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PTP 250 User Guide Testing link end hardware
phn-2182_002v000
May 2011 8-9
Test ping packet loss
Using a computer, it is possible to generate and monitor packets lost between the PoE
power supply and the ODU. This can be achieved by executing the Command Prompt
application which is supplied as standard with Windows and Max OS X operating
systems.
To test ping packet loss, proceed as follows:
1
Ensure that the IP address of the computer is configured appropriately for
connection to the ODU under test, and does not clash with the IP addresses
of other devices connected to the network.
2 If the PoE power supply is connected to an Ethernet switch or router then
connect the computer to a spare port, if available.
3 If it is not possible to connect the computer to a spare port of an Ethernet
switch or router, then the PoE power supply will need to be disconnected
from the network in order to execute this test.
CAUTION
The following steps will disrupt network traffic carried by the ODU
under test:
Disconnect the PoE power supply from the network.
Connect the computer directly to the LAN port of the PoE power supply.
4 On the computer, open the Command Prompt application.
5 Send 1000 ping packets of length 1500 bytes. The process will take 1000
seconds, which is approximately 17 minutes.
If the computer is running a Windows operating system, this is achieved by
typing:
ping –n 1000 –l 1500 <ipaddress>
where <ipaddress> is the IP address of the ODU under test.
If the computer is running a MAC operating system, this is achieved by
typing:
ping –c 1000 –s 1492 <ipaddress>
where <ipaddress> is the IP address of the ODU under test.