Service Module Downlink Agc; Transport Module Agc - ZinWave UNITIVITY 5000 User Manual

UNItivity 5000 Initial System Setup
User Manual
Calculated Input Level (dBm) corresponds to the RF level on the fiber, which is recommended to be
set to -25dBm.
Separately, the relative mix of power levels from each service input is specified by the Calculated
Relative Power Level. The dominant input is set to 0dB, and the lesser inputs are set to a negative dB
value. This determines the mix of signal levels appearing at the Remote Unit outputs.
The system uses these input parameters together with the desired DL Power required from each RU
to configure the gains of each path in the downlink. It also configures the uplink gain, following from the
downlink gain and the desired UL/DL Balance.
In this section, configure the label for the Primary Hub and the Services, enable or disable Service
Modules (and Transport Modules). The Relative Input AGC Threshold is described below, where
excessive input levels are managed. The RF Matrix has 4 inputs from each of the service modules,
connected to 4 outputs via 16 independent switches. The 4 outputs feed consecutive pairs of the 8
Optical Modules on the front of the Hub, such that the Services may be flexibly routed to some or all of
the Remote Units.
Note that composite RF input into a Service Module should not exceed +15dBm.
Individual Optical Modules and Transport Modules in the front slots of the Primary Hub can be directly
disabled by clicking the green icon next to the port. A Module can be re-enabled by clicking the red icon
next to the port. Enabling or disabling the Module is applied immediately the relevant icon is clicked
(resulting in the System Status page opening.) There is no requirement to click "Validate Settings" and
"Apply Settings" to enable or disable an Optical Module or Transport Module in a front slot.
10.3.3

Service Module Downlink AGC

An AGC function is implemented for the Downlink of each Service Module, to protect the DAS system
from overload due to excessive input signal levels.
From the version 5.07 software release, the installer is able to independently configure an Input AGC
Threshold for each installed Service Module. This is done by adjusting the 'Relative Input AGC
Threshold' settings within the Primary Hub Configuration section of the System Setup screen.
The value specified for each Service Module is relative to the Calculated (maximum) Input Level
specified for that Service Module. If a maximum Input Level of 0 dBm is configured, and the Relative
Input AGC Threshold is set to +3 dB, then the Primary Hub will limit the downlink signal level internal
to the Service Module to +3 dBm by dynamically dialing in additional attenuation in the Service Module
as required. Such signal limiting will occur until the available attenuation in the Service Module is
exhausted, or the input signal applied to the Service Module achieves the maximum permitted level of
15dBm, at which point the service input will be disabled and a loss of service alarm will be raised. Note
that the Service Module AGC function incorporates limited hysteresis to avoid excessive AGC cycling.
10.3.4

Transport Module AGC

Similar to a Service Module, an AGC function is implemented for the Downlink of each Transport
Module, to protect the DAS system from overload due to excessive input signal levels. This is done by
adjusting the 'Relative Input AGC Threshold' setting within the Primary Hub Configuration section of
the System Setup screen.
The value specified for each Transport Module is relative to the Calculated (maximum) Input Level
specified for that Service Module. If a maximum Input Level of -25 dBm is configured, and the Relative
Input AGC Threshold is set to +5 dB, then the Primary Hub will limit the downlink signal level internal
to the Transport Module to -20 dBm by dynamically dialing in additional attenuation in the Transport
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