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Configuring Adaptive Clocking for CTP Bundles (CTPView)

The adaptive clocking configuration allows you to modify attributes that affect the adaptive clocking algorithm. The default settings are acceptable for most applications. We recommend that you change these settings only with the assistance of JTAC.

Before you begin:

  • Log in to the CTPView software at least at the Net_Admin level.

  • Connect the CTPView server to the CTP device for which you want to configure bundles.

To configure adaptive clocking for CTP bundles using CTPView:

  1. In the side pane, select Bundle > Configuration.
  2. Run your mouse over the Display and Select an Existing Bundle bar.
  3. In the table of bundles, select the bundle that you want to modify.
  4. Under Port Options in the Clock Cfg field, select Adap Rate - Ext Clk or Adap Rate - Int Clk.
  5. Select Adaptive Clocking Options Show to display adaptive clocking parameters and configure the parameters as described in Table 1.
  6. Click Click to Submit Bundle AND Port Changes.
Table 1: CTP Bundle Adaptive Clocking Settings in CTPView
Field Function Your Action

Initialize Adaptive Settings

Sets the adaptive clocking configuration to the default settings.

Select Yes.

Aggressive Calc Period

Specifies the time period during initial start of adaptive clocking during which packet samples that are experiencing the least delay through the network are collected. These samples are used for aggressive state calculations.

Enter a number from 3 through 200 seconds.

Maintenance Calc Period

Specifies the time period during normal adaptive clocking during which packet samples that are experiencing the least delay through the network are collected. These samples are used for maintenance state calculations.

Enter a number from 3 through 300 seconds.

Slope for Maintenance

Specifies the number of packets per minute, which, when reached, causes the adaptive clocking algorithm to change from aggressive state to maintenance state. Lower values result in longer switchover times with a clock value closer to the remote clock.

Enter a number from 1 through 100 packets per minute.

Maintenance Decay

Specifies how quickly the clocking corrects to the buffer set point while in maintenance state.

Enter a number from 2 through 120 seconds.

Max Clock Adjustment Value

Specifies a cap for frequency acceleration, which constrains the frequency adjustments to the adaptive clock.

Enter a number from 1 through 200 parts per billion.

Max Clock Offset

Specifies a cap for frequency velocity, which constrains the frequency velocity of the adaptive clock.

Enter a number from 1 through 400 packets per minute.

Max Buffer Error

Specifies the buffer error rate required to change the adaptive clocking algorithm state from maintenance to aggressive.

Enter a number from 100 through 1,000,000 microseconds.

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