[Asterisk-Users] X100P Echo Problems..What's going to happen?

[Don Pobanz]

On Tuesday, October 14, 2003 8:32 AM, Eric Wieling 
[SMTP:eric at fnords.org] wrote:
> Where does the 4 wire change to a 2 wire?
>

4 to 2 wires happen anywhere the signal goes from digital to a cable 
pair. First the digital signal is converted to an analog 2 wire for 
transmit and from 2 wire analog to digital for receive. On the analog 
side the signals are combined from 2 pair to 1 pair. Examples would be 
a channel unit in a channel bank or line equipment in a telephone 
switch. It can also happen in an 4 wire analog to a 2 wire analog as 
can be used to conserve cable pair but this is not as common.

Don Pobanz

> On Tue, 2003-10-14 at 03:30, Mark Spencer wrote:
> > Echo has nothing to do with TCP vs. UDP.  It's an analog phenomenon
> > that
> > occurs where the "hybrid" is, where the four-wire circuit changes 
to
> > a
> > two-wire circuit.
>
> --
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