Telestream PRISM MPI, User Manual

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Application Information
IP Session Application
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PRISM MPI-MPX User Manual
mode, the Announce and Sync messages are sent as multicast. However, the Delay
request and Delay Response messages are sent as Unicast.
– Some points to understand about communication modes:
– Whatever mode is chosen, the master and slave must match or be compatible.
– Multicast and Mixed mode may need IGMP joins and leaves Full Unicast must
have the master address in all slave AMTs.
– Unicast without negotiation does not allow master to regulate load.
– Two masters can be used on different domains to serve slaves on different
communication modes.
•
Delay Mechanism: Shows the delay mechanism mode being used:
Note:
The PRISM monitor currently supports only the End-to-End delay mechanism.
– End-to-End: In this mode, the sync, follow up, delay request, and delay response
messages go through the network all the way between the master and slave.
End-to-End mode is useful in PTP networks where some or all devices are not PTP
aware.
– Peer-to-Peer: In this mode, the Pdelay request and Pdelay response messages are
local to each link in the network. Each device determines the local link and
device delays. The sync message from the master then collects the corrections as
it propagates from the master to slave. Peer-to-Peer mode is useful in PTP
networks where the routing configuration changes. For Peer-to-Peer mode to
work well, all of the devices need to be PTP aware.
•
Message rates:
– Announce: Displays the rate of the Announce messages received from the
master. Typical values are 1 to 4 messages a second, but a wide range is allowed
by some profiles. If the value is lower than expected, it may indicate a problem in
the network or the master.
– Sync: Displays the rate of the Sync messages received from the master. Typical
values are 1 to 16 messages a second, but some profiles allow much higher rates.
If the value is lower than expected, it may indicate a problem in the network or
the master.
– Delay Request: Displays the rate of the Delay Request messages sent by the slave.
In multi-cast mode, the Delay Request rate is required to be set in response to a
field in the Delay Response message from the master. Typically the master sets
this field such that the Delay Request message rate is equal to the Sync message
rate.
Note:
For SMPTE mixed mode, PRISM sets the delay Request rate equal to the Sync
message rate received from the master.
– Delay Response : Displays the rate of the Delay Response messages received
from the master. Each Delay Request should have a matching Delay Response, so