Propagation time

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RFguy - 07 May 2008 00:41 GMT

In circuit-switched cellular voice connections (I'm mainly interested in the
AT&T network) is the propagation time constant once the connection is
established? In other words, does the trunking involve IP connections?

Admittedly, I never notice changes in voice delays on cellular calls, but
I'm asking here about constant propagation times within 0.1 usec, much
smaller than the human ear can detect.

Thanks.

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Andreas Wenzel - 07 May 2008 23:52 GMT

RFguy schrieb:

> [...]
> Admittedly, I never notice changes in voice delays on cellular calls, but
> I'm asking here about constant propagation times within 0.1 usec, much
> smaller than the human ear can detect.

You really mean 0.1micro-seconds? In that case it does not matter what
technology is used. Move one inch towards the tower and your delay
changes by about a micro second.

Andreas

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Andreas Wenzel - 08 May 2008 00:07 GMT

Andreas Wenzel schrieb:

> RFguy schrieb:
>> [...]
[quoted text clipped - 5 lines]
> technology is used. Move one inch towards the tower and your delay
> changes by about a micro second.

Opps, sorry, "slight" miscalculation. 0.1µs equals to about 100ft, not 1".

Andreas

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RFguy - 08 May 2008 01:47 GMT

Yes, that's the accuracy I need. The application is very sensitive to
propagation time. The equipment will ping the circuit when the call is set
up in order to measure round-trip delay. What I want to know is, can the
delay change during the call because of IP packet delays? If IP isn't used,
that's what I need to know.

> Andreas Wenzel schrieb:
>> RFguy schrieb:
[quoted text clipped - 10 lines]
>
> Andreas

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