Universal Device Driver Reference Manual

1.165 Delay-Line-Mirror

The Delay-Line-Mirror logical device complements the Delay-Line device for applications in a N:1 protection setup. The Delay-Line-Mirror duplicates the transmit power setting of the redundant chain to a parameter called 'output' which can be mirrored from the Delay-Line devices in the operative chains. For a complete description how Delay-Line devices work and why to use them to mirror the transmit power in a N:1 protection setup read the description of the Delay-Line device.

To configure a Protection-Switch-N-To-1 device with Delay-Line devices in the operative chains and a Delay-Line-Mirror in the spare chain, setup the devices as follows:

For each operative setup a Delay-Line device and make it watch the output power of this chain. If applicable, set the offset parameter each Delay-Line to compensate for the signal path attenuation differences occuring when a HPA is replaced by the redundant one.
For the redundant chain setup a Delay-Line-Mirror device which replicates the spare chain output power.
If the Protection-Switch-N-To-1 device uses the automatic enumeration / indexing of device names, name the devices according to this scheme (eg. DLY-1, DLY-2 .. DLY-R).
Set the Delay-Line/Delay-Line-Mirror devices as the Level device (levelPrefix) and choose DELAY-LINE as Level type (levelSetType) in the Protection-Switch-N-To-1 device.

The Protection-Switch-N-To-1 device will mirror the output power which was active some seconds before to the spare chain in case of a switchover.

Device window pages

The following table shows which device window pages are available with this individual device type. Tool-bar functions not mentioned here are described at the general description of device windows .

--- Shows the actual output power of the assigned, apre chain.
--- The device info page.
--- The maintenance page. The configuration parameters from this page are described below.

Configuration parameters

At the maintenance page of the device window there are a couple of configuration parameters which must be set to interconnect the Delay-Line-Mirror device with the device that sets the output power of the spare chain.

parameter	description
pwrSetId	Enter the ID of the parameter which sets the output power of the chain.

Variables defined by this device driver

name	type	flags	range
info.driver	TEXT	R/O	StringRange R/O
info.type	TEXT	R/O	StringRange R/O
info.port	TEXT	R/O	StringRange R/O
info.frame	TEXT	R/O	StringRange R/O
config.pwrSetId	TEXT	SAVE SETUP	StringRange
output	FLOAT		DoubleRange (0.0 .. 0.0)