[VoIP] AECo 801 Test Handset (Buttinsky) question

[Steph Kerman]

"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

Rusty Dekema wrote:
> Could someone please elaborate on what is meant by a "customer carrier
> line" in this sense? Was this a type of data circuit?
>
> Rusty
>
> On 6/8/07, Steph Kerman <stfkerman at jps.net> wrote:
>   
>> The 801 is the orange test set with small "Styleline" dial.
>>
>> According to GSP 100-203-100 Issue 3, "a low pass filter kit ...
>> consisting of an inductor assembly ..., an inductor assembly holder ...
>> and a resistor-capacitor assembly is available.  This filter kit allows
>> the 801 hand test telephone to attach to customer carrier lines without
>> disruption of carrier frequencies."  The kit is installed on the
>> receiver bracket assy.
>>     
>
>