aci DSIM-SG, Руководство по установке

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DSIM-SG
Installation Guide Rev G
Page 5 of 18
The DSIM-SG modules will be configured at the factory to have the default channel 88 digital
(609.00 MHz) pilot channel programmed. The DSIM controller is used to set the DSIM-SG
modules to the customer selected pilot channel. In the setup of the DSIM-SG module the pilot
channel that is programmed into the controller is downloaded into the memory of the DSIM-SG
module. The pilot channel setting in the DSIM-SG module can be changed in the future by simply
using a controller with the new desired pilot channel programmed.
3. DSIM Mode Definitions
Operation Mode Definition
MGC
In the Manual Gain Control (MGC) mode the DSIM automatic gain
control is turned off.
The MGC mode is used during the setup of the station so that no
gain adjustments are made when the levels and slopes are setup.
AGC
In Automatic Gain Control (AGC) mode will make gain adjustments
to the station based on the level changes that occur on the pilot
channel.
TGC
In Thermal Gain Control (TGC) mode the DSIM will make gain
adjustments based on the changes in the internal temperature of
the station. In the TGC mode there is a selection of 9, 18 or 27 dB
for the amount of cable that is in front of the station. The dB of
cable setting is used to more accurately predict actual losses that
occur in the cable with the changes in the outside temperature.
Note: Thermal control operational mode should not be used in
amplifiers that are pedestal mounted for underground networks.
These units operate on the assumption that cable temperature will
change at the same rate as amplifier temperature, while amplifiers
mounted in pedestals will vary in temperature far greater than the
underground cable temperature.