[VoIP] AECo 801 Test Handset (Buttinsky) question

[Rusty Dekema]

On 6/8/07, Steph Kerman <stfkerman at jps.net> wrote:
> "Customer carrier", usually referred to as "Station Carrier", was used
> to add one or more "derived" customer telephone lines on a copper
> subscriber cable pair. This technology saw widespread use in the
> mid/late 60s when solid state analog implementations became available.
> Digital versions have come along in the 80s and 90s. For the analog
> forms there were two basic varieties:
>
> (1) "Add-A-Line" types where 1 derived line was added on top of the
> existing baseband copper circuit, which continued to function as before
> This is the application where the filter I asked about is needed.
>
> (2) Multi-channel types which added up to 6 or 8 customer lines. In all
> cases I know of, the copper circuit was used to power the remote
> terminal, so direct connection to the copper pair with a buttinsky would
> accomplish little other than frying the buttinsky and perhaps the
> repairman. Some of these systems placed –130V on one conductor and +130V
> on the other. I've heard numerous stories from Bell employees who were
> given "the binding posts" to clip onto for test by a repair bureau test
> person who did not realize that they were giving out the binding posts
> of a station carrier pair carrying lethal voltage.
>
> Steph

Ahhh, ok. I've heard of such systems before but not by that name.
Thanks much for the explanation.

Rusty