"DS0 CP" 56KB digital interface for one 64KBPS DS1(T1) facility.
Before pindrop AT&T stuffed together a D4 no E&M signalling card and a A7 L carrier channel bank card
24 cards and in a bank, you had what was called an LT connector.
Then pin drop.
Then no more L and all fiber into the 4ESS, and now VOIP, and soon no 4ESS's. SNiff Sniff.
Date: Thu, 26 Jul 2012 12:02:39 +0000
Subject: [coldwarcomms] Re: Available ATT gear
Right, D4, used mainly on T1 & other digital lines.
--- In firstname.lastname@example.org, David <wb8foz@...> wrote:
> but post Coldwar, I'd say.
> Some flavor of channel bank, I think.
> It's up 270 from DC & must go by month's end.
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