Using Buffer Sampling to Monitor Packet Delay for CTP Bundles (CTP Menu)

The CTP device uses buffer sampling to monitor packet delay. Buffer samples are based on the amount of time that packets are in the buffer. The time is measured from when a packet arrives from the Ethernet interface to when it is transmitted out the serial interface.

You cannot display buffer sampling in CTPView.

To display buffer for a CTP bundle using the CTP Menu:

From the CTP Main Menu, select 1) Bundle Operations.
Select the type of bundle.
Select a bundle from the list.
Select 8) Runtime Diags.
Select 8) Buffer Query.
A list of buffer counts appears. Table 1 describes the fields in the buffer counts.

Table 1: Buffer Counts for CTP Bundles in the CTP Menu
Field Name	Description
Total Samples	Number of packets measured since the last time the count was cleared.
Smallest Sample	Within the total number of samples, the smallest sample measured in milliseconds. Packets in this sample experienced the most delay.
Average Sample	Within the total number of samples, the average buffer fill, in milliseconds.
Largest Sample	Within the total number of samples, the largest sample measured in milliseconds. Packets in this sample experienced the least delay.
Largest Buffer Jitter	Difference between the largest sample measured and the smallest sample measured, in milliseconds. This number corresponds to system packet delay jitter.