Chapter 8: Electrical Specifications
AC Power Input
Voltage
TLS-4A: 115 VAC ±15%
Frequency 49 to 61 Hz
Current TLS-4A: 0.2 A maximum (nominal line voltage)
Fusing 0.25 A 5 x 20 mm slow blow
Unit dissipation 20 Watts maximum
Telephone Line Circuit (Loop Start)
On-hook voltage
-48 ± 5 Volts (Tip positive referenced to Ring)
Short circuit loop current < 30 milliamps
Minimum loop current 18 milliamps with a 500-ohm loop
Transmission Specifications
Nominal impedance 900 ohms
Insertion loss
Switchable between 3.4 dB and 16 dB ± 2 dB @ 1 kHz
when two lines are connected
Ring Source
Ring voltage
78 VAC ± 10% AC @ 20 HZ sinewave
Ring frequency
Selectable 20, 25, 30, 60 ± 5% Hz
Drive capacity Up to 5 ringer equivalents (5 REN) total @ 20 HZ
sinewave
Ring termination on answer Within 250 ms
Ring waveform Selectable step approximated sine or square wave
DTMF Detection
Frequency accept
± (1.5% + 2 Hz)
Frequency reject
± 3.5%
Tone-on time 40 ms minimum
Tone-off time 40 ms minimum
Amplitude +4 to -18 dBm per frequency
Twist 6 dB or less
Rotary Dialing Detection
Rate 8 to 22 PPS
Percent break range 40% to 80% (LSSGR 6.3.4.6)
Break time 18 ms minimum, 100 ms maximum
Make time 9 ms minimum, 75 ms maximum
Interdigit time 300 ms minimum
End-of-digit detection 100 ms minimum
Loop Current Detect
Minimum off-hook current 15 mA
Maximum on-hook current 10 mA
Off-hook detect time 100 ms max
On-hook detect time >Flash
Hook flash detect time 300 - 1100 ms (must detect)
<280 ms > 1120 must not detect
Telephone Line Simulator 4A
Page 44
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