XE014JS Просмотр технического описания (PDF) - Xecom
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XE014JS Datasheet PDF : 11 Pages
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Application Notes
Dialing:
The public switched telephone network permits tone and
rotary (pulse) dialing. The XE014JS supports both types of
dialing. Tone dialing requires an external signal source to
provide the dialing tones. Rotary dialing is accomplished by
pulsing the OH or Mute line on the XE014JS.
Pulse Dialing: The XE014JS generates dialing pulses through
momentary closures of the switch-hook. Each digit is
represented as a series of pulses, one pulse for a one to ten
pulses for a zero. The pulse rate is ten pulses per second. The
dialing pulses are asymmetrical. An interdigit delay of at least
one hundred milliseconds separates the digits.
Tone Dialing: To tone dial the XE014JS seizes the line, OH
active. For each digit a unique DTMF, Dual Tone Multiple
Frequency, tone pair is placed across T1 and T2. The higher
frequency tone is always of greater magnitude than the lower
frequency tone. Transmit the tones for a minimum of 70
milliseconds, and leave a minimum of 70 milliseconds be-
tween digits.
The table below shows the correct DTMF signal frequencies
for each digit.
Digit
Lower Tone
Upper Tone
1
697
1209
2
697
1336
3
697
1477
4
770
1209
5
770
1336
6
770
1477
7
852
1209
8
852
1336
9
852
1477
0
941
1336
*
941
1209
#
941
1477
Signal Levels: FCC Part 68 Rules set the allowable signal
level in the US for all signals placed on the telephone line
other than live voice. Other countries have similar regula-
tions. Signal levels are measured in dBm. Zero dBm is 1
milliwatt through a 600 ohm load.
Insertion Loss: There is some loss of signal power as the
information signal passes through the XE014JS. This "inser-
tion" loss should be taken into account when placing signals
across T1 and T2 for transmission. The typical insertion loss
of the XE014JS is 2.7 dBm.
XECOM
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XE014JS
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