Verilink DIDCSU 2912 (880-502646-001) Product Manual Instrukcja Użytkownika Pobierz pdf (Strona 94)

DIDCSU E1 Version

4-22

Verilink DIDCSU 2912 User Manual

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.

Table 4-12 Performance/Status Menu (24 hr E1 Performance Data Summary)

Net Port Alarm

Threshold Status

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 (

) displays after the count.

Command Description

Errored Seconds (ES): A second with one or more CRCs.

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.

Severely Errored Seconds (SES): This counts one second intervals with one or more AIS

defects or 320 or more CRC-4 errors.

Frame Alignments Error Signal: This error occurs when the frame alignment threshold of

10E-3 errors in a given second is exceeded.

Severely Errored Framing (SEF) Seconds: Those seconds in which two or more framing bit

errors occur within a 2-millisecond period.

Background Block Error: An errored block not occurring as part of an SES.

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.

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.

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.

Out-of-Frame (OOF) Seconds: A condition when any three of four consecutive frame bits

received from the E1 line are incorrect.

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

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 106 107

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