6
DHY-03 User Handbook
world via digital lines - in this case there is no network echo and switch 7 should
be turned off.
Receiving a Call
With the equipment connected as in Figure 1-5 calls may be received and detected by the
ringer in the telephone handset. To receive the call, lift the handset and establish contact
with the caller. The call may be diverted to the telephone hybrid by pressing either the
front panel mounted line connect button or by means of the remote connect switch (if
connected).
Note : The DHY-03EC and later DHY-03 units (see page 40) have an integrated divert
relay that will automatically disconnect the handset when the unit handles the calls. For
early DHY-03 units (see page 40), at this point, the telephone handset must be replaced,
otherwise the line will be double terminated resulting in poorer performance. For early
units, order the accessory DHY-03RLY in order to have a divert relay to automatically
disconnect the handset.
Alternatively, the incoming calls can be answered manually from the line connect button or
the remote line connect switch or automatically by enabling the integrated ringing detector
(settings SW4 On). Ringing tone will illuminate the line connect button. The line connect
button lamp is off in the non-connected mode and illuminated in the connected mode.
It is recommended that the auto-disconnect feature be used when the ringing detector
is enabled.
Note : The remote lamp tally mimics the front panel line connect button lamp, i.e.
it flashes when ringing and is on when the line is held.
The hybrid unit will now behave as a 4-wire to 2-wire converter with signal inputs at the
mic/line input connector and telephone signal output at the output connector.
The call may be cleared by re-pressing the line connect button or by means of the remote
divert switch. The call can also be cleared automatically by enabling the auto-disconnect
feature, or via the serial port CLR: command
With both auto-answer and auto-disconnect in use, call handling can be completely
automatic in operation (settings SW3 & SW4 On).
The DHY-03EC has a on-board line connect switch and LED to indicate it’s function.
Normally the line connect function is performed through the remote line connect input.
Integrated Ringing Detector – Auto Answer
Ringing detectors can be used when you need to answer a call automatically, for instance,
if a journalist files a report to a tape recorder over a telephone line, the call can be picked up
after a set number of rings by the ringing detector. The DHY-03 has a built in ring detector
that is enabled by setting SW4 on the rear panel.
Making a Call
To initiate a call, lift the handset and dial the required telephone number. When the call
has been established, press the line connect button and the call will be handed over to
the telephone hybrid unit. At this point, for early DHY-03 units (see page 40) the telephone
INTR
ODUC
TION
INTRODUCTION
1
