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Switch 7:
S7 off:
S7 on:
If the modem is used in the convertor configuration (see switch 7) the following switches are
used to determine the call control procedure:
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Switch 11:
S11 off:
S11 on:
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Switches 9 and 10: select if modem or MLU generates the V.25 answer and calling tones.
S10 off:
S9 off:
S9 on:
S10 on:
S9
S10
MEANING
off
off
modem generates calling and answering tones
no tone generation by MLU
on
off
modem generates answering tone but does not generate calling tone
calling tone generation by MLU
off
on
not valid
on
on
no tone generation by modem
MLU generates calling and answering tones
Table B-3 V.25 tone generation options.
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Switch 6:
S6 off:
S6 on:
-
Switch 12:
select the convertor or the leased line mode of the MLU-circuit.
This switch must be set the same for all circuits on the MLU: all
modems on the MLU are used as leased line or as convertor. Mixed
modem-use on one MLU (convertor and leased line) is not possible.
modem used as convertor configuration.
modem used in leased line configuration.
select if CT106 or CT109 must be used as answer signal.
CT106 or CT109 are not used as answer signals.
CT106 or CT109 are used as answer signals.
modem generates the answering tone itself; switch 9 determines if
the MLU or the modem generates the calling tone.
modem also generates the calling tone itself; the MLU does not have
to generate any tone.
modem does not generate the calling tone; the MLU must generate
calling tone.
modem does not generate any tone itself; the MLU must generate
answering tone and calling tone; S9 must be on !
select which frequency is used as answering tone.
MLU sends answering tone 2100 Hz.
MLU sends answering tone 2225 Hz.
select the normal or the delayed CT108 operation.
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