The sophisticated state-of-the-art approach to customers' premises and exchange testing.
The Test Telephone for use in all operating conditions. This robust and reliable equipment was designed to meet British Telecom requirements and is available commercially.
Representing the latest advances in analogue telephone test equipment, including a 10-number memory store, the 290 offers two modes of operation and TX with built-in Ringer for call indication.
The 290 is the ideal answer for engineers who work in exchanges, and or at customers' premises.
Modes of operation Monitor and TX
6x3 format, digits 1-0,*#, mem store, mem recall, earth recall, time break recall, mic mute
10pps(+/-), break/make ration 2:1,IDP = 800ms
Tone "on" 100ms min, "off" 100ms min, level (both tones). -11 to -9 dBm pre-emphasis on high tone + 2dBm +/- 1dBm
Pulse/DTMF = 100 ms
20 k ohms minimum
Gives "A-B" pair true break (metallic contact)
The 290 Test Telephone meets the following standards: