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USER-A
DIGITAL CONNECTION
DTE-A
TA-A
INC. CALL
CT125
CT108
ANSWER
CT105
CT109
Figure C-4 Call Phase Diagram for an Incoming Call.
• Call request to SOPHO-LAM
The call request and clearing operation of the SOPHO-LAM convertor depends on the
data parameter settings. Normally the SOPHO-LAM receives a call request via CT125 of
MODEM-A. But there are also other possibilities. For example, one of the following data
parameters settings can be used:
-
CT105 initiates call request;
-
CT103 initiates call request;
-
CT108 initiates call request.
When CT105 is used as call request, the carrier of MODEM-B initiates a call request via
CT109 (DCD) of MODEM-A. In this case the connection between DTE-A and the
SOPHO-LAM convertor is cleared when the line connection is out of synchronisation.
104
CONVERTOR ANALOGUE CONNECTION
ISPBX
SOPHO-LAM
Call request
SETUP
when using
hot line or
PDD
SETUP
CONNECT
SYNCHRONISATION
VIA FRAME BIT
VIA FRAME BIT
MODEM-A
ISPBX
RINGING
CT141
CT125
CT107
CT108
ANSWER
CT108
CT107
CARRIER
CT105
CT109
CT109
CT105
CARRIER
CT105
CT109
USER-B
MODEM-B
DTE-B
CT108
OFF HOOK
CT105
ANSWER
CT107
CT109
CT109
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