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Issue 1 Jan 2006
LKA-200
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5
6.2.3 Frequency Deviation
The accuracy for each of the two fundamental frequencies compare to DTMF
frequency table.
Required result: Less than + 1.5 %
6.2.4 DTMF Signal Duration
Required results:
Signal duration time : More than 65 ms
Inter-digit time : More than 65 ms
6.2.5 DTMF Total Harmonic Distortion
Required result: Less than –20 dB at 20 mA current condition.
6.2.6 Pulse dialing (option)
Required results:
Pulse speed : 10 + 0.8 pulse per second
Make / Break ratio : 40:60 + 3 % for OJ23 (33:66 for OJ12)
Break resistance : More than 200kohm
Interdigit pause : More than 600 ms
6.2.7 Flash time
Required results: 100, 300, 600 ms (depends on flash jumper option).
6.3 DC CHARACTERISTICS
6.3.1 On-hook DC resistance
Required result: More than 5 Mohm at 200 V dc.
6.3.2 Off-hook DC resistance
Required result: Less than 8 V at 20 mA