User's Manual

-8-
+9.6dBm
+9.0dBm
-10.4dBm
Directional Coupler 2 (-20dB)
+8.9
dBm
+8.3dBm
-15.1dBm
Directional Coupler 3 (-20dB)
+20.0dBm
BTS
Co-Pilot Beacon (MO Series)
Equipped with Praecis II CDMA
Timing Module
-10.5dBm
+20.0dBm
-0.1dBm
-15.2dBm
-50.2dBm
DAS
RF
Jumper
NM-NM
RF Jumper
NM-NM
IN
OUT
-20dB
RF Jumper
NM-SMAM
RF
Jumper
NM-SMAM
-15.8dBm
-15.9dBm
IN
OUT
-20dB
See note 4
Network
IN
OUT
-30dB
Directional Coupler 1 (-30dB)
RF Jumper
NM-NM
+19.9dBm
20dB Fixed
Attenuator
RF Jumper
NM-TNCM
-10.1dBm
-60.1dBm
+9.7dBm
-16.0dBm
+19.9dBm
-68.5dBm
-16.2dBm
-138.5dBm
-138.6dBm
20dB Fixed
Attenuator
See note 6
Notes:
1. It is recommended that all unused ports be terminated at 50 ohms. When properly terminated, the possibility of false shutdown is minimized because high reflections at open
ports are eliminated.
2. The values shown in this drawing are only an example. Power levels encountered at each installation may require different coupling, pads, and threshold values.
3. This example assumes a BTS with power at the output set to 40dBm, co-pilot beacon output set at 20dBm.
4. Threshold Power Level in this example is set to -20dBm (Approximately 10dB below the power level at the monitor input.)
5. DAS Power Detection and Shutdown functionality:
- If RF Detector measures Input power lower than the Threshold Power Level set by
the user, then the Co-Pilot Beacon’s RF power output will be shut down.
- An alarm occurs. (Delay approximately one second on-off and one second off-on.
6. Co-pilot beacon signal reflecting back to the input of the CDMA timing source must never be allowed to exceed -124dBm.
-60.2dBm
10dB Fixed
Attenuator
10dB Fixed
Attenuator
20dB
Fixed
Attenuator
Typical Co-Pilot/BTS Interconnection with Internal CDMA Timing (MO Series)