Filter
Top Products
ADCP-75-192 • Issue 2 • June 2007
Page 46
© 2007, ADC Telecommunications, Inc.
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 12.
Figure 12. BIM Forward Balance
• 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.
* Subtract 1 dB when using CDMA signals.
Table 9. Recommended Forward Balance
BAND
COMPOSITE
INPUT LEVEL
PA OUTPUT
POWER RAN OUTPUT POWER
FORWARD
GAIN
SMR-A 44 dBm +37 dBm +35 dBm (CXD)
+35.5 dBm (NXD)
-9 dB
SMR-B 44 dBm +37 dBm +35 dBm (CXD)
+35.5 dBm (NXD)
-9 dB
Cellular
*
47 dBm +40dBm +38 dBm (CXD)
+38.5 dBm (NXD)
-9 dB
PCS *
47 dBm +43 dBm +41 dBm (CXD)
+41.5 dBm (NXD)
-6 dB
21944-A
BIM
HUB
BIM
ATTN
20 dB HP
PAD
RUC
ATTN
BIM
INPUT
POWER
RAN
OUTPUT
POWER
PA
OUTPUT
POWER
COMPOSITE
INPUT
POWER
BIM ATTN
OFFSET
RUC ATTN
OFFSET
RAN
PA
OUTPUT
LOSS