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Chapter 6. Diagnostics
6-6 T3SU 300 User Manual 61200217L1-1
Data Mode
Ends a test already in progress.
Payload Loopback
This selection initiates a Payload Loopback test for all data on the
selected port rather than for the entire DS3. During this test, the
data is looped back in the network direction. Perform this test to
verify the integrity of the portion of the DS3 link connecting the
selected port of the T3SU 300 and the remote DTE. This test is non-
intrusive to the three other ports. See Figure 6-6.
Figure 6-6. Payload Loopback Test
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.
This test does not interrupt data flow from the network to the DTE, but it
does block all DTE-to-network data for the selected port.
DTE
MUX
T3SU 300