# Clocking.HBus.NetRefSource

Specifies a source to drive the NETREF timing signal on the H.110 bus.

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.NetRefSource = argument

#### Access

Read/Write

#### Type

String

#### Default

STANDALONE

#### Allowed values

OSC | STANDALONE

#### Example

Clocking.HBus.NetRefSource = STANDALONE

#### Details

A CX 2000C board can drive this signal only from its internal oscillator. Use this configuration for development purposes only.

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

#### See also

Clocking.HBus.AutoFallBack, Clocking.HBus.ClockMode, Clocking.HBus.ClockSource, Clocking.HBus.FallbackClockSource, Clocking.HBus.NetRef2Source, Clocking.HBus.NetRefSpeed, Clocking.HBus.NetRef2Speed