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040 7448 329657 (04.97) PC-SW 4.5
C H A P T E R 3 : O P E R A T I O N W I T H A P C
3.3.8.2
SIGNALLING
3.3.8.3
AUTO ANSWER
With the AUTO ANSWER switch, it is possible to answer incoming calls auto-
matically. To do this, put the switch in the ON position. This is the usual setting.
To prevent calls from coming in, set the switch to OFF.
3.3.8.4
LINE MODE
LINE MODE has three different modes which are explained in the following.
This selection is only to be made for the RS449 and the X.21 interface and
has no effect on the E1/T1 interface.
3.3.8.5
CLOCK SOURCE
Three different clock sources can be selected for the line interfaces:
Setting
Meaning
H.244 (auto)
Automatic selection of the signalling procedure H.221 or ISO/IEC CD 13871
H.242 (bidir.)
The complete inband signalling procedure is carried out including capability ex-
change as per H.242. This setting should always be selected if a bidirectional
channel is available (H. 221 signalling in each channel).
H.331 (unidir.)
Limited inband signalling procedure, no capability exchange takes place, only
commands are transmitted to the far end. There is no check whether the far end
can communicate with the codec. This setting must be selected if only one uni-
directional channel is present. It should also be ensured that the procedure is
implemented in the far end terminal.
ISO/IEC 13871
Selection of the signalling procedure as per ISO/IEC CD 13871, connections
can only be set up with equipment that supports this procedure.
Setting
Meaning
n
∗
56 kbit/s
a
a
Available from SW-Version 4.0
Provides n
×
56 kbit/s at the selected interface.
b
b
The dialling must be initiated from the terminal adapter
n
∗
64 kbit/s
(UNRESTRICTED)
Provides n
×
64 kbit/s at the selected interface.
n
∗
64 kbit/s
(RESTRICTED)
a
Provides n
×
64 kbit/s at the selected interface, however with a net data
rate of 56 kbit/s. Every eighth bit is set to one. This mode can only be used
if the codec provided with octet timing at the X.21 interface.
Setting
Meaning
INTERNAL
The internally generated clock is used.
EXTERNAL
An external clock is used
a
.
a
Accuracy:
±
50 ppm for E1/T1,
±
1% for RS449 and X.21
RECOVERED
b
b
only for E1/T1 network interface
The clock recovered from the receive signal is used.
Содержание Titan
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