NT5D33 and NT5D34 Lineside E1 Interface cards Page 291 of 906Circuit Card Description and Installation— an alarm message is created in the alarm log and the MMI terminal— the LEI card enters line-conditioning mode— a yellow alarm message is sent to the CPE/LTULine processing sends the CS 1000S, CS 1000M, and Meridian 1 either all“on-hook” or all “off-hook” signals, depending on the dip switch setting ofthe card. See Table 99 on page 270.When the Set Alarm command is selected, the prompt appears for settingthe threshold level and duration for alarm levels 1 and 2.The E1 link processes at a rate of approximately 2.0 mb/s. The thresholdvalue indicates the ratio of the total number of bits that must be detected asbeing in error per second before the LEI activates an alarm. It can be setbetween 3 and 9 and can be different for each alarm level. Any other valueentered will cause the MMI to display a “Parameter Invalid”message. The digit entered as the threshold value is a number representing anegative power of 10 as shown in Table 106.Note: The error-rate threshold for a level 2 alarm must be greater (asmaller power of 10) than for a level 1 alarm. Remember that thenumbers being represented are negative numbers. Since 3 represents –3,and 4 represents –4, 4 represents a smaller number than 3 does.Table 106E1 bit error rate threshold settings (Part 1 of 2)Alarm threshold biterrors per second inpower of 10Threshold to setalarmAllowable DurationPeriods10-3 2,000/ second 1-21 seconds10-4 200/second 1-218 seconds10-5 20/second 1-2148 seconds10-6 2.0/second 1-3600 seconds10-7 2.0/10 seconds 10-3600 seconds
