Verilink DPRI 2922 (880-503142-001) Product Manual - Manual (Page 62)

Configuring the DPRI 2922 Via the NCM 2000 Craft Interface
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Verilink DPRI 2922
Table 3-19
Performance/Status Menu (24hr T1 Performance Data Summary) Commands
Command Description
En Errored Seconds (ES): A second with one or more AIS, LOS, or LOF 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.
Bn Bursty Seconds (BES): A second having between 2 and 319 CRC-6 (Cyclical Redundancy Check
error events.
Sn Severely Errored Seconds (SES): This error counts one second intervals with an AIS or CRC
error.
Ln Loss of Signal (LOS) Seconds: A second during which the DPRI 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.
Fn Severely Errored Framing (SEF) Seconds: Those seconds in which two or more framing bit
errors occur within a 3-millisecond period. In ESF mode, this interval may or may not coincide
with an ESF multiframe.
Dn 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 T1 line are incorrect.
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 an LOF defect. It is cleared when there are 3 or more zeros in two
frames or the LOF defect no longer exists.
Cn Controlled Slip Seconds: This error indicates that in a one second interval one or more slip
events occurred. An accurate count of controlled slips that occur can only be made at the
terminating network element where the slips take place.
The current version of the firmware does not support this feature.
Mn Loss of Frame Counts: An accumulation of the number of times a Loss-Of-Frame alarm is
declared.
Zn AIS/SEF Seconds: Displays information on the AIS and SEF errors.
AIS: An unframed All-Ones bit pattern that indicates that 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.
SEF: The seconds in which two or more framing bit errors occur within a 3-millisecond period.
In ESF mode, this interval may or may not coincide with an ESF multiframe.
Qn Errored Seconds Type A: This error occurs when one Code Violation Path (CV-P) error and no
AIS defects occur in a second. Controlled Slips are not included in this parameter.
Hn Frame Bit Error (FE): An error in the received framing bit pattern and the number of whole
seconds that a framing bit error has occurred.
Jn Degraded Minutes (DM): This error occurs when the Bit Error Rate (BER) threshold of 10 -6 is
exceeded in a 60 second period.
In Error Free Seconds: A second with no detected errors.