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User Guide for Cisco Digital Media Manager 5.2.x
OL-15762-03
Chapter 19 Content Distribution and Delivery
Concepts
DMS-CD Overview
Activation Anyone who has purchased a valid license to use this release of Cisco Digital Signs also has a perpetual license to
use its built-in implementation of DMS-CD. No additional software is required and there is no recurring cost.
Cisco DMS Content Distribution (DMS-CD) is a file delivery and management mechanism. It conserves
network bandwidth and optimizes playback performance by provisioning creative assets directly to your
DMPs. You can use FTP or SFTP to transfer multiple playlists and presentations to DMP local storage.
• Store assets locally on the flash memory card that is preinstalled inside a DMP.
• Store assets locally on an external USB hard drive or flash drive that you attach to a DMP.
Retry Timeout
• The factory default Retry Count value is 5.
• The factory default Retry Timeout duration is 300 seconds.
Given these values, you can expect that DMS-CD—when it uses default values—takes as long as
1,500 seconds (25 minutes) to detect assets or determine that a DMP is unreachable and give up. In cases
when this duration is too long, you might try changing the Retry Timeout value from 300 to 30.
Concurrent Deployments
Most DMS-CD deployment preference settings that you define take effect during the next scheduled
DMS-CD deployment. However, any time that you change the “Number of concurrent deployments”
value, you must restart your DMM appliance and run a scheduled DMS-CD deployment before the
changed setting takes effect on your DMPs.
DMS-CD Performance Factors
• Differential Download Intelligence, page 19-4
• Bandwidth Consumption, page 19-4
• Resumption of Interrupted and Paused File Transfers, page 19-5
Differential Download Intelligence
Differential download intelligence in DMS-CD prevents the needless provisioning of any asset more
than once to any DMP that uses it and already has downloaded it, even if you have used the asset
repeatedly in multiple playlists or presentations. Your DMPs retain their valid assets and download only
what is new or has changed.
Bandwidth Consumption
A systemwide threshold that you define limits in your WAN how much bandwidth is used per session
when DMS-CD provisions assets to one of your DMPs.
For example, a limit of 1.2 mbits means that file transfer speeds for DMS-CD deployments cannot
exceed the maximum threshold of 1.2 mbits per DMP.
Thus, if your deployment provisions assets to 20 DMPs, the maximum WAN bandwidth that DMS-CD
uses is 24 mbits, because 20 x 1.2 = 24.