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Operating the DSU
4-113550-A2-GB20-10 February 1995
Table 4-3
Digital Test Results
Results
Information Displayed
Time: Running test timer. (The Clr
selection resets the timer to
0:00:00.)
Tot Error: Running count of bits in error;
Max, if the maximum error
count has been reached, the
maximum being 64000. (The
Clr selection resets the counter
to 0.)
Err Secs: Running count of errored
seconds. (The Clr selection
resets the counter to 0.)
Run on:port
nn
If this test was not run on an
aggregate data path, the Digital
Test was run on port
nn
.
End-to-End Test
The End-to-End (EE) Test is used to analyze a control
and a tributary DSU or DBM, and the network circuit
between them in both directions independently. It
transmits fixed packets (or blocks) of data between DSUs
or DBMs When an End-to-End Test is run, diagnostic data
may be disrupted.
To view the results of the test, select Displ (Display)
and press the
key to scroll through the results shown
in Table 4-4.
When the test is over, the top line displays Final
instead of Active.
Bit Error Rate Test
The Bit Error Rate Test (BERT) is a session-
disruptive test that transmits a 511-bit pattern. It analyzes
the network circuit. It can monitor the results by putting
the remote DSU or DBM into Digital Loopback and
checking the returned pattern for errors, or by
simultaneously executing a BERT in the local DSU.
The test continues until aborted from the DCP or NMS.
This test can be run on a per-port basis if a TDM/Flex is
installed. A control DSU can initiate a Bit Error Rate Test
in a point-to-point or a multipoint network. A tributary
DSU can only initiate this test in a point-to-point network.
If nondisruptive diagnostics are in effect (if Diag Type
is set to NonD), diagnostic data can be disrupted.
To display the results of the test, press F2 to select
Displ. The results are shown in Table 4-5. To clear the
results of the test and clear the counters to zero, press F3
to select Clr.
Table 4-4
End-to-End Test Results
Results
Reported By
1
Information Displayed
Time: Local and
Remote DSU/DBM
Running test timer. (The Clr selection resets the timer to 0:00:00.)
Tot Block: Local and remote
DSU/DBM
Number of blocks completed. (The Clr selection resets the counter to 0.)
Rx Blk err: Local and remote
DSU/DBM
Number of incoming blocks with errors detected, indicating a fault in the
incoming transmission path. (The Clr selection resets the counter to 0.)
Tx Blk err: Local and remote
DSU/DBM
Number of blocks with errors detected at the remote DSU, indicating a
fault in the outgoing transmission path. (The Clr selection resets the
counter to 0.)
Rx TimOuts: Local DSU/DBM only Number of blocks that were not received or acknowledged by the
remote DSU or DBM. (The Clr selection resets the counter to 0.)
1
Local
refers to the test initiator.