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USER-A
DIGITAL CONNECTION
DTE-A
TA-A
CT108
SETUP
SETUP
CONNECT
CT105
CT109
Figure C-5 Call Phase Diagram for an Outgoing Call.
DTE-A dials the convertor group DNR using for example Hayes commands.
The SOPHO-LAM automatically answers the call, and activates CT107. Now MODEM-A
detects that the `terminal' is present (CT108.2 mode). After synchronisation the active
condition of CT105 from DTE-A is signalled to CT109 of the SOPHO-LAM via a frame bit.
CT109 is connected to CT105 of MODEM-A.
MODEM-A receives an active signal at CT105 an goes off hook. Now DTE-A has a transparent
connection with the MODEM-A. Note that MODEM-A in figure
Diagram for an Outgoing Call.
106
CONVERTOR ANALOGUE CONNECTION
ISPBX
SOPHO-LAM
INC. CALL
ANSWER
SYNCHRONISATION
VIA FRAME BIT
VIA FRAME BIT
operates in the CT108.2 mode. Otherwise MODEM-A would
MODEM-A
ISPBX
CT107
OFF HOOK
when modem
CT108
operates in
CT108.1
mode
CT109
CT105
OFF HOOK
CT108.2
mode
ANSWER
CT108
CT107
CARRIER
CT105
CT109
USER-B
MODEM-B
DTE-B
RINGING
CT125
CT108
ANSWER
CT107
CT105
CT109
Figure C-5 Call Phase
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