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go off hook after receiving an active CT108.
After the connection between DTE-A and the SOPHO-LAM is established, DTE-A can dial the
number of DTE-B using one of the dial options of MODEM-A, for example Hayes commands.
MODEM-B detects an incoming call and activates CT125. In return DTE-B activates CT108
and MODEM-B answeres the call. Now MODEM-B activates CT107 and DTE-B in return
activates CT105, after which the carrier is transmitted to MODEM-A. After the carriers are
present, both modems activate CT109. The active CT109 of MODEM-A is signalled to TA-A
(via the Proprietary protocol, V.110 or X.30), after which TA-A also activates CT109.
After these interactions there is a transparent connection between DTE-A and DTE-B.
C.4.3. Call Clearing from the ISPBX side
Figure
Figure C-6 Call Phase Diagram for Call Clearing from ISPBX side.
diagram for clearing a call from the ISPBX side.
USER-A
DIGITAL CONNECTION
DTE-A
TA-A
CT108
OFF
ON HOOK
ON HOOK
Figure C-6 Call Phase Diagram for Call Clearing from ISPBX side.
CONVERTOR ANALOGUE CONNECTION
ISPBX
SOPHO-LAM
CLEAR
CT109
CT105
CT107
CT108
CT108
CT107
ON HOOK
OFF
OFF
MODEM-A
ISPBX
ON HOOK
NO SYNC.
ON HOOK
shows the call phase
USER-B
MODEM-B
DTE-B
CT109
OFF
CT107
OFF
CT108
OFF
107
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