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ADCP-75-192 • Issue 2 • June 2007
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
HUB
COMPOSITE
INPUT
POWER
20 dB HP
PAD
• 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 diplexer/cable loss (2 dB in CXD, 1.5 dB
in NXD)
• 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.
Table 9
shows the recommended power levels and gains for the various CXD/NXD bands when
interfaced to the 20 dB Attenuator and the BIM.
Page 46
© 2007, ADC Telecommunications, Inc.
BIM
BIM
INPUT
POWER
BIM
ATTN
BIM ATTN
OFFSET
Figure 12. BIM Forward Balance
Table 9. Recommended Forward Balance
COMPOSITE
BAND
INPUT LEVEL
SMR-A
44 dBm
SMR-B
44 dBm
*
47 dBm
Cellular
*
47 dBm
PCS
RAN
OUTPUT
POWER
RUC
PA
ATTN
RUC ATTN
OFFSET
PA OUTPUT
POWER
RAN OUTPUT POWER
+37 dBm
+35 dBm (CXD)
+35.5 dBm (NXD)
+37 dBm
+35 dBm (CXD)
+35.5 dBm (NXD)
+40dBm
+38 dBm (CXD)
+38.5 dBm (NXD)
+43 dBm
+41 dBm (CXD)
+41.5 dBm (NXD)
*
Subtract 1 dB when using CDMA signals.
Figure
PA
RAN
OUTPUT
POWER
OUTPUT
LOSS
21944-A
FORWARD
GAIN
-9 dB
-9 dB
-9 dB
-6 dB
12.
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