GE MDS MDS iNET-II 900, Справочное руководство

Страница: 129 / 190

05-2806A01, Rev. H iNET Series Reference Manual 119
3.2.2 Packet Statistics Menu
(See
Packet Statistics Menu on Page 91
)
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 87) 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)
MEASUREMENTS on Page 139 for information on antenna system
checks.
NOTE: For a data rate of 512 kbps (1 Mbps for iNET-II), the average
signal level should be –77 dBm or stronger with no interfer-
ence.
3.2.3 Serial Port Statistics Menu
(See
Serial Data Statistics Menu on Page 99
)
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:
You can use this screen as a indicator of port activity at the data and IP
levels.
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