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Chapter 6. Diagnostics
DTE
Payload BERT
This selection performs a bit error rate test on the selected port.
This test in non-intrusive to the other three ports. Only one BERT
test may be performed at a time. This test is normally performed
from the remote and local ends simultaneously to determine
whether the errors are coming from the transmit or the receive
direction. See Figure 6-7.
DTE
DTE Loopback
This test is used to verify proper operation of the link between the
T3SU 300 and the terminal equipment. During this test, all data
sent by the terminal equipment is looped back to the terminal
equipment. A block diagram illustrating the loopback point and the
signal path is shown in Figure 6-8.
While in DTE Loopback, data from the host is transmitted into the
network.
6-6
T3SU 300
MUX
Figure 6-6. Payload Loopback Test
T3SU 300
MUX
Figure 6-7. Payload BERT Test
T3SU 300 User Manual
BERT OUT
BERT IN
61200217L1-1
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