# Clocking.HBus.FallBackNetwork

Specifies the trunk to use as an external network timing reference if the clock source defined with Clocking.HBus.ClockSource fails.

For more information about setting up CT bus clocking and about the rules and restrictions that apply to setting up clocking with CG 6565E boards, refer to Configuring board clocking.

#### Syntax

Clocking.HBus.FallBackNetwork = trunk_number

#### Access

Read/Write

#### Type

Integer

#### Default

1

#### Allowed values

1 to 8 (1-based trunk number)

#### Example

Clocking.HBus.FallBackNetwork = 1

#### Details

The board must have multiple external network connections and the Clocking.HBus.FallBackClockSource keyword must be set to NETWORK to take effect.

The Clocking.HBus.FallBackNetwork entry is a one-based number, while the x entry in the NetworkInterface.T1E1[x].Type keyword is a zero-based number.

#### See also

Clocking.HBus.AutoFallBack