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LBI-39224
3-160
Line Type
Select 2-wire (simplex) or 4-wire (duplex) line interfacing by
selecting the respective option button within this group. Selection
must match the line connection requirements to/from the
conventional base station for the currently selected channel.
Default is 4-wire.
Coupling
Select Tx/Rx Coupled or No Coupling by selecting the respective
option button. If coupling is selected, a conventional channel
control command which changes the base station's transmit
frequency will also change its receive frequency and vice-versa.
Default is Tx/Rx Coupled.
For the C3 Maestro for Windows NT console, always select
"Tx/Rx Coupled."
VOX/COR
Select either VOX (voice activated) or COR (carrier operated
relay) receive activation by selecting the respective option button.
If VOX activation is selected, conventional channel-originated
calls on the currently selected conventional channel are detected by
the CEC/IMC (calls "trip") when the channel's line audio exceeds
the VOX threshold point specified by VOX Thres (see following
text). If COR activation is selected, conventional channel-
originated calls on the currently selected conventional channel are
detected by the CEC/IMC based upon E-lead status at the CI
Board. Default is VOX.
VOX Thres (VOX Threshold)
This level setting, in dBm, establishes the turn-on or trip-point for
VOX activation. The set level is only valid if the VOX option
button is selected (see previous text). The turn-off or un-trip point
is approximately 4 dB lower than the turn-on point. Each VOX
circuit in a CI Board (one per channel) has a fast attack time and a
long decay time. This provides rapid CEC/IMC channel
assignment for a conventional call and it prevents turn-off (VOX
un-trip) between spoken words during a call. VOX Threshold
range = -37 dBm – -3 dBm, default = -34 dBm.
NOTE