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The jumper J8 defines which Clean-Feed bus should be used inside the console for
the particular telco channel being configured. There can only be a maximum of two telco channels in
each mixer because there are only two clean-feed buses available.
If you have one telco module, set this jumper over pins 2 and 3 so that Clean-feed
bus 1 is used. If you have two telco channels, set one module so that J8 is over pins 1 and 2 , and the
other module so that it is over pins 2 and 3.
Jumper J12 should be configured in the same way as J8 to help prevent cross-talk
between the two cleanfeed channels ( Note : Some mixers have not been fitted with this jumper. They
have had a hardware modification made to overcome any possible problems ).
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Each of the channels can be configured so that the timer on the meter bridge is
controlled by the use of the fader. This may be useful for timing the duration of a caller’s
conversation. Set jumper J9 to control the timer with the module fader being configured. Remove
jumper J9 to disable timer control.
When controlled by a channel fader, the timer operates in the following way. When
the fader is opened, if the timer is not already running, it will reset the counter and start the timer. If
the timer is already running when the fader is opened, the counter begins counting but freezes for 3
seconds, so that you can view and note the “start” time. After three seconds the counter will jump to
show the increasing time and will then continue.
The timer will be stopped by a manual stop. The timer can only be reset when in the
Stop mode.
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The PFL function can be cancelled by the fader opening or by using the PFL button
if jumper J11 is set. When Jll is off, the PFL function is not cancelled by the fader open signal.
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Whenever a telco module is installed into a mixer, configuration settings in the
Master Output and Monitor Module have to be altered as well. These are to reduce cross-talk in the
telco module and involve the placement of two jumpers in each of the output boards. Please refer to
Section 5.6.1.3 for further information.