Canoga-perkins 9145E NID Software Version 4.10 Manuel d'utilisateur télécharger pdf (Page 75)

Diagnostics 9145E NID Software User’s Manual

Network Performance

negative. Negative Jitter occurs when consecutive packets arrive with a shorten interval

relative to the interval defined when they were transmitted. For example, buckets

(packets) four and five were transmitted with a time interval (offset) of 80ms but arrive

with an interval of 60ms separating them. Positive Jitter is the opposite, that is,

consecutive buckets arrive with a lengthened interval relative to the interval with which

they were transmitted.

13. Jitter Buckets define the collection criteria for a Network Performance Assurance test to

identify the number of packets that fall within a specific boundary of Jitter. Profile Jitter

Bucket values define the bucket such that any Jitter value greater than the previous Jitter

Bucket value and less than or equal to this Jitter Bucket value will be tallied in this bucket.

Near-to-Far and Far-to-Near Jitter Buckets are defined using the same set of values. The

NID will collect data for both.

A maximum of nine Jitter Buckets can be defined where the [0] bucket is always defined.

The first bucket is always defined as the negative Packet Timeout value up to 0, and the

last bucket is from 0 to the Packet Timeout value. For example, if you set the Packet

Timeout to 8 msec, the largest Jitter Bucket you can define (in milliseconds) would be

8,000 msec.

• Set Notation is used to show the values within a bucket.

• Values are entered in milliseconds (msec) with up to three levels of precision, there-

fore, supporting bucket definitions up to 1 microsecond (µsec).

4000.00 = 4 seconds

0250.000 = 1/4 second or 250 msec

0020.000 = 2/100 second or 20 msec

0000.001 = 1/1,000,000 second or 1 microsecond (µsec)

• Bucket values will be inserted based on their numerical values

14. Purge Result Records allows you to delete all the PM Records. The total number of

records for this Profile is displayed.

4.6.2.3 SAM and CPM Profile Information Setup

The following screen is used to setup the SAM and CPM components. All fields are used by

SAM. CPM requires fields 3, 4, 5, 6 and 7.

For more information about SAM, see the section “Service Availability Monitoring” on page 78.

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Canoga-perkins 9145E NID Software Version 4.10 Manuel d'utilisateur Page 75