Loopback Features
135
Loopback Responder
To perform loopback testing, touch the
button and select LOOP BACK as the
test type.
To have XTT 5000 respond to loopbacks, configure the
tab,
setting Responder as the Type. XTT 5000 will enact a Layer 1, Layer 2, or Layer 3
loopback as instructed in the command.
Use caution when using loopback mode, because some network equipment may
not allow the loopback of some frames. It can cause such equipment to shut down
the port.
•
The graphic on the Signal window shows how Loopback mode works. In
Loopback mode, a red 'LB' status banner appears in the Status Bar, reporting
status such as "LB Running” or "LB Waiting.”
•
The test set will only respond to those loop commands addressed to it.
•
In this mode the layer is NOT selected.
•
XTT 5000 will
not
respond to any loop commands until you press
. Once
the test has started, XTT 5000 will go into a waiting for loopback command
state. A screen message informs you that the test set is in the waiting for
loopback command state.
•
The test set's MAC and IP address appear, as appropriate.
•
Once XTT 5000 receives a loop-up command from the received traffic, it will
begin looping back frames based on the layer indicated in the loop command
frame: Layer 1, Layer 2, or Layer 3.
•
A screen message appears, informing you that the test set is in an active
loopback state.
•
When XTT 5000 receives a loop-down command from the received traffic, it
will cease looping back frames and re-enter the waiting for loopback
command state.
•
Once you stop the test, XTT 5000 will return to the waiting for loopback
command state.
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