NetWave DirectView Broadcast Console Operations & Technical Manual
Revision A
3 - Operation
Harris Broadcast
3-13
PR&E
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ISDN or other telephone codec
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Two-way radio
Each Telco device has a Caller or From Network output that connects to a Telco channel input. A NetWave
mix-minus output, specifically controlled by the settings on that Telco channel, goes from the console back
to the Send or To Network input on the Telco device.
The console’s two local Telco outputs (called “Mix-Minus”) are also known as “fold back” or “IFB”
(Interruptible Fold Back) outputs, since the board operator can independently talk to either output. No
matter which bus is assigned to these mix-minus outputs, the audio is always minus the incoming Telco
audio. On earlier analog consoles, this mix-minus output would be manually created by the board operator
through bus assignments. But on the NetWave console, the mix-minus output is always correctly derived by
the console, regardless of which bus is selected on the Telco channels.
The board operator can talk to either mix-minus output by pressing and holding that Telco channel’s active
On or Off button. The button blinks rapidly while pressed to indicate talkback is active.
Linked NetWave consoles also have dual-channel mix-minus signals that can be routed to any VistaMax
destination or output. One channel is the same IFB mix-minus output as available on the console, while the
second is a clean feed mix-minus output. To use this dual mix-minus output, the console must be linked to a
VistaMax system and the Telco device’s Send or To Network input must be connected to a VistaMax system
output. This type of connection is most often used with dual channel ISDN remotes where the IFB output
goes to the talent headphones at the remote while the clean feed goes to a PA system at the remote
broadcast site.
The Telco channel sources should be identified by custom labels during installation, in lieu of the standard
A/B labels. If they do not have custom labels, Telco channels have one distinctive feature: one bus
assignment button winks or blinks because, on each Telco channel, the bus assignment buttons are
multipurpose; they not only assign the Telco channel to one or more buses, they also set which bus is used
to create the mix-minus return signal. In addition, the buttons also identify whether or not that Telco
channel is being sent to the Telco Record output. It is a bit complicated, but the next sections should help
clarify.
The Telco Mix-Minus Outputs
The mix-minus audio output for each Telco channel is derived from one Program or the Offline bus. Which
bus feeds the mix-minus output is identified on each Telco channel by one winking or blinking bus
assignment button. A winking button (lit, dimmed, lit) indicates three things:
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The Telco input is assigned to that bus.
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The mix-minus output is coming from that bus.
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That bus is also feeding the Telco Record output so that the caller or remote can be recorded.
A blinking button (lit, off, lit) indicates the same three things except that Telco channel is not feeding the
Telco Record output so that caller or remote is not being recorded.
The button that winks or blinks is also determined, in part, by whether the Auto Foldback console feature is
set on or off. This feature is set during console setup. When Auto Foldback is off, which is the console’s
default setting, the Offline bus always has priority. This means that if the Offline button is lit on a Telco
channel, it winks and the mix-minus output for that Telco channel, and for the Telco Record output, is the
Offline bus. To send a PGM bus to the mix-minus output, the Offline button must be turned off. Then the
PGM button blinks, since the Offline bus is feeding Telco Record. When Auto Foldback is off, the Telco
channel on/off status does not affect which bus is going to the mix-minus output or to the Telco Record
output. Use this mode to record callers rather than have them go live to air.
If callers or remotes go live to air, Auto Foldback should be set on. In this mode, when the Telco channel is
off, Offline is automatically fed to the mix-minus output. When the Telco channel is turned on, the mix-
minus output automatically switches to the lowest number Program bus assigned on that Telco channel.
Turning the channel off automatically switches the mix-minus back to the Offline bus.
