Vanguard Managed Solutions Vanguard 7300 Series - Manual (Page 127)

Operating Your Vanguard 7300 4-17
Vanguard 7300 Port Configuration
Dynamic Modem
Parameter This is a description of the Dynamic Modem parameter:
Warning
For digital interfaces the timing must be traceable back to the same clock source and/
or a Stratum 1 clock. If this is not true frame slips will occur causing the modem
traffic to loose some data. However, if the modem is using some type of error
correction and/or the modem is transporting a protocol that has error correction
(such as PPP) the clock slips will have less impact.
Warning
Modem traffic over a QUAD FXS or FXO will not run error free. The QUAD FXS
and FXO run from an internal oscillator. There is no clock synchronization between
the QUAD FXS or FXO and any other voice interface. The amount of errors and the
error rate is dependent on how close the internal oscillator is and cannot be
determined in advance. However, if the modem is using some type of error
correction and/or the modem is transporting a protocol that has error correction
(such as PPP) the errors will have less impact.
Dynamic Modem
Range: Enabled, Disabled
Default: Disabled
Description: Enable or Disable the feature of the dynamic switching to G.711
after modem detection.
If Enabled, the DSP which detects the modem tone switches to
codec G.711 regardless of the codec configured.