Section 25: POTS Tab
T
ieline
Page 242
T E C H N O L O G Y
25.4.
Auto Renegotiate: Overview
Very Important Notes:
Quick Negotiation Enable
is not necessary with the new POTS G3 module and it
has been removed from the POTS G3 module menus. It is still visible in
Tool
Box
software but has no impact if you are using a POTS G3 module.
In addition, the
Auto
and
Up
options have been removed from the
Reneg (Fast)
POTS G3 module menus.
In the modem stabilization period this setting is not active as
Auto
is the default
setting.
During the modem connection procedure the modem will renegotiate up if the
line quality is above 60% in stabilization mode. Renegotiation will occur up to a
possible maximum of 33,600 bps (as per the maximum bit rate connection
settings in the codec).
If line quality falls below five per cent then the modem will always renegotiate
down. Audio will be unusable if line quality is this low.
There are four different settings in relation to Line
Quality (
LQ
) in the pull-down menu within
Tool
Box
.
Disable
is the setting for live program links because it
prevents data renegotiation if line conditions change. The
use of auto-renegotiation can cause unexpected program
breaks with changes in line conditions.
If
Up
is selected, a higher bit rate is used if line quality at both ends is above 80%.
If
Down
is selected, a lower bit rate is used if line quality falls below 20% at either
end. If
Auto
is selected auto-renegotiation occurs as line conditions vary and this
can be either up or down.
While
Auto renegotiate
is disabled, monitor the Line Quality to ensure it remains
higher than 20%, otherwise the codec may become unstable.
25.5.
Modem Max Bit-rate
This pull-down menu sets the maximum bit rate at which the
codec will attempt a connection. The line may be capable of
establishing a connection at a higher bit rate, but this is the
highest figure that connection will be attempted at. Reducing
this value can improve connection reliability on poor quality
lines.
The search for a higher bit rate will stop when either of the
following happens:
