Microwave Data Systems MDS entraNET 2400 Spezifikationen PDF herunterladen (Seite 181)

05-4055A01, Rev. D GE MDS entraNET Reference Manual 171

The most significant fields are 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 Carrier Detected value is greater

than a few dozen, there may be trouble with interference, or a loss of the

Ethernet signal. Note that this does not refer to the over-the-air (RF) car-

rier, but only to the Ethernet carrier.

When troubleshooting throughput quality issues, a check should also be

made of the Radio Packet Statistics Screen shown in Figure 3-45 on

Page 81. This menu provides a review of packet statistics from a radio

link (RF) perspective.

It is also helpful to check the RSSI of incoming signals. If the RSSI

levels in each zone are within a few decibels (dB) of each other, but less

than –90 dBm, then check the aiming of the antenna system.

See “Aiming Directive Antennas for Maximum RSSI” on Page 162 for

details.

NOTE: The average signal level should be –95 dBm or stronger for

reliable performance with an allowance for fade margin.

Another place to look for trouble is in Packets Received by Zone. The

packets should be evenly distributed across all zones (1-5% variation).

If they are not, interference in the disparate zones should be suspected.

Blocking these zones may eliminate or reduce harmful interference.

See “Skip Zones Menu” on Page 53 for more information.

When dealing with radio interference troubles, be sure to review A Word

About Radio Interference on Page 150.

Serial Port and Remote Serial Statistics Menu

(See Figure 3-43 on Page 79 for detailed information)

This screen provides top-level information on data exchanges between

the radio serial ports and the network through the wireless and the

Ethernet (data) layers. These include:

You can use this information as an indicator of port activity at the data

and IP levels.

Diagnostic Tools

(See MAINTENANCE AND TOOLS on Page 85)

The AP Maintenance Menu contains a tool that is especially useful to

network technicians—the PING utility. The PING utility can be used to

verify reachability of Ethernet devices connected to the network.

• Bytes In On Port xxx • Bytes In On Socket xxx

• Bytes Out On Port xxx • Bytes Out On Socket xxx

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Microwave Data Systems MDS entraNET 2400 Spezifikationen Seite 181