# Clocking.HBus.ClockMode

Specifies whether the board is a clock master driving A_CLOCK or B_CLOCK, or is a clock slave driven by one of these clocks.

For information about setting up CT bus clocking, and rules and restrictions for configuring CT bus clocking, refer to Configuring board clocking.

#### Syntax

Clocking.HBus.ClockMode = setting

#### Access

Read/Write

#### Type

String

#### Default

STANDALONE

#### Allowed values

MASTER_A | MASTER_B | SLAVE | STANDALONE

#### Example

Clocking.HBus.ClockMode = MASTER_A

#### Details

Valid entries for this keyword include:

Value | Description
--- | ---
MASTER_A | The board is a clock master that drives A_CLOCK.
MASTER_B | The board is a clock master that drives B_CLOCK.
SLAVE | The board is a clock slave that derives its timing from the primary bus master.
STANDALONE | The board does not drive any CT bus clocks. Connections are not allowed to the board's CT bus timeslots in standalone mode. For more information about this mode, refer to CX 2000C clocking capabilities.

For more information about clocking, refer to the NMS OAM System User's Manual.

#### See also

Clocking.HBus.AutoFallBack, Clocking.HBus.ClockSource, Clocking.HBus.FallbackClockSource, Clocking.HBus.NetRefSource, Clocking.HBus.NetRef2Source