Ericsson LBI-39224 manual Prosound Configuration, 203

LBI-39224

2.If only one Clock Board is installed, turn both clocks ("A" and "B") ON using the panel-mounted toggle switches. If multiple Clock Boards are installed, turn OFF all but one "A" clock and turn OFF all but one "B" clock.

3.Clear the MOM Controller Board's non-volatile RAM (NOVRAM). This can be done as follows: Change the MOM Controller Board's DIP switches to a different interface module type (CIM or MIM for example), reset the Controller Board and wait at least three seconds. Change the DIP switches back to the MOM setting and reset the board again.

4.At the CEC/IMC Manager send TDM bus and slot assignments to the CEC/IMC.

5.Reset each Controller Board by pressing the reset switch on the front panel. If the CEC/IMC is equipped with firmware V5.0, this can be done automatically from the CEC/IMC Manager through Activate TDM Bus Slots from the

CEC/IMC Configuration menu.

3.23PROSOUND CONFIGURATION

When roaming on a wide area (multisite) network, ProSound enables a radio to select a new site based upon the bit error rate of the "adjacent" sites' control channels. The roaming operation is referred to as "wide area scan" or "wide area system scan." ProSound ensures the newly selected site's working channels will be sufficient to provide quality audio. During wide area scan operations, EDACS allows up to six adjacent sites to be scanned.

Without ProSound, the decision to wide area scan is based upon the bit error rate of the current control channel; three consecutive bad control messages will cause the radio to wide area scan. The non-ProSound wide area scan algorithm locks onto the first system it detects and validates, but this may not be the best quality signal in the available wide area (multisite) network. This method produces an extended coverage range beyond that of a working channel providing quality receive audio, and the radio operator receives lower quality audio during transition.

ProSound configuration involves sending each trunked site an updated "adjacency" matrix from the CEC/IMC Manager. This matrix is sent to the radio by the site and the radio uses it to make roaming decisions based on the relative bit error rates of the sites in the matrix. The

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