User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 4: BTS Integration
Page 4-4
 2005, 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.
For example: If the PCS composite input is 44 dBm, enter a -30 into the
transceptTenantMoreAttenTable.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.
2.2 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 4-3.
Table 4-3. 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 coverage
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
3. Enter reverse gain setting (-10 to +10 dB, typically +10 dBm) into the
transceptTenantReverseGain field of the Tenant OAM MIB for this Tenant Sector.
Note: The +/- 10 dB reverse gain setting assumes a 20 dB attenuator. Without the
attenuator, the gain is +10 to +30 dB.