Verilink DCSU 2911 (880-502647-001) Product Manual - Manual (Page 59)

DCSU 2911 E1 Craft Interface
Verilink DCSU 2911 User Manual 4-13
Choosing X returns you to the Performance/Status Menu:
Select P from the Performance/Status Menu to display the
Performance/Status Menu (Data Summary).
Figure 4-10 Performance/Status Menu (Data Summary)
When one of the following options from the Performance/Status
Menu (Data Summary) is selected, the previous 24-hour’s data is
displayed in 15-minute increments for a total of 96 blocks of time.
Press E
NTER to exit these screens:
-- DCSU 2911 PERFORMANCE/STATUS MENU --
24hr E1 Performance Data Summary
ES SES UAS LOF LOSS AISS
PORT 1 0 0 9932 9931 9932 0
PORT 2 0 0 9968 9967 9968 0
PORT 3 0 0 9932 9931 9932 0
PORT 4 0 0 9968 9967 9968 0
En) Errored Seconds Un) Unavailable Seconds
Sn) Severely Errored Seconds Fn) Frame Alignments Error Seconds
Dn) SEF Seconds Bn) Background Block Error
An) AIS Seconds Ln) LOS Seconds
Cn) LOF Seconds On) OOF Seconds
Rn) Reset Registers X) exit this screen
[1,1] DCSU 2911 >
Table 4-7 Performance/Status Parameters
Command Description
En Errored Seconds (ES): A second with one or more CAS or FAS defects.
Un Unavailable Seconds (UAS): Counted for every second in which an Unavailable Signal State
occurs with the onset of 10 contiguous SES errors. It is also defined as the number of
seconds a service is unavailable due to a Loss of Frame (LOF) condition. The UAS
condition is stopped when the failure condition clears.
Sn Severely Errored Seconds (SES): This error counts one second intervals with one or more
AIS defects or 320 or more CRC-4 errors.
Fn Frame Alignments Error Signal: This error occurs when the frame alignment threshold of
10 -3 errors in a given second is exceeded.
Dn Severely Errored Framing (SEF) Seconds: Those seconds in which two or more framing bit
errors occur within a 2-millisecond period.
Bn Background Block Error: An errored block not occurring as part of an SES.
An Alarm Indication Signal (AIS) Seconds: A count of one-second intervals containing one or
more AIS defects. AIS is an unframed All-Ones bit pattern that indicates an alarm
condition exists upstream in a circuit leading to the downstream equipment. This is also
called an All-Ones Keep-Alive or Blue Alarm Signal (as sent) or Red Alarm (as received). An
AIS defect is declared when there are 3 or fewer zeros in 512 bit times and there is a LOF
defect. It is cleared when there are 3 or more zeros in two frames or the LOF defect no
longer exists.
Ln Loss of Signal (LOS) Seconds: A second during which the DCSU is in a Loss of Signal state.
LOS is declared upon detecting 175 consecutive zeros, it is cleared with the receipt of the
next 1 bit.