While listening to Arthur Marsh Pete heard:What do you think of this line

G'day Arthur

 PC> ³ Speed                       16800 ³
 PC> ³ Symbol Rate             3429/3429 ³

 PC> So what do you think, wet string or what :-(

 AM> Wide bandwidth, low S/N ratio...

 PC> So why do i only get low connects, BTW the connect rate has
 PC> fallen to about 14400 using the courier calling that system.

 AM> OK, to get a good symbol rate, you need a wide audio bandwidth
 AM> (300-3400 Hz with minimal roll-off). To get a good number of
 AM> bits per symbol, you need a good signal to noise ratio (e.g. 38
 AM> dB).

Below is a repost of the line probe, bandwidth isn't that good, on a
normal connect i have about 20 freq points from 1k up to about 3.7k,
in the one below only 6.

 Channel Probe:
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
³ -26 ³ Ü ù ù ù ù ù ³   0 ³
³ -28 ³ Û ù ù ù ù ù ³   2 ³
³ -30 ³ Û ù ù ù ù ù ³   4 ³
³ -32 ³ Û Û Ü Ü ù ù ³   6 ³
³ -34 ³ Û Û Û Û Ü ù ³   8 ³
³ -36 ³ Û Û Û Û Û ù ³  10 ³
³ -38 ³ Û Û Û Û Û ù ³  12 ³
³ -40 ³ Û Û Û Û Û Û ³  14 ³
³LevelÀÄÄÄÄÄÄÄÄÄÄÄÄÄÙAtten³
³       1 3 3 3 3 3       ³
³       0 0 3 3 4 6       ³
³       0 0 0 5 5 0       ³
³       0 0 0 0 0 0       ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ


 AM> In your case you may have multiple PCM stages
 AM> (Digital-Analogue-Digital conversions). 16800 bps isn't that
 AM> uncommon on international V.34 calls.

This call isn't ISD it's local to a small town about 30km away.

   -=Pete=-


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