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User’s Manual xii
■ Some parameters required for compliance with Telecom’s PTC
Specifications 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, and;
c/ Automatic calls to different numbers shall be not less than 5
seconds apart.
■ Immediately disconnect this equipment should it become physically
damaged, 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 (1800Hz guard tone)
AT&P1 (decadic dialing make-break ratio =33%/67%)
ATS0=0 (disable auto answer)
ATS6=4 (blind dial delay)
ATS7=Less than 90 (time to wait for carrier after dialing)
ATS10=Less than 150 (loss of carrier to hangup delay - the factory
default of 15 is recommended)
ATS11=90 (DTMF dialing on/off duration in milliseconds)
ATX2 (dial tone detect, but not USA call progress detect)
■ When used in Auto Answer mode, the S0 register must be set with to a
value of either 3 or 4. This ensures:
■ 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.
■ 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 normally.