ADC Device Server v11.61.4
Installation, Configuration, and Operations Reference
List Redundancy
List Redundancy
About List Redundancy
List Redundancy is an option of ADC Device Server v11 that is designed to add extra security to the automated broadcast system playout. Since this feature is only useful for the play out, the feature is only applied to transmission lists and not to media lists, GMT lists and so on…
Purchase Note: List Redundancy is a for-purchase option to Device Server. Contact your
Automation Sales representative for details.
Reference Note: For more information reference the ADC List Redundancy Control Client
Reference document.
IMPORTANT: Cloning and List Redundancy are considered mutually exclusive functionalities.
The List Redundancy Process
List Redundancy uses two Transmission Lists running the same programs in parallel, and independently, from distinct but similar devices (mostly videodisks) - if a problem occurs on one of the redundant lists, due to a device error for instance, the other redundant lists will keep on playing.
These lists can run on two Device Servers (MAIN & BACKUP) simultaneously. To achieve this, both lists must have the same event content, e.g. the lists are mirrored, and must be synchronized to play out events in a synchronous way. The List Redundancy gives a control on the Mirroring and on the Synchronization to the operator.
In order to have both redundant lists mirrored and synchronized, one redundant list has to provide all needed information to the other. So, the list providing information is called the
‘Master List’ and the list receiving information is called the ‘Slave List’. Editing the Air Client connected to the Master List will automatically make the same edits to the Slave list.
Same program: The List Redundancy guaranties that the Master List is mirrored into the
Slave List, and so that both lists have the same content.
Same running point: The List Redundancy guaranties that Master List and Slave List are synchronized, and so that programs are running the same way.
Overall control: The List Redundancy gives operators the ability to manually control the above functions.
The following graphic illustrates the List Redundancy process.
© 2014 Imagine Communications Corp. Proprietary and Confidential 22-April-2014 | Page 334 of 410
ADC Device Server v11.61.4
Installation, Configuration, and Operations Reference
List Redundancy Process
List Redundancy
Insert
1
Device Server A
MASTER
LIST
2
Insert
Freeze
Play List
Device Server B
MASTER
LIST
Freeze Play
DEVICE
1
An operator inserts an event into the Master List.
2
The command is echoed to the related Slave List, if the list content or state has changed.
3
The Slave List refreshes its content.
3
Device Server C
SLAVE
LIST
SLAVE
LIST
DEVICE
DEVICE
DEVICE
Functions
The List Redundancy provides following major functions:
Master List / Slave List: For a given transmission channel, Master and Slave Lists can use their own controlled devices to do play out, they can also share some of devices
(normally assigned to the Master List).
The Slave List handles the missing media, and keeps the synchronicity with the Master
List when the Master List is malfunctioning, and allows the operator to use the Slave List to control program play out.
Note: If an operator attempts to use the Control Panel to edit or control a slave playlist, a
warning/error message is displayed indicating the “operation can't be applied to slave
list.”
List Mirroring: The List Mirroring guaranties that both redundant transmission lists have the same content.
List Synchronization: The List Synchronization guaranties that both redundant transmission lists have the same running point.
© 2014 Imagine Communications Corp. Proprietary and Confidential 22-April-2014 | Page 335 of 410
