Telos ZephyrExpress - Manual (Page 24)

1-12 QUICK RESULTS
Now tap the EDIT knob toward the panel. The display will change to look like this:
Using the numeric keypad, enter the local number — usually without an area code — for
line 2 of this ISDN circuit. You want to enter line 2, because you’ll be calling it from line
1.
If you’ve placed a manually-dialed call since turning ZephyrExpress on, that number will
already be entered. You can erase it, or delete any number you enter by mistake, by
turning the
EDIT knob counter-clockwise.
When the number is completely entered, tap the EDIT knob toward the panel. This
confirms the number. The Go! box will now turn dark:
Tap the Edit knob to place the call.
In a few seconds, ZephyrExpress will beep twice to indicate the connection has been
made. The two red
LOCK lights towards the lower left of the display screen will light: if
they don’t, verify that the status screen shows Transmit L3-DUAL and Receive L3-STEREO
(see page 1-9).
Talk into the microphone. You should see the signal, slightly delayed, on both lower
volume meters. Turn up the
MONITOR 2 RECEIVE volume until you hear the mic in the
headphone.
?
CURIOSITY NOTE
While the signal you’re hearing sounds almost as good as if the mic were
connected directly to the headphones, you’re actually listening to it after it’s
gone to the phone company’s central office and been sent back to you. Both
digital signals — sending and receiving — are multiplexed on the same copper
ISDN pair.
But the delay you’re hearing is not because of the round trip. It’s a result of the
computer processing necessary to squeeze a high-fidelity signal into a very small
amount of digital data.
ZephyrExpress includes features to minimize the effect of this delay during live
broadcasts. These include low-delay modes for less critical signals and flexible
monitoring to let talent hear their voices locally while receiving music and cues from the
distant studio. You’ll learn how to use these features later in this manual.