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B.6.
STANDARD SIGNALLING GROUPS
A number of standard signalling groups are available where the projecting bits and byte are
assigned the correct values for specific operation modes. See diagram
B.6.1. Modem used as Convertor
When the modem is used in the convertor configuration, the most important bit is bit 0 which
determines if the modem is used as convertor or leased line. There are 4 standard signalling
groups available for the MLU with the connected modem functioning as convertor. These 4
signalling groups are specified with the values for the projecting bits.
• 1604
Modem is used as a pool-modem in the convertor configuration for both incoming and
outgoing calls (STF - CT126 switched). The communication speed is fixed to the low
speed of the modem (DSRS - CT111 fixed off).
BIT 0
BIT 1
0
0
don't care
• 1606
Modem is used as a pool-modem in the convertor configuration for both incoming and
outgoing calls (STF - CT126 switched). The communication speed is fixed to the high
speed of the modem (DSRS - CT111 fixed on).
BIT 0
BIT 1
0
0
don't care
• 1608
Modem is used as a pool-modem in the convertor configuration for both incoming and
outgoing calls (STF - CT126 switched). The communication speed is call dependent (DSRS
- CT111 switched). The speed is switched to the high speed if the CV-speed indicates the
communication speed is 1200 bps or higher. The speed is switched to the low speed if the
CV-speed indicates the communication speed is less than 1200 bps.
BIT 0
BIT 1
0
0
don't care
• 160A
Modem is used as a pool-modem in the convertor configuration for both incoming and
outgoing calls (STF - CT126 switched). The communication speed is call dependent (DSRS
88
BIT 2
BIT 3
0
0
BIT 2
BIT 3
0
1
BIT 2
BIT 3
1
0
don't care don't care don't care don't care don't care
BIT 4
BIT 5
0
1
don't care don't care don't care don't care
BIT 4
BIT 5
0
1
don't care don't care don't care don't care
BIT 4
BIT 5
0
1
Figure C-8
.
BIT 6
BYTE 0
0
H`FF'
BIT 6
BYTE 0
0
H`FF'
BIT 6
BYTE 0
0
D`18'
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