Running ping
- You can select payload length in ping. The flag for this selection varies
depending on ping vendor. Select suitable one to get packetloss between 0%
and 100%. 56 bytes are default. Use max. 1472.
- If you have neither scientific calculator, nor access to www nor local running copy of Ronja web,
then select only 14, 56, or 1472 bytes of ping payload
- If the ping allows you to specify -c to send packet as soon as the
previous one arrives, use this flag.
- If you are using the -c flag, then run two instances of the
ping at the same time (in different xterm windows or consoles).
- Do not use the -f (flood ping) option. This would render the
measured BER invalid.
- Leave the ping to run long enough to have multiple dropped packets.
The longer the better precision.
- Press ctrl-c and read out the packetloss (in %)
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|
Calculate BER
- Online BER calculator
- If ping payload is 14, 56, or 1472, use the graph, page 22
(PDF),
(PostScript) with the correspondence
between ping payload and ethernet payload
| Ping payload | Ethernet payload
|
|---|
| 14 | 42
| | 56 | 84
| | 1472 | 1500
|
-
- nbits=8*ping_payload+400
- bgr=(1-packetloss/100)^nbits, where packetloss is in % (from
0 to 100) and x^y means x powered (exponentiated) to y
- ber=1-bgr
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