34 Years of the Digest ... founded August 21, 1981
Copyright © 2015 E. William Horne. All Rights Reserved.
The Telecom Digest for Aug 30, 2015
|I think opinions should be judged of by their influences and effects; and if a man holds none that tend to make him less virtuous or more vicious, it may be concluded that he holds none that are dangerous, which I hope is the case with me|
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|Date: Sat, 29 Aug 2015 09:51:47 -0400 From: Eric Tappert <firstname.lastname@example.org> To: email@example.com. Subject: Re: Southern New Jersey residents want fairness from Verizon Message-ID: <firstname.lastname@example.org> On Thu, 27 Aug 2015 21:47:50 -0700 (PDT), Neal McLain <email@example.com> wrote: >On 26 Aug 2015 08:54:54 GMT, firstname.lastname@example.org > (Rob Warnock) wrote: > >> John Levine <email@example.com >> wrote: >> +--------------- >> | One of the things I've always wondered is if they get away >> | with the Voicelink stuff and they abandon all of the wires, >> | how's the mobile backhaul going to work? >> +--------------- >> >> Well, from the cell towers to the COs, point-to-point microwave, >> of course. ;-} [Or fiber. Maybe.] The real question is if >> they abandon all of the wires, how are they going to power the >> cell towers, especially during emergencies after the batteries >> run out?!?!? [Solar? No. Think hurricanes. Or blizzards. Or >> haboobs. Or smoke from wildfires.] > >As others have pointed out, cell towers don't get their operating power from >central offices -- they get it from local electrical power utilities. Check >out any cell tower and you'll see power lines feeding equipment buildings. [Moderator Snip] >Whatever the situation, the equipment gets operating power from the local >power utility, either as a direct customer or as part of a lease agreement >with a third party building owner. > >***** Moderator's Note ***** > >When ILECs were still leasing PBXes, it was common for the PBX backup >batteries to be charged from the CO, using multiple pairs of wire in a >trunk cable. Bill, I'm going to call you on this one. Write the equations and you'll find a single telephone pair is incapable of providing more than about a Watt or so of power remotely, It is inconceivable that any telco would use hundreds of pairs to charge a battery for a PBX, The battery supplied power to the switch and was charged by local power, thus the switch operated on local power.What PBX's did have was a throwover to allow a phone to operate as a standard line when power failed so that all communication capability wasn't lost.. On the other hand, that Watt or so is enough to power a repeater or a regenerator on a carrier system, although many of those systems used higher voltages than the standard 48 Volt plant.. So, citation please.... Eric Tappert ***** Moderator's Note ***** I don't have one, sorry. Right after I started out, I asked a "rated" man why certain pairs were designated for "battery supply", and he said they were for charging PBX batteries. Anyone else have a citation? Bill Horne Moderator|
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