Black Box LW0050A Manual page 104

PRO 11 SERIES WIRELESS ETHERNET
Problem and
Indication
High-quality
signal but
throughput is
poor.
Link signal
quality low or not structural interference.
as good as
expected (indoor
installation).
Link signal
quality low or not with certain aspects of
as good as
expected (out-
door installation).
102
Possible Cause
1. Too much interference 1. Move the unit or the antennas out of
or multipath propagation. the range of interference.
2. Ethernet port of the
unit may be faulty.
1. Possible multipath or
There may be a problem
outdoor installation con-
siderations.
Corrective Action
• Check counters to see if more than
10% of total transmitted frames are
retransmitted fragments
(see Section 3.6.1).
• Check if more than 10% of total
received data frames are bad
fragments (see Section 3.6.1).
2. Verify Ethernet port activity by
checking Ethernet counters (see
Section 3.6.1).
Reposition the unit outside range of
possible interference.
• Check for heavy metal structures (for
example, elevators, racks, file
cabinets) near unit.
• Check counters for excessive retrans-
missions or received bad fragments.
• Site may require higher-gain
antennas.
• Site may require a multicell structure
(multiple Access Points) because of
multipath/structural interference.
Refer to Section 5.3:
• Is there a clear line of sight?
• Verify antenna height.
• Verify antenna polarization.
• Verify antenna alignment.
• Check length of cable between
antenna and unit (an overly long
extension cable may adversely affect
performance).