User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 4: BTS Integration
Page 4-3
 2005, ADC Telecommunications, Inc.
2.1.2 BIM Input
High Power duplexed interfaces requires the use of the High Power Attenuator and the BIM
Module. A block diagram of the forward path balancing components is shown in Figure 4-2.
• Composite Input Power – Sum of all carriers, no more than 47 dBm
• PA Output Power – Tenant MIB value used to measure Output of PA
• RAN Output Power – PA Output Power Minus 2dB diplexer/cable loss
• RUC Attn Offset – Tenant MIB value used to adjust PA output power to account for
variations in RF chain
• BIM Attn Offset – MIB value used to adjust for lower input levels
PA
RAN
PA
Output
Power
RUC
Attn
RAN
Output
Power
Output
Loss
Hub
20 dB
HP pad
Composite
Input
Power
RUC
Attn
Offset
BIM
BIM
At tn
BIM
At tn
Offset
BIM
Input
Power
PA
RAN
PA
Output
Power
RUC
Attn
RAN
Output
Power
Output
Loss
Hub
20 dB
HP pad
Composite
Input
Power
RUC
Attn
Offset
BIM
BIM
At tn
BIM
At tn
Offset
BIM
Input
Power
Figure 4-2. BIM Forward Balance
Table 4-2 shows the recommended power levels and gains for the various CXD bands when
interfaced to the 20 dB Attenuator and the BIM.
Table 4-2. Recommended Forward Balance
BAND COMPOSITE
INPUT LEVEL
PA OUTPUT
POWER
RAN OUTPUT
POWER
FORWARD GAIN
SMR-A 44 dBm +37 dBm +35 dBm -9 dB
SMR-B 44 dBm +37 dBm +35 dBm -9 dB
Cellular 47 dBm +40dBm +38 dBm -9 dB
PCS 47 dBm +43 dBm +41 dBm -6 dB