EA915X DIGITAL TELEPHONE HYBRID
INSTRUCTIONS FOR USE
EELA AUDIO Het Riet 8A
5431NM CUIJK The Netherlands
Page 6
Dilswitch 2 & 3.
With these dilswitches the behaviour of the automatic control for the minimum hybrid crosstalk is
set. Dependant of the application the best automatic control method can be selected.
DILSW2
DILSW3
CROSSTALK SETTINGS (CANCELLATION)
OFF
OFF
OFF
ON
After switching the hybrid on, the automatic adjustment is active for approx. 2
seconds. After that, the adjustment can be repeated by pressing the UPDATE
switch..
ON
OFF
After switching the hybrid on, the automatic adjustment is continously active.
By pressing the UPDATE switch this adjustment process can be toggled OFF
or ON.
ON
ON
After switching the hybrid on, the adjustment parameters used are those which
are obtained from a previous adjustment procedure and stored in the memory.
By pressing the UPDATE switch, the unit tries to find a new optimum setting;
at releasing the UPDATE switch these new parameters are stored in the
memory.
Making the correct setting.
The most user friendly dilswitch setting is the last one mentioned (DILSW2 =
On & DILSW3 = On), because the digital echo-canceller adjustment doesn't have to be realigned
after the unit is switched on. This has the advantage that the hybrid can be used to go on air
direct, without the need for a producer or operator to have a pre-conversation in which this
adjustment for minimum hybrid crosstalk has to be performed. This method can only be used if
the condition of the lines from the hybrid in the studio to the first (in house) telephone exchange
are the same. This means this can be used with any stationary hybrid in a studio or studio
complex in which above mentioned conditions are the same because the lines used are the same.
If for some reason this method does not give satisfactory results, the dilswitch settings according
the first method then can be used (DILSW2 = Off & DILSW3 = Off).
The hybrid will after it has been switched on during a short time (approx. 20 seconds) adjust itself. In
some cases this adjustment can be found not good enough. The auto-adjustment then can be
activated again by pressing the UPDATE switch for 20 seconds. The hybrid crosstalk (cancellation) will
then be adjusted until a minimum is reached.
Dilswitch 4.
With this dilswitch the behaviour of the EXTERNAL-ON input can be set. In the ON-position the
hybrid can be switched ON remotely by means of a
continuous
closing (loop) contact. In the
OFF-position the hybrid can be toggled On and OFF by a remote
pulse
contact. This EXTERNAL-
ON input can be found on the 25 pin D-type connector marked EXT_ON.
