Reduce Rf Mtu Size; Reduce Rf Network Bit Rate; Increase Oip Retries Limit; Troubleshooting Tools - Cal Amp Dataradio HiPR-900 User Manual

Wireless radio modem

Table of Contents

7.4.2 Reduce RF MTU size

As this is a shared band, interference is not always avoidable. Another way of improving performance is

by reducing the RF MTU size (see section 6.7.3.2). This effectively reduces the amount of time each data

frame is exposed to interference, thus reducing retry traffic. A good starting point is 576 bytes instead of

the default 1500.

Note:

Values down to 300 may be necessary.

Normally the system is able to utilize the normal bit rate of 512k (see section 6.7.2.3). If you have a very

low signal level (-90 dBm or less) or the RF signal levels are close to an elevated noise floor level, you

can try running at 256K instead of 512k (changeable on the fly without a reset). It could result in better

overall performance.

Only available in Router mode, OIP Retries Limit is normally set to two (2). Gradually increasing it up to

five (5) in extreme cases, may provide a slow but reliable link when none was possible with weak signals.

Use in conjunction with a 256K network bit rate.

7.5

•

PING

The ping command determines whether a specific IP address is accessible. It works by send-

ing a packet to the specified address and waiting for a reply. It is useful for troubleshooting

"end-to-end" reachability, network connectivity, and network latency.

Available for MS-Windows 9x, ME, NT, 2000, and XP as well as Unix & Free BSD.

EXAMPLE:

ping 192.168.204.1 displays the response with turn around time in milliseconds.

•

TRACERT (WINDOWS)

The tracert command is used to visually see a network packet being sent and received and

the number of hops required for that packet to get to its destination.

Available for MS-DOS 6.2, MS-Windows 9x, ME, NT, 2000, and XP.

Note:

Users with MS-Windows 2000 or XP who need additional information on network laten-

cy and network loss may also use the pathping command.

EXAMPLE

tracert www.yahoo.com at the command prompt displays the intermediate routers be-

tween local host to the ww.yahoo.com site.

001-5099-000

HiPR-900 User Manual

Table of Contents