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TELEPHONE INTERFACE REQUIREMENTS FORM
October 20001
The Telex TIF 2000 Digital Hybrid Telephone Line Interface has been designed to respond to ringing for auto-answer and to
respond to a number of conditions to detect hang-up. These conditions are (in the standard product) based upon the telephone
systems of the US and other select countries. PBX (private branch exchange) systems in the US and other countries may have
ringing and hang-up characteristics which differ from the design parameters used in the TIF 2000. Public telehone systems in
countries other than those currently supported by Telex may have ringing and hang-up characteristics which differ from the
design parameters used in the TIF 2000. Additionally, some countries require governmental approval for connection of the
TIF 2000 to the public telephone system. Telex handles these requirements on a case by case basis and may require a one-
time engineering fee to adapt the TIF 2000 for a specific telephone system or to obtain governmental approval. Additionally,
Telex may require the customer to initiate the government approval process of the TIF 2000 for their particular telephone
system.
Here is a form which can be used to obtain the required specific technical information.
Termination impedance matching (off-hook):_______________________
Termination impedance matching (on-hook):_______________________
Protection devices required:____________________________________
Return loss:__________dBm
Maximum allowable transmit level:____________dBm
Hi-pot tests: Tip to ring:________________________
Tip to ground:_____________________
Ring to ground:____________________
Ring Signal: frequency:______Hz cadence:_______sec. on _______sec. off
Disconnect Signal:
loop drop:
Y____ N____
loop reversal: Y____ N____
audio signal: Y____ N____
If Y, frequency of tone(s):_________________
cadence:_______sec. on _______sec. off
DTMF dialing: frequencies:_____________________________________________
duration:_________msec.
interdigit pause:__________msec.
Pulse dialing: pulse rate:__________Hz
break-to-make ratio_____:_____
Hook flash break duration:______msec. min. ________msec. max.