ADC Digivance CXD, Руководство по эксплуатации

Страница: 41 / 74

ADCP-75-192 • Issue 2 • June 2007
Page 29
© 2007, ADC Telecommunications, Inc.
3.4.4 Setting RAN Measured Forward Gain
transceptTenantOAMTable.transceptTenantRanXMeasuredForwardGain, where X = 1-8
This object is no longer used in the Digivance CXD/NXD system.
3.4.5 Setting FSC Gain
transceptTenantMoreControlsTable.transceptTenantMoreControlsFscOutputGain
and
transceptTenantMoreControlsTable.transceptTenantMoreControlsFscOutputGainOverride
This feature allows the user to adjust FSC output gain outside of the default setting. The FSC
Output Gain value is in tenths of a dB, and represents the amount of loss from full scale entered
digitally in the forward path. For example, if a set of input signals had a peak to average value
higher than 12 dB, an operator may wish to remove 3 dB of gain to allow for the extra peak
power. The
transceptTenantMoreControlsTable.FscOutputGain entry would be set to a value of
-30 in such a case. The default state of FscOutputGainOverride is “disabled”. In its default state
the system counts active FSC channels and governs FSC gain accordingly. To begin using a
desired override value, set FscOutputGainOverride to “enabled”.
3.4.6 Setting RAN Forward Gain Offset
transceptTenantOAMTable.transceptTenantRanForwardGainOffsetX, where X = 1-8
The RAN Forward Gain Offset is a object in the Tenant OAM MIB that allows the target RAN
Gains for this tenant to be adjusted. This effectively allows the cell coverage provided by a
given RAN to be adjusted. There is one RAN Gain offset object in the Tenant OAM MIB for
each RAN in a tenant simulcast group. The valid range of values for these objects is -120 to
+80, which is -12 to +8 dB in 1/10 dB units.
3.4.7 Setting Reverse Gain
transceptTenantOAMTable.transceptTenantReverseGain
The Reverse Gain object in the Tenant OAM MIB allows the Reverse Gain Target to be set.
This value sets the gain for the entire reverse path. The valid range of values for this object is -
100 to +100, which is -10 to +10 dB in 1/10 dB units. The system assumes a 20 dB pad
between the BIM and the BTS. If the 20 dB pad is not used then the +/- 10 dB gain setting maps
to +10 to +30 dB of gain.
Note: It is possible to overdrive the forward path, which will cause the PA to fault and shut
down.