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xii User’s Manual
❑ Some parameters required for compliance with Telecom’s PTC Specifica-
tions are dependent on the equipment (PC) associated with this modem. The
associated equipment shall be set to operate within the following limits for
compliance with Telecom Specifications:
(a) There shall be no more than 10 call attempts to the same number within
any 30 minute period for any single manual call initiation, and
(b) The equipment shall go on-hook for a period of not less than 30 seconds
between the end of one attempt and the beginning of the next.
(c) Automatic calls to different numbers shall be not less than 5 seconds
apart.
❑ Immediately disconnect this equipment should it become physically dam-
aged, and arrange for its disposal or repair.
❑ The correct settings for use with this modem in New Zealand are as follows:
ATB0 (CCITT operation)
AT&G2 (1800 Hz guard tone)
AT&P1 (Decadic dialing make-break ratio = 33%/67%)
ATS0=0 (not auto answer)
ATS10=less than 150 (loss of carrier to hangup delay, factory default of 15
recommended)
ATS11=90 (DTMF dialing on/off duration=90 ms)
ATX2 (Dial tone detect, but not (U.S.A.) call progress detect)
❑ When used in the Auto Answer mode, the S0 register must be set with a
value of 3 or 4. This ensures:
(a) a person calling your modem will hear a short burst of ringing before
the modem answers. This confirms that the call has been successfully
switched through the network.
(b) caller identification information (which occurs between the first and
second ring cadences) is not destroyed.
❑ The preferred method of dialing is to use DTMF tones (ATDT...) as this is
faster and more reliable than pulse (decadic) dialing. If for some reason you
must use decadic dialing, your communications program must be set up to
record numbers using the following translation table as this modem does not
implement the New Zealand “Reverse Dialing” standard.
Number to be dialed: 0 1 2 3 4 5 6 7 8 9
Number to program into computer: 0 9 8 7 6 5 4 3 2 1
Note that where DTMF dialing is used, the numbers should be entered nor-
mally.