Nortel Networks 3500, NTRN10AN manual Storage and retrieval of physical PMs

Operation, administration, and maintenance (OAM) features 2-113

OPRN

OPRN is the deviation from the receivers midpoint operational range. This value is expressed as a percentage and is derived from the following formula:

(O PR – OPR nom inal)

O PRN = 2 --------------------------------------------------------- 100

￿(OPRmax – O PRmin )￿

Where:

• OPRnominal is the midpoint operational range of the receiver

• OPRmax is the maximum received optical power

• OPRmin is the minimum received optical power

OPRN is 0% when the received power is equal to the nominal value (mid- range value), 100% when the received power is at the maximum level of the operational range, and -100% when the received power is at the minimum level of the operational range.

Storage and retrieval of physical PMs

For the physical PMs, the following PM registers are stored and can be retrieved:

• untimed (taken every second), OPR parameter only

• current 15-minute interval, OPRN parameter only

• current day, OPRN parameter only

• last 32 15-minute intervals, OPRN parameter only

• previous day, OPRN parameter only

Note: The OPRN current 15-minute and current day bins are updated once at the start of each interval (15-minutes or 1-day).

Resetting registers and invalid data flag

Both OPR and OPRN registers can be reset. Resetting the OPRN register causes that value to be recalculated.

The physical PM OPR and OPRN parameters will have an invalid data flag (IDF) value when the measured value is beyond the minimum or maximum values.

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004