Verilink DCSU 2911 (880-502647-001) Product Manual - Manual (Page 39)

DCSU T1 Craft Interface
Verilink DCSU 2911 User Manual 3-17
Net Port Alarm
Threshold Status
Submenu
Enter T from the Performance/Status Menu to access the Net Port
Alarm Threshold Status Menu. This menu shows the threshold
intervals set from the Net Port Alarm Threshold Configuration
Menu obtained by typing the command A from the Main 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 (
YYYY) displays after the count.
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.
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 (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 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 (as sent) or Red Alarm (as received).
• 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 of10 -6 is
exceeded in a 60-second period.
In Error Free Seconds: A second with no detected errors.
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
Command Description