9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-7-23
Caution: On CCDP XPIC links ATPC must be OFF on both links to avoid
abnormal ATPC operation. (ATPC operation is driven by its remote-end RSSI/
RSL, which for co-channel links is modified by the interference caused on one
link by the other).
Table 7-5. ATPC Functions and Descriptions
3 Set maximum local end Tx power
4 Set minimum local end Tx power
5 Detected local end Tx power
6 Mouse-over for tooltip advice
Item Description
For co-channel XPIC links do not use ATPC.
Where a link license specifies a maximum Tx power, the maximum Tx power
setting for ATPC must be set no higher than the licensed maximum.
Function Description
Target Remote Fade Margin This is the desired fade margin for the remote-end RAC/ODU, or Radio/ODU.
Depending on the path design this should be set at a level which will allow
head room for the local Tx power, while ensuring an adequate fade margin.
Remote Fade Margin This is the calculated fade margin for the remote end. The remote radio
transmits its current RSL and SNR to the local end once every 100 ms. The
local radio then determines a fade margin by offsetting these RSL and SNR
values from the calculated 10
-6
receive threshold level for the modulation and
bandwidth option selected. If the RSL and SNR values satisfy the Target Fade
Margin range, then the ATPC algorithm does not adjust the local Tx power (a
small tolerance prevents unnecessary small fluctuations in power). If the RSL
and/or SNR values are too low then the local Tx power is increased until the
Target Fade Margin is achieved, or until the maximum Tx power setting is
reached, whichever occurs first. Similarly, if the RSL and/or SNR values are
too high, then the local Tx power is decreased until the target fade margin is
achieved, or until the minimum Tx power setting is reached, whichever occurs
first. Under normal operating conditions the Target Remote Fade Margin and
the Remote Fade Margin should indicate within 2 dB of each other.
Note: 9500 MXC compensates for fades of up to 6 dB per second.
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