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SOPHO-LAM CONNECTOR
PIN
CIRCUIT
7
CT102
3
CT104
2
CT103
8
CT109
4
CT105
20
CT108
6
CT107
24
CT113
17
CT115
18
CT141
22
CT125
25
CT142
11
CT126
Table C-2 Cable Definition.
CT125 of the SOPHO-LAM is always OFF, also during an incoming call to the SOPHO-LAM.
The reason for this is that CT125 of the modem is used and CT125 of the SOPHO-LAM is
NOT used. For practical reasons the special cable is made symmetric. To prevent that the
Local Loop Back of the modem is activated, CT125 of the SOPHO-LAM is forced to OFF
during all states of the SOPHO-LAM.
The following subsections describe the operation of the SOPHO-LAM convertor in a leased
and switched line configuration.
C.3.
LEASED LINE CONFIGURATION
Figure
Figure C-2 Leased Line Configuration with SOPHO-LAM convertor.
line configuration with SOPHO-LAM convertor.
98
MNEMON
IC
GND
Connected to 7
RCD
Connected to 2
TMD
Connected to 3
DCD
Connected to 4
RTS
Connected to 8
DTR
Connected to 6
DSR
Connected to 20
TSET
Connected to 17
RSET
Connected to 24
LL
Connected to 22
CI
Connected to 18
TI
Connected to 11
STF
Connected to 25
MODEM CONNECTOR
PIN
CIRCUIT
CT102
CT103
CT104
CT105
CT109
CT107
CT108
CT115
CT113
CT125
CT141
CT126
CT142
shows the leased
MNEMON
IC
GND
TMD
RCD
RTS
DCD
DSR
DTR
RSET
TSET
CI
LL
STF
TI
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