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Running Loopback Tests
5100-A2-GB22-10
Loopback tests can help you isolate areas of trouble if you are having problems
with RTU operation or transmission. During a loopback test:
Your RTU's Test LED flashes every time it sends a packet.
Any data received from the network during loopback testing is lost.
Test operation is uni-directional, meaning that data is looped back to the PC
end of the connection only.
Procedure
To perform a loopback test:
1. Select Loopback from the Diagnostics
menu.
2. Click on one of the following:
— Local to perform local loopback
on the serial port path testing.
— Remote to perform serial port to
Central Office HotWire card path
testing.
— Internal Ethernet to perform
serial port to LAN path testing.
— External Ethernet to perform
serial port to LAN path testing.
Ethernet Loopback
Note: See
Cable
in Appendix B for
instructions on how to make a
test Ethernet Loopback cable.
3. If desired, click on Options to
specify the test parameters identified
in the Loopback Options screen. If not,
go to Step 4.
The Loopback Options screen enables
you to specify:
— Packet Count to indicate the
number of packets to be tested. The default is 10.
— Packet Size to indicate the size of packets to be tested. The default is
64 bytes.
Using the HotWire Diagnostics Utility
April 1997
3-9
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