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DTMF Character Set Tables Explained
The preceding section is somewhat complicated. Therefore, in an effort to
clarify some of the main points, the following explanation is given.
Format. The page begins with a 1.0-second delay, unless it was preceded with
a page. Then the delay is 50mS. When the page is finished, a 1.0-second post
delay occurs. If desired, a DTMF page can consist of several DTMF digits, a
pause, some more digits, a pause, and so on. This allows a series of pages all
contained in one message.
Defaults. Until changed by one of the above codes, the DTMF digit duration is
100mS and the gap between digits is 100mS. Once a DTMF duration change
or a DTMF gap change is made, it remains in effect indefinitely, until changed
by another code. If the user expects to require DTMF pages of varying
durations and gaps, it would be wise to set up the proper DTMF duration
change and DTMF gap change codes at the beginning of each page.
DTMF Custom Changes. DTMF Custom Changes allow the user to choose
durations, gaps, and pauses which are not listed in the various tables above.
These DTMF Custom Changes are found in their own table labeled "DTMF
Custom Changes (Duration • Gap • Pause)" on page 4-30 and are reprinted on
page A-10. The advantages in using codes from the regular tables (not the
DTMF Custom Changes Table) is that such codes require only two keystrokes.
DTMF Custom changes are more flexible, but require four keystrokes. If 00 is
entered for xx, the DTMF custom change will be ignored.
DTMF Pauses. Pauses are additive. Therefore, a series of DTMF Pause
Characters adds to the total DTMF pause. Since the DTMF encoder is shared
with the autopatch, there may be a short delay in either the DTMF page or the
autopatch dialing if both are asked to generate DTMF digits at the same time.
Each DTMF digit is always followed by a DTMF Gap. Therefore, the duration
of a DTMF Gap Change Character adds to the duration of a DTMF Pause
Character when calculating the delay between the last digit of one page and
the first digit of the next page.
Examples
To generate a simple page of the DTMF characters "1, 2, 3, A, B, C" at the
default durations of 100mS and the default DTMF gap of 100mS, you would
enter this:
(PW) 15 9950 01 02 03 10 11 12 *
To send the same characters, but with a duration of 50mS and a gap width of
50mS, you would enter this:
(PW) 15 9950 22 33 01 02 03 10 11 12 *
Messages
4-31
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