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Tone/Inter-D igit Dur ati on
Conditions
Only one station is allowed to wait for the tone detector to become available.
When the tone detector is currently assigned to a station, the maximum allowed time
to wait for CO dial tone is 6 seconds (default).
If no CO dial tone is detected within 6 seconds, the tone detector will be returned to
idle, or assigned to another waiting station. The number entered will then be dialed.
In the unlikely event that more than one station requests a tone detector at exactly
the same moment, those stations will hear internal busy tone immediately, although
a tone detector may be available.
Tone/Inter-Digit Duration
Description
Depending on the type ofCO, and the customer specialized dialing requirements, the
TONE TIME and INTER-DIGIT time may be modified for manually-dialed or system
automatically-dialed digits. Typically, no modification of tone/inter-digit duration is
required. However, in some installations where line conditions are poor, tone duration
and/or inter-digit duration timing may be increased to offset poor conditions. Tone
duration and inter-digit duration may be assigned any value (50 to 150 ms).
Programming
Timing can be adjusted such that dialing automatically emulates slow, methodical
depressions of the dial pad keys. Note: increasing the digit duration and inter-digit time
may also be desirable for applications where the user must dial into an off-site voice mail
system or other dial pad key operated device that does not respond well to faster dialing
modes. There are two Dialing Ratio parameters that may be programmed; TONE TIME
and INT_DGT TIME. Tone Time is the actual duration of DTMF tone that the system will
send for each dial pad key pressed while connected to a CO line. Int_Dgt Time is the
minimum actual time between DTMF digits that the system will wait before sending the
next dialed digit DTMF tone.
Default
The
DHS-L
range is from 400 - 800 msec.
Conditions
A longer tone duration or inter-digit duration time will cause a slower output of
manual or automatic system-dialed numbers.
A longer DTMF ON time and/or inter-digit tone time can be used to ensure more
reliable interaction with remote voice mail and similar remote DTMF dial pad
actuated devices.
Users may experience a delayed DTMF confirmation tone if the tone/inter-digit
duration is lengthened.
TONE TIME = 90 msec) and INT_DGT TIME = 800 msec, and the adjustable
Chapt er 3 - Key Station Features, Opera tion, and Programming
3-131
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