# Clocking.HBus.ClockSourceNetwork

Specifies the trunk to use as an external network timing reference for the board's internal clock.

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

#### Syntax

Clocking.HBus.ClockSourceNetwork = trunk_number

#### Access

Read-only

#### Type

Integer

#### Default

1

#### Allowed values

1 to 8 (1-based trunk number)

#### Example

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

If the Clocking.HBus.ClockSource keyword is not set to NETWORK, this keyword is ignored.