User Manual

Table Of Contents
Menus and Parameters
Operation and Administration
143
Default value: 5 (dB)
4.2.6.2.8.4 ATPC Parameters in SU
4.2.6.2.8.4.1 ATPC Option
The ATPC Option enables or disables the Automatic Transmit Power Control
(ATPC) algorithm. The parameter takes effect immediately. However, when
changed from Enable to Disable, the transmit power level will remain at the last
Current Transmit Power determined by the ATPC algorithm before it was
disabled. It will change to the value configured for the Initial Transmit Power
parameter only after the next reset or following loss of synchronization.
The default is Enable.
NOTE
The accuracy of the Transmit Power level is typically +/- 1 dB. However, at levels that are 15 dB or
more below the maximum supported by the hardware, the accuracy is +/- 3 dB (for information on
hardware limitations refer to the Country Codes document). At these levels the use of ATPC may
cause significant fluctuations in the power level of the transmitted signal. When operating at such
low levels, it is recommended to disable the ATPC Option and to set the Transmit Power parameter
to the average Tx Power level before the ATPC was disabled.
4.2.6.2.8.5 Tx Control (AU only)
The Tx Control option enables turning Off/On the AU’s transmitter, or having the
AU Tx status controlled by the status of the Ethernet port/link.
If the selected option is Ethernet Status Control, then:
If the Ethernet link is down, the AU transmitter will be switched to Off
If the Ethernet link is up, the AU transmitter will be switched to On.
This feature can be used during maintenance or testing to avoid transmissions
using undesired parameters.
The parameter is available only when managing the unit from its Ethernet port.
The default is On.
4.2.6.2.9 Antenna Gain
The Antenna Gain parameter enables to define the net gain of a detached
antenna. The configured gain should take into account the attenuation of the
cable connecting the antenna to the unit. The Antenna Gain is important
especially in countries where there is a limit on the EIRP allowed for the unit; the
maximum allowed value for the Transmit Power parameters cannot exceed the
value of (EIRP - Antenna Gain), where the EIRP is defined in the selected Sub-
Band.