A
Alan Rutlidge
Guest
"Ross Herbert" <rherber1@bigpond.net.au> wrote in message
news:t6jsg4l3o8ntlbgs01vf0dpcqhkolpmprg@4ax.com...
2 pair internal is still the standard cable used these days.
I've probably still got one of these modules tucked away in the junk parts
bin.
Cheers,
Alan
news:t6jsg4l3o8ntlbgs01vf0dpcqhkolpmprg@4ax.com...
Hi Ross,On Sun, 2 Nov 2008 12:44:30 +0900, "Alan Rutlidge"
don't_spam_me_rutlidge@iinet.net.au> wrote:
:
:Spot on the money there Ross.
:
:As newer phones where introduced (and were still using pulse dialling),
an
:add on device called an anti-tinkle module was wired into the bell
circuit
f the phones. The module consisted of a simple circuit of
semiconductors
:and resistors encapsulated in a small epoxy block about half the size of
a
:box of matches. It had two connections - one flying grey lead and one
fixed
:spade type terminal which was wired into the bell circuit in the later
800
:series phones (both wall mount and table sets). This prevented the bells
:from tinkling when the phones were wired in parallel using only a two
wire
:cable pair, effectively eliminating the need for the third wire to the
other
hones.
:
:Cheers,
:Alan
:
While I did know about this add-on for the earlier decadic push-button
phones I
never actually used it. I considered it as a "bodgie" way of connecting
parallel
phones using only 2 wires, and they were generally not available in our
depots
anyway. It was not available already fitted to a phone so a tech had to
install
it for a customer anyway.
It only made sense to use the anti-tinkle module if an insitu cable was
installed to the point where the parallel phone was required and that
cable was
single pair, and the tech didn't feel like running a new 2pr cable, or
this
option was too difficult. A module was required in each phone as well so
it was
probably just as costly as running a new cable. Since the early 60's
internal
customer cabling was done using 2pr (or 3pr in some cases) pvc cable so
there
were usually spare conductors available even where insitu cabling was
installed.
It was just as quick to connect the third wire and modify the parallel
phone
rather than install the ant-tinkle devices.
I considered it as inferior to the 3 wire connection and I always opted
for the
old method.
2 pair internal is still the standard cable used these days.
I've probably still got one of these modules tucked away in the junk parts
bin.
Cheers,
Alan