Verilink PRISM 4001 (34-00244) Product Manual - Manual (Page 24)

4-4 Terminal Operation PRISM 4001
Maintenance Screen
The Maintenance screen (Figure 4-4) allows the user to per-
form loop and BERT test functions on the DDS and DTE
circuit. In this screen, the user can activate and clear loops
and the BERT tester. BERT is performed by using on -board
test facilities. No other test equipment is needed. Some of
these tests may also be activated by the front panel toggle
switch as described in the Operation chapter. Actions initi-
ated by each field are detailed in the following paragraphs.
Clear Tests
Pressing ENTER in this field clears all tests and any line
loops that have been initiated.
Clear Alarms
Pressing ENTER in this field clears all near-end alarms. If
alarm conditions remain present, alarms are reactivated
once thresholds are exceeded.
Test Loops
The 4001 can be looped from a local user interface session,
from a remote user interface session, by loop codes in the
network receive data stream, or by reversal of the loop seal-
ing current. There are two loop points in the 4001: one at
the DDS network interface and one at the data port (DTE)
interface. Loop status changes can be made by the user only
when the BERT function is not in the active mode.
L OOP
Select the type of loop test by toggling the spacebar, then
execute the test by pressing ENTER. The near-loop choices
are LOCAL, V.54, and FAR V.54. The far-loop choice is
V.54 only. The 4001 can execute more loops than it can gen-
erate (for example, it cannot generate a Line or Data loop).
U NLOOP
Pressing ENTER takes down the specified loop.
L OOP M ODE
Gives the user a choice of how the data is to be looped back,
whether BIDIRECTIONAL or UNIDIRECTIONAL
The following are the four types of loops that can be acti-
vated on the 4001:
4001 DSU x.xx/x.xx PRISM 4001 Local Screen
4001 DSU x.xx/x.xx Unit Address: X
------------------------- ELEMENT MAINTENANCE --------------------------
(CLEAR TESTS) BERT: [DDS NETWORK]
(CLEAR ALARMS) Test Length: [Cont. ]
Loop: [LOCAL] Pattern Sync: NO TEST
Unloop: [LOCAL] Elapsed Time: 00:00:00
Loop Mode:[BIDIRECTIONAL ] Bit Errors: 0
Errored Seconds: 0
(Enable Far End Datalink) % EFS: 100
NET Status: LOS (START TEST)
DTE Status: OK (RESET ERRORS)
Near Loops:
Far Loops:
Figure 4-4 Maintenance Screen