Section 25: POTS Tab
T
ieline
Page 243
T E C H N O L O G Y
The bit rate reaches the maximum bit rate specified by the menu;
The bit rate reaches the maximum codec bit rate of 33,600 bps; or
The codec is using a less than perfect line and the codec can only
negotiate a bit rate lower than the specified maximum bit rate. If the
codec is operating at a line quality of less than 70%, it won’t renegotiate
up any further.
Actual line quality is displayed on the codec
LCD
screen.
25.6.
Monitor Enable
The modem dialing and connection process can be heard through the
headphones by checking the
Monitor enable
function. When checked, dial up
(DTMF) tones are heard in the headphones. If you are having difficulty
connecting, it I useful to hear the connection tones to ensure your line is
operating effectively.
25.7.
Detect Dial Tone
By checking the
Detect dial tone
function the codec will wait until a dial tone is
present before dialling.
If left unchecked, the codec will not wait until a dial tone is present before
dialling, it just commences dialling. Use this setting if there is any difficulty in
detecting a dial tone.
25.8.
Detect Progress Tone
If this function is unchecked, the codec does not test for a telephone system
connection tone at the conclusion of dialing. (e.g. “busy” tone). It assumes
successful link establishment, and starts line negotiation.
If this function is checked, the codec
tests for telephone system connection tones
at the conclusion of dialing. (e.g. “busy” tone).
25.9.
Disable Line Quality
In rare situations it is possible that a POTS connection may drop out for no
apparent reason, even if the line quality is good. If this occurs, it is possible that
stability may be increased by disabling the line quality (LQ) display on a codec’s
LCD
screen. This will not affect codec audio settings at all – it will only remove
the line quality display from the
LCD
screen. Do not check the
Disable Line
Quality
box unless you are having disconnection problems.
