Ericsson LBI-39224 manual Alc

LBI-39224

NOTE

In earlier CEC/IMC firmware/software releases, slot allocations could only be made contiguously starting with channel one (1). In some systems this produced slot allocation inefficiencies – some slots had to be allocated but were never used. CEC/IMC software/firmware release 5.0 (and later) provides non-contiguous slot allocations. In this release, only those slots actually required need be allocated. For example, channels 1 and 4 can be allocated slots without allocating slots to channels 2 and 3.

Notch Filter

CAUTION

DO NOT enable the 2175 Hz notch filter for any channel if the respective Audio Board part number is 19D903302P1 (any revision).

Each Audio Board channel is equipped with a 2175 Hz notch filter circuit which when enabled eliminates destructive interference of the channel's 2175 Hz transmit keying tone. In some cases, this destructive interference or "talk down" can cause incorrect (early) trunked site channel drops. To enable the selected channel's notch filter, enter "YES" in the Notch Filter text box. Notch Filter default = "NO" (disabled).

A channel's 2175 Hz transmit keying tone level is established via the Secure Tone setting. Refer to the Secure Tone text box description above for details.

ALC

CAUTION

DO NOT enable ALC for any channel if the respective Audio Board part number is 19D903302P1 (any revision).

Automatic Level Control (ALC) provides compensation for signal level variances in a channel line input signal. As required, enable ALC for

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