2N Helios - 1.4 Terms and Symbols Used; Terminology

Terms and Symbols Used
1.4
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1.4 Terms and Symbols Used
Terminology
 Line pick-up/seizure/off-hook
call start, line locked, busy.
 Line hang-up/clear
call end, handset hang-up.
 DTMF
dual tone multi-frequency signalling.
 PSTN
public switched telephone network.
 Outgoing call
-telephone connection made, e.g. by a pressing a button.
 Incoming call
telephone- connection.
 Programming mode
 programming mode accessible from by dialling into the
intercom only.
 Code lock
mode for entering the password for switch 1 or 2 activation using a
numerical keypad.
 Telephone mode
you can make a call, dial a number and hang up using the numerical
keypad.
 DTMF transmission during call
for outgoing calls only, numbers are tone-dialled by a numerical keypad
button.
 Button substitution
the numerical keypad can be used instead of a number pre-stored under a
button memory.