Ericsson LBI-39224 - Manual (Page 127)

LBI-39224
3-97
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
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
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
NOTE
CAUTION
CAUTION