Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario
Operation and Maintenance Support
will be measured continuously. The temperature level is then used for
update of the RSSI temperature compensation value. The RSSI
compensation value will not be updated more frequently than every
10th second.
update of the RSSI temperature compensation value. The RSSI
compensation value will not be updated more frequently than every
10th second.
38.12
Max Cooling
Purpose
To control the fans to make them perform their maximum available
cooling when certain supervised values have reached certain levels.
cooling when certain supervised values have reached certain levels.
Preconditions and Initiation
Applicable for any operational state. The TMRU (TRU) mode could be
either Local or Remote. The function is initiated by the Internal
Configuration function in the Restart and Recovery sequence.
either Local or Remote. The function is initiated by the Internal
Configuration function in the Restart and Recovery sequence.
Description
After the initiation, the TDMRU (TRU) temperature as well as the
current transmitter maximum output power are continuously supervised.
This supervision is performed for each TDMRU (TRU). Depending on
the supervised values, the general fan speed regulation (see Climate
Protection Functionality) is superimposed by the Max Cooling function.
The Max Cooling function is carried out per cabinet. The Max Cooling
can have the following two states:
current transmitter maximum output power are continuously supervised.
This supervision is performed for each TDMRU (TRU). Depending on
the supervised values, the general fan speed regulation (see Climate
Protection Functionality) is superimposed by the Max Cooling function.
The Max Cooling function is carried out per cabinet. The Max Cooling
can have the following two states:
•
ON = Maximum Cooling
•
OFF = General Fan Speed regulation
Maximum Cooling means that the fans are controlled to perform their
maximum available cooling. General Fan Speed regulation means that
Maximum Cooling is switched off and the fans are controlled by a local
algorithm.
maximum available cooling. General Fan Speed regulation means that
Maximum Cooling is switched off and the fans are controlled by a local
algorithm.
The Maximum Cooling states are calculated from the supervised entities
in the following way:
in the following way:
Max Cooling will have the state ON if at least one of the following
conditions is fulfilled:
conditions is fulfilled:
•
At least one of the supervised TDMRUs (TRUs) has a
temperature that exceeds the critical temperature (CT).
temperature that exceeds the critical temperature (CT).
•
The maximum output power of at least one transmitter is limited
because of overtemperature handling.
because of overtemperature handling.
Max Cooling will have the state OFF if both of the following
conditions are fulfilled:
conditions are fulfilled:
•
All of the supervised TDMRUs (TRUs) have a temperature that is
a constant value lower than the critical temperature (CT).
a constant value lower than the critical temperature (CT).
•
None of the transmitters has its maximum output power limited
because of overtemperature handling.
because of overtemperature handling.
Max Cooling will control the fans in the following cases:
•
At function initiation.
290 (421)
EN/LZT 720 0008
R1A
2001-06-26
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