, taxing, etc.). Long before > 9-1-1 so get that out of your mind. One of the other reasons for different prefixes for Kansas and Miassouri customers was so long distance calls from those numbers could be properly rated as interstate or intrastate. This occurred in many places near or on a state border with a C.O. serving customers in both states. Wes Leatherock email@example.com firstname.lastname@example.org
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