ADC 75-192 - Manual (Page 59)

ADCP-75-192 • Issue 2 • June 2007
Page 47
© 2007, ADC Telecommunications, Inc.
The BIM input balancing procedure is as follows:
1. Insert signals into the HP Attenuator at the recommended input level (composite).
2. If the input level is lower than the recommended value, adjust the
transceptTenantMoreAttenTable.transceptTenantBimForwardAttenZOffset fields in the
Tenant OAM MIB by a comparable amount.
The BIM input balancing procedure is as follows:
1. Insert signals into the HP Attenuator at the recommended input level (composite).
2. If the input level is lower than the recommended value, adjust the
transceptTenantMoreAttenTable.transceptTenantBimForwardAttenZOffset fields in the
Tenant OAM MIB by a comparable amount.
For example: If the PCS composite input is 44 dBm, enter a -30 into the transceptTenantMore-
AttenTable.transceptTenantBimForwardAttenZOffset field.
3. Using the transceptTenantCalTable.transceptTenantRanYOutputPower fields of the
Tenant OAM MIB, examine the PA output power for each RAN in the simulcast
4. Using the transceptTenantGenTwoTable. transceptTenantRucYAttenOffset field in the
Tenant OAM MIB, adjust the RUC attenuator to perform final adjustments with all
carriers present.
3.9.3 Reverse Path Balancing
The reverse gain indicates how much gain the Digivance CXD will give to a reverse path signal
before presenting it to the base station (e.g. a –100 dBm signal at the RAN input will be –90 at
the input to the BTS when Reverse Gain is set to 10 dB). The reverse gain settings are shown in
Table 10 .
Use the following procedure to balance the reverse path:
1. Measure or calculate cable loss from BIM Output to BTS input
2. Enter cable loss value (forward and reverse) into the transceptTenantForwardCableLoss
and transceptTenantReverseCable Loss fields of the Tenant OAM MIB field for this
Tenant Sector
Note: For example: If the PCS composite input is 44 dBm, enter a -30 into the
transceptTenantMoreAttenTable.transceptTenantBimForwardAttenZOffset field.
Table 10. Reverse Gain Settings
REVERSE
GAIN (DB)
COMMENT
+10 Normal setting, for dedicated BTS sector
0 Shared BTS tower sector, 3dB impact on BTS tower coverage
-10 Shared BTS tower sector, no impact on BTS tower coverage, 3dB impact
on Digivance CXD/NXD coverage