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TELEPHONE INTERFACE REQUIREMENTS FORM
October 2004
The Telex TIF 4000 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 prod-
uct) 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 4000. Public telephone 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 4000.
Additionally, some countries require governmental approval for connection of the TIF 4000 to the public telephone
system. Telex handles these requirements on a case by case basis and may require a onetime engineering fee to
adapt the TIF 4000 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 4000 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.
Summary of Contents for TIF-4000 Frame
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