# Clocking.HBus.NetRefSource

Specifies a source to drive the NETREF timing signal on the CT bus.

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

#### Syntax

Clocking.HBus.NetRefSource = source

#### Access

Read/Write

#### Type

String

#### Default

OSC

#### Allowed values

OSC | NETWORK | STANDALONE

#### Example

Clocking.HBus.NetRefSource = STANDALONE

#### Details

Valid entries include the following values:

Value | Description
--- | ---
OSC | Specifies that the oscillator uses the board's local clock (for diagnostics only).
NETWORK | Specifies that the timing signal is derived from a device source (digital trunk). When using this keyword, you must also specify the trunk number with Clocking.HBus.NetRefSourceNetwork.
STANDALONE | Specifies that the NETREF clock is not driven.

#### See also

Clocking.HBus.NetRefSpeed