[VoIP] AECo 801 Test Handset (Buttinsky) question

[Steph Kerman]

YW
SK

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