User`s guide

MDS 05-2806A01, Rev. E.1 MDS iNET 900 Series User’s Guide 117
Packet Statistics Menu
(See Packet Statistics Menu on Page 81)
This screen provides detailed information on data exchanges between
the unit being viewed and the network through the wireless and the
Ethernet (data) layers. These include:
The most significant fields are the Packets Dropped, Retries, Retry
Errors, Receive Errors and Lost Carrier Detected. If the data values are
more than 10% of their sent and received counterparts, or the Lost Car-
rier Detected value is greater than a few dozen, there may be trouble
with radio-frequency interference or a radio link of marginal strength.
Review the RSSI by Zone Screen’s values (Page 77) for zones that are
more than 2 dB (decibels) below the average level, and for signal level
values that are likely to provide marginal service. For example, an
average level is less than –85 dBm during normal conditions with a data
rate of 256 kbps.
If the RSSI levels in each zone are within a few dB of each other, but
less than –85 dBm, then a check should be made of the aiming of the
antenna system and for a satisfactory SWR. Refer to RADIO (RF) MEA-
SUREMENTS on Page 123 for information on antenna system checks.
NOTE: For a data rate of 512 kbps, the average signal level should be
–77 dBm or stronger with no interference.
Serial Port Statistics Menu
(See Serial Data Statistics Menu on Page 87)
This screen provides top-level information on data exchanges between
the unit’s serial ports and the network through the wireless and the
Ethernet (data) layers. These include:
Wireless Packet Statistics
• Packets received • Packets dropped
• Packets sent • Receive errors
• Bytes received • Retries
• Bytes sent • Retry errors
Ethernet Packet Statistics
• Packets received • Packets dropped
• Packets sent • Receive errors
• Bytes received • Retries
• Bytes sent • Retry errors
• Lost carrier detected
• Bytes In On Port xxx • Bytes In On Socket xxx
• Bytes Out On Port xxx • Bytes Out On Socket xxx