Verilink 2048 (34-00179) Product Manual - Manual (Page 27)

Terminal Operation 4-7 2048 PMU/NTU
LOFC: The loss of frame count parameter represents a
count of ‘Carrier Failure’ condition declarations, according
to the following criteria:
A carrier failure condition is declared if a LOS or OOF
condition persists for 2.5 seconds. For intermittent LOS or
OOF conditions, the following time integration method is
applied. The decay time (time subtract) slope during a
normal signal should be 20% of the rise slope. The carrier
failure condition is cleared when 1 second passes without
a LOS or OOF condition occurring.
SS: The slip seconds parameter is the count of one-second
intervals during which a frame slip occurred. Frame slips
occur only if ‘Internal’ or ‘Network’ clocking is selected.
The ‘ Enhanced 24 Hour ’ and ‘ Enhanced 30 Day ’
screens show data for CRC Errored Seconds (CRCES), Out
of Frame Seconds (OOFS), Loss of Signal Seconds (LOSS),
Alarm Indication Signal Seconds (AISS), Remote Alarm
Seconds (RAS), and Bipolar Violation Seconds (BPVS).
4.5 Maintenance Screen
The ‘ Maintenance ’ screen (Screen 4 -5) allows the user
to perform test and maintenance functions on the E1 circuit.
BERT is performed using on-board test facilities. Therefore,
no other test equipment is needed. Actions initiated by each
field are detailed in the following paragraphs.
Clear Tests: Pressing <return> on this field clears all tests
and any loops that have been initiated.
Screen 4-5 Maintenance
2048 PMU x.xx/x.xx 2048 PMU Date MM/DD/YY
Far End Line Loop (Unit Address: xxx) Time HH:MM:SS
----------------------------- ELEMENT MAINTENANCE ------------------------------
(CLEAR TESTS) Pattern: [QRSS]
(CLEAR ALARMS Test Length: [15 min]
Loop: [NET LLB][AIS ] Pattern Sync: IN SYNC
Unloop: [DTE PLB] Elapsed Time: 01:15:00
Bit Errors: 5
Errored Seconds: 3
% EFS: 97.5
(STOP TEST )
NET Status: OK (RESET ERRORS)
DTE Status: N/A
Near Loops:
Far Loops: NET LLB
Clear Alarms: Pressing <return> on this field causes all
near end alarms to be cleared.
Figure 4-3 Loopbacks
Network
Framer
DTE
Far NET PLB
TARGET
PMU
Framer
Far NET LLB
DTE
Framer
Framer
Near NET LLB
Near DTE PLB
Near NET PLB
Near DTE LLB