Setting Up
5-23
9161-A2-GH30-30 April 1998

Table 5-3. Synchronous Data Port Options (7 of 7)

Excessive Error Rate (EER) Alarm
Possible Settings: Enable, Disable
Default Setting: Enable
Specifies whether an alarm is generated when an excessive error rate condition is
detected on the synchronous data port.
Excessive Error Rate does not appear if:
– Embedded Data Link is set to Disable.
– Management Link is set to FDL on the Network Interface Options screen (see
Table 5-1).
Enable – Generates an alarm.
Disable – Does not generate an alarm.
Excessive Error Rate Threshold
Possible Settings: 10E-4, 10E-5, 10E-6, 10E-7, 10E-8, 10E-9
Default Setting: 10E-4
Sets the error rate threshold that determines when an excessive error rate (EER)
condition is declared for a synchronous data port. The EER is determined by the ratio of
the number of CRC5 errors to the total number of bits received over a set period of time.
Excessive Error Rate Threshold does not appear if:
– Excessive Error Rate is set to Disable.
– Embedded Data Link is set to Disable.
– Management Link is set to FDL on the Network Interface Options screen (see
Table 5-1).
– Both Near-End and Far-End Performance Statistics are set to Disable.
10E-4 – Declares an EER if more than 1,535 CRC5 errors are detected in a 10-second
period. Clears when fewer than 1,536 CRC5 errors are detected within the same time
period.
10E-5 – Declares an EER if more than 921 CRC5 errors are detected in a 60-second
period or a 10–4 condition occurs. Clears when fewer than 922 CRC5 errors are
detected within the same time period.
10E-6 – Declares an EER if more than 92 CRC5 errors are detected in a 60-second
period or a 10–5, or 10–4 condition occurs. Clears when fewer than 93 CRC5 errors are
detected within the same time period.
10E-7 – Declares an EER if more than 9 CRC5 errors are detected in a 60-second
period or a 10–6, 10–5, or 10–4 condition occurs. Clears when fewer than 10 CRC5
errors are detected within the same time period.
10E-8 – Declares an EER if more than 41 CRC5 errors are detected in three 15-minute
intervals or a 10–7, 10–6, 10–5, or 10–4 condition occurs. Clears when fewer than
42 CRC5 errors are detected within the same time period.
10E-9 – Declares an EER if more than 4 CRC5 errors are detected in three 15-minute
intervals or a 10–8, 10–7, 10–6, 10–5, or 10–4 condition occurs. Clears when fewer than
5 CRC5 errors are detected within the same time period.