Ericsson LBI-39224 manual Coupling, Vox/Cor, 160

LBI-39224

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.

NOTE

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.

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