Section 24: Connection Setup
T
ieline
T E C H N O L O G Y
Page 222
Important Connection Note:
Please ensure that you set both the local and
remote codecs to operate using the same algorithm – otherwise your codecs will
not operate correctly.
If you are using manual default profiles, when the dialing codec calls the remote
codec, the dialing codec will automatically set both the profile and the default
algorithm on the remote codec to match the dialing codec’s setting.
In addition, it is very important to note that remote control of a codec is not
possible unless you are using either the
Music, Music Plus
or
Voice G3
algorithms.
Algorithm Tip:
It is possible that when you use MPEG
algorithms to connect to
a non-
T
ieline
codec, the ’framing’ process (where incoming bit streams are
identified and distinguished for individual decoding) can be unsuccessful when a
call is initiated. This can be solved by turning off the ‘session data’ stream sent by
the
T
ieline
codec. To do this select [Menu] > [Configuration] > [System Settings] >
[Session Data] > [Disable]. Please note that this is a global setting and will also
affect all POTS, and IP connections on the codec.
If you try to connect to a
T
ieline
codec with session data disabled, you will have to
ensure that the connection settings on both codecs are identical because dialing
codec session data normally provides this information to the remote codec. To
avoid this problem, simple re-enable session data [Menu] > [Configuration] >
[System Settings] > [Session Data] > [Enable].
24.10.1.
Music
If you will be transmitting music over a connection with limited bandwidth we
recommend you use the
Music
algorithm. The audio bandwidth of the
COMMANDER
G
3
in
Music
mode is 15 kHz. This can be achieved with bit
rates of 24,000 bps or higher and a delay of only 70 milliseconds. The music
algorithm is effective at connection bitrates over 16,800. If your connection
bit rate is lower than 16,800 bps we recommend you use the
Voice G3
algorithm. For more information on connection bitrates, please see the
section in this manual titled Overview of the Manual Default Profiles.
24.10.2.
Tieline Music Plus
T
ieline
Music Plus
offers 20kHz mono from 48kbps upwards. It can also
deliver 15-20kHz stereo from 64kbps upwards.
24.10.3.
G711 (For ISDN use)
The
G.711
algorithm is an international standard telephony encoding format.
It is a 64 kbps PCM voice-coding technique for digital voice delivery via a
public phone network or PBXs. Bandwidth for this algorithm is 3 kHz. If you
use a POTS line to dial an ISDN line that is connected to your codec, the
codec will select the G.711 algorithm to connect. This will occur automatically
