Cisco Cisco StadiumVision Director Manuale Di Manutenzione

This section includes the following topics:

Restrictions for PTP on the SV-4K and DMP-2K Media Players, Page 38

Guidelines for NTP and PTP on the SV-4K and DMP-2K Media Players, Page 39

Modifying the PTP and NTP Configuration on the SV-4K and DMP-2K Media
Players, Page 40

Verifying PTP Operation for the SV-4K and DMP-2K Media Player, Page 44

Restrictions for PTP on the SV-4K and DMP-2K Media
Players

Before you configure PTP on the SV-4K and DMP-2K media players, consider the

following restrictions:

By default, PTP messages will not cross VLANs and PTP master candidates

need to be identified for each VLAN and configured in the Management

Dashboard.

However, Cisco StadiumVision Director Release 4.1 introduces a configurable

Precision Time Protocol (PTP) Time To Live (TTL) setting in the Management

Dashboard. The PTP TTL specifies the number of VLANs that can be crossed for

selection of a PTP master. The default value of 1 (recommended) means that

each VLAN will elect its own PTP master.

NOTE: For ease of configuration for venues with multiple VLANs,
the system is configured by default to list all SV-4K and DMP-2K
devices as eligible PTP master candidates. However, be aware
that although this simplifies configuration, the time that it takes for
the devices to arbitrate a master device in each network will vary,
and depends on the number of eligible devices in each network.

Content synchronization for video playback on the SV-4K and DMP-2K media

player relies on precise time across DMPs using PTP. The behavior is similar to

content synchronization on the Cisco DMP 4310G. If SV-4K devices are playing

video and one of the devices reboots, the rebooting unit will restart video playback

from the beginning and will only synchronize with the other players when the next

item in the playlist is rendered.

38 of 80