Westell Inc. CSI-DSP85-U7C ユーザーズマニュアル
- 9 -
All cables should be checked for shorts and opens. Also verify that there are no cables with loose or poor connec-
tions. RF leakage could cause oscillation to occur under some conditions.
tions. RF leakage could cause oscillation to occur under some conditions.
The rooftop antenna (Donor Antenna), if directional, should be checked for proper alignment along the calculated
compass heading. Typically, the directional antenna would be aimed at the same site that your handset uses, but it may
not always be so.
compass heading. Typically, the directional antenna would be aimed at the same site that your handset uses, but it may
not always be so.
It is critical the installer contact the service provider for information on, and approval
of, the site he or she has selected before the system is turned on.
If cables and alignment are acceptable and a problem persists, it may be necessary to use a spectrum analyzer to
examine the signal environment in which the DSP85 is operating. The existence of strong adjacent channel signals
within the frequency band(s) can cause the AGC to reduce the amplifier ’s gain or cause alarms. In some cases
additional filtering or attenuation might be required to reject these unwanted signals. In some instances, the donor
antenna can be reoriented horizontally, to place the interference source in an antenna pattern “null”. There also may be
some cases where the interference from outside signals is so great that they cannot be filtered or otherwise reduced
or eliminated without expensive and possibly prohibitive measures. In these cases it may not be practical to use the
CSI-DSP85 for providing coverage to these sites.
examine the signal environment in which the DSP85 is operating. The existence of strong adjacent channel signals
within the frequency band(s) can cause the AGC to reduce the amplifier ’s gain or cause alarms. In some cases
additional filtering or attenuation might be required to reject these unwanted signals. In some instances, the donor
antenna can be reoriented horizontally, to place the interference source in an antenna pattern “null”. There also may be
some cases where the interference from outside signals is so great that they cannot be filtered or otherwise reduced
or eliminated without expensive and possibly prohibitive measures. In these cases it may not be practical to use the
CSI-DSP85 for providing coverage to these sites.
TO INSIDE ANTENNA
TO OUTSIDE ANTENNA
1:1 PORT CONFIGURATION
Input: One single band port, from the single band donor.
Output: One single band port to the DAS.
There are no physical connections provided to specifically communicate system or alarm status. This information is
embedded in the information accessible via the communication ports described earlier.
embedded in the information accessible via the communication ports described earlier.
Monitoring & Alarms
System Set-Up Considerations
Selection of external attenuators to be used in line with the Antenna Port(s)