Paradyne 3616, 3615 manual Bilateral Loopback, Digital Test, End-to-End Test

Operating the DSU

When a DBM (control or tributary) originates Remote Digital Loopback, both the originating DBM and the targeted DBM enter Test mode. No other test can be run at the originating DSU or the targeted DSU until the Remote Digital Loopback is aborted.

The DBM does not generate test results.

NOTE

To activate a V.54 Loopback from the NMS to a DSU, first enable V.54 Lpbk (DSU option set) at both the control and tributary DSUs. Then, select

3600 remote-digital at the NMS, not V.54-remote-digital.

Bilateral Loopback

Bilateral Loopback (Bilat Lpbk) is a combination of DTE and Digital Loopbacks operating simultaneously in the same DSU. Both Bilateral and Digital Loopbacks are selected from the DSUpt (DSU Port) or DBMpt (DBM Port) option set.

NOTE

If Bilat Lpbk is enabled, requesting a Remote Digital Loopback or Digital Test will automatically initiate a DTE Loopback, as well.

Digital Test

Only available to a DBM, the Digital Test (DT) checks the functionality of a pair of DBMs. This test is run on the DBM over the backup connection to a remote DBM for point-to-point testing.

The remote DBM is placed in Digital Loopback, then the local DBM transmits the 511-bit test pattern over the network to the remote DBM for an operator-specified length of time.

During the test, the TXD, RXD, and RTS LED indicators show the states of the leads at the DTE interface if the DBM port leads are being displayed. At the conclusion of the test, the local DSU releases the remote DBM from Digital Loopback.

To review the results of the test, select Displ (Display)

and press the key to scroll through the results shown in Table 4-3.

When the test is over, the top line displays Final instead of Active.

		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.)

End-to-End Test

Only available to the DBM, the End-to-End (EE) Test analyzes a control and a tributary DBM, and the network circuit between them in both directions independently. It transmits fixed packets (or blocks) of data between the 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.

3615-A2-GB20-20 December 1996 4-11