# Clocking.HBus.BriRef

Activates or deactivates the special AG 2000-BRI clock fallback mechanism.

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.BriRef = setting

#### Access

Read/Write

#### Type

String

#### Default

NO

#### Allowed values

YES | NO

#### Details

If enabled, when the clock master's references both fail, the AG plug-in selects another board to provide a timing reference for the clock master. The signal is passed to the clock master using NETREF.

#### See also

Clocking.HBus.ClockMode, Clocking.HBus.ClockSource