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The T est T elephone 290 has been designed to meet 886301, 886305,
886317, 882011 and comply with British Telecom specification 81600.
Loop Disconnect Signalling
10pps ±1pps
break 67ms +5, -4%
break/make ratio 2:1
lnterdigit pause 800ms
Pre-digit pause 800ms
DTMF Signalling
Frequency error ± 1 % max
level (both tones) -13 to -9dBm
Pre-emphasis on high tone +2dBM ±1dB
SPECIFICATIONS
Monitor Impedance
Microphone Type
Receiver Type
Weight
>20K ohms
electret
rocking armature
420 grammes
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