Paradyne 3551 manual End-to-End Test, Bit Error Rate Test

Operating the DSU

		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 By1		Information Displayed
Time:	Local and		Running test timer. (The Clr selection resets the timer to 0:00:00.)
	Remote DSU/DBM
Tot Block:	Local and remote		Number of blocks completed. (The Clr selection resets the counter to 0.)
	DSU/DBM
Rx Blk err:	Local and remote		Number of incoming blocks with errors detected, indicating a fault in the
	DSU/DBM		incoming transmission path. (The Clr selection resets the counter to 0.)
Tx Blk err:	Local and remote		Number of blocks with errors detected at the remote DSU, indicating a
	DSU/DBM		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.

3550-A2-GB20-20 December 1996 4-11