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DIDCSU E1 Version
Table 4-12
Performance/Status Menu (24 hr E1 Performance Data Summary)
Command
En
Errored Seconds (ES): A second with one or more CRCs.
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-Signal (LOS) or Loss-of-Frame (LOF)
condition. The UAS condition is stopped when the failure condition clears.
Sn
Severely Errored Seconds (SES): This 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
10E-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. 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 DIDCSU is in a Loss-of-Signal state.
LOS is declared upon detecting 175+75 consecutive zeros, it is cleared with the receipt of
the next 1 bit.
Cn
Loss-of-Frame (LOF) Seconds: An LOF alarm is declared when a 3-second interval of
continuous Out-Of-Frame (OOF) or Loss-Of-Signal (LOS) state is detected. If at least 10
seconds elapse without an LOS or LOF error, the LOF alarm is cleared.
On
Out-of-Frame (OOF) Seconds: A condition when any three of four consecutive frame bits
received from the E1 line are incorrect.
Rn
Reset Registers: Use this option to clear out all counts and reset all registers to zero for a
particular port.
X
Exit the 24 hour Performance Data screen
Net Port Alarm
Threshold Status
Menu
4-22
Following is a brief description of the Performance/Status Menu
(24 hr E1 Performance Data Summary) options. When one of these
options is selected, the previous 24-hour data displays in 15-
minute increments for a total of 96 blocks of time.
Enter "T" from the Performance/Status Menu to access the Net
Port Alarm Threshold Status Menu. This menu shows the
threshold intervals set in the Net Port Alarm Threshold
Configuration Menu.
It also displays the counts for each type of alarm. When the alarm
count exceeds its threshold value set in the Net Port Alarm
Threshold Configuration Menu, a (Y) displays after the count.
Verilink DIDCSU 2912 User Manual
Description
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