ZETRON 4000 Series, Installation Manual

Page: 51 / 418

51
Configuring Channel Cards
operation. Switching between COR and VOX operation is a software configuration item.
See
Tone/Local Software Configuration
on page 54.
There is also an Enhanced Call Detection mode available that provides a more precise call
detection method, provided certain requirements are met. For more information, see
Enhanced Call Detection Mode
on page 62.
Busy Transmit Inhibit
Each channel may be configured to allow or inhibit transmission on a “Busy” channel (see
Table 15 ). A channel is “Busy” whenever its cross-busy-input (X-Busy In) is activated by
a locally paralleled control point, or when its line-operated-transmit-lamp (LOTL) is
activated by a remotely paralleled control point. Usually, inhibiting while busy is desired
to prevent confused communications and to keep proper line terminations and levels.
However, when line conditions cause falsing of the LOTL, it is desirable to be able to
transmit even while busy.
Table 15: Dual Channel Card, Busy Transmit Inhibit Switch
Duplex
Each channel may be configured for full duplex or simplex operation (see Table 16 ). Full
duplex operation requires a 4-wire system and allows the dispatcher to transmit and
receive simultaneously (like a telephone). Simplex (or half-duplex) operation may either
be a 2- or 4-wire system, and allows the dispatcher to transmit or receive but not both
simultaneously. This switch-selectable option prevents dispatchers in full duplex operation
from hearing themselves, and thus prevents feedback. Each DCC has the same option.
Note Only one console within the CCE may transmit on a channel at a
time. Each Dual Channel Card has the same option.
Channel A
Busy Transmit Switch Position
Busy Transmit Inhibit “BTI” (switch 5) On
Busy Transmit OK “BTI” (switch 5) Off*
Channel B
Busy Transmit Switch Position
Busy Transmit Inhibit “BTI” (switch 1) On
Busy Transmit OK “BTI” (switch 1) Off*
* factory default