[VoIP] AECo 801 Test Handset (Buttinsky) question

[Rusty Dekema]

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.

Could someone please elaborate on what is meant by a "customer carrier
line" in this sense? Was this a type of data circuit?

Rusty