telecom@ucbvax.ARPA (05/10/85)
From: Jon Solomon (the Moderator) <Telecom-Request@BBNCCA>
TELECOM Digest Thu, 9 May 85 16:37:07 EDT Volume 4 : Issue 189
Today's Topics:
Auto ringback
DTN
Re: TELECOM Digest V4 #187
Telephone wiring diagram?
Hearing on public telephones
Re: TELECOM Digest V4 #187 - Telephone wiring diagram
----------------------------------------------------------------------
Date: 6 May 1985 11:31-EDT
Subject: Auto ringback
From: WTHOMPSON@BBNF.ARPA
To: Telecom@BBNCCA.ARPA
Cc: WThompson@BBNF.ARPA
Does anyone know a number to call to get automatic ringback (for testing
lines) in the Nynex area? More specifically, in the New England Tel.
area? More specifically, in the Boston area?
Tks,
- Bill Thompson
(WThompson@BBNF)
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Date: Monday, 6 May 1985 09:13:36-PDT
From: goldberg%viking.DEC@decwrl.ARPA (Marshall R., PCSG LJ02/E4 DTN 282-2325)
To: telecom@bbncca
Subject: DTN
DTN (Digital Telephone Number) is Digital's internal telephone number prefix.
For our site, the internal DTN prefix is 282 but on the outside one
uses 486.
Marshall
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Date: Tue 7 May 85 01:42:26-EDT
From: Robert Scott Lenoil <G.LENOIL%MIT-EECS@MIT-MC.ARPA>
Subject: Re: TELECOM Digest V4 #187
To: Faunt%hplabs.csnet@CSNET-RELAY.ARPA
Date: Wed 1 May 85 20:01:31-PDT
From: Doug <Faunt%hplabs.csnet@csnet-relay.arpa>
Subject: Telephone wiring diagram?
To: telecom@bbncca.ARPA
I have a old Trimline telephone that I'd like to get
wired correctly. It is a '69 vintage unit that requires
a transformer for lighting the buttons.
I've managed to get the switch-hook wiring sort-of figured out,
but can't seem to get the bell to work properly.
The bell has five wires coming out of the bell, colored:
Red, Black, Blue, Slate, Slate/Red
The terminal plate has a capacitor between terminals K and A.
The rest of the terminals are marked L1, L2, 1, 3, 4, B, F, G, and C
The handset has 5 leads: Red and Green are Tip and Ring, Black and
White are the lighting circuit, and Yellow is ?
Does anyone have a wiring diagram?
faunt%hplabs@CSNET-RELAY.ARPA
-------
You only need connect two of the wires from the ringer. I forget which two,
but experimentation will quickly resolve that. Anyways, one of these wires
should be connected to the terminal closest to the one labelled F. This
terminal should be unused. The next wire should go to the C terminal. On
my phone, there are two terminals labelled C; I ran it to the one furthest
from the H terminal, as shown:
RR C
H
C B
^
Connect here
Note that I arrived at this wiring via experimentation on my Princess phone,
which I no longer have with me, so I can't check on this. (This was written
down though, not from memory.)
-Robert
-------
------------------------------
From: Miriam Clifford <dmimi%ecsvax%mcnc.csnet@csnet-relay.ARPA>
Date: 6 May 85 10:23:44 EDT (Mon)
Subject: Hearing on public telephones
To: telecom%ucbvax%arpa@Berkeley
[]
The pay phones that are not hearing aid compatible may be a decision,
however thoughtless, of the local telephone company.
A protest could be lodged (presumably pay phones should be equally
accessable to all) and, at least, an educational campaign launched to
prevent such stupidity (if possible) and to correct such conditions
when they are found. There is no valid reason not have ALL phones
hearing aid compatible, as far as I know. Those that are, are equally
usable by the non-hearing-impaired, and have no disadvantages that I
am aware of.
A national organization exists to help hearing impaired persons help
themselves--I've forwarded the original message to them. You might want to
support their efforts:
Self Help for the Hard of Hearing (SHHH)
7800 Wisconsin Ave
Bethesda, MD 27814
301-657-2248
{decvax,ihnp4,akgua}!mcnc!ecsvax!dmimi
Mimi Clifford
2535 Sevier St
Durham, NC 27705
919-489-4821 919-684-2854 (Wed)
------------------------------
Date: Tue, 7 May 85 09:46:52 pdt
From: dual!paul@Berkeley (Paul Wilcox-Baker)
To: telecom@Berkeley
Subject: Re: TELECOM Digest V4 #187 - Telephone wiring diagram
> I have a old Trimline telephone that I'd like to get
> wired correctly. It is a '69 vintage unit that requires
> a transformer for lighting the buttons.
> I've managed to get the switch-hook wiring sort-of figured out,
> but can't seem to get the bell to work properly.
> The bell has five wires coming out of the bell, colored:
> Red, Black, Blue, Slate, Slate/Red
The bell is usually wired as follows:
Slate/Red to A
Slate to K
Red to L2
Black to L1
The Blue wire I have never encountered before. I would leave it
isolated.
> The terminal plate has a capacitor between terminals K and A.
> The rest of the terminals are marked L1, L2, 1, 3, 4, B, F, G, and C
> The handset has 5 leads: Red and Green are Tip and Ring, Black and
> White are the lighting circuit, and Yellow is ?
In Trimline phones all the speech circuitry is in the handset part.
The base seems to contain only the bell, the terminal strip and
hook-switch.
Paul Wilcox-Baker.
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End of TELECOM Digest
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