Comtech EF Data Vipersat CDM-570 User Manual page 110

A p p l i c a t i o n s w i t c h i n g
Each application type will have been assigned a bandwidth allocation when the
policy for the remote site is established. The voice application, for example,
might have had the bandwidth set in the policy to handle three simultaneous
voice connections. When a VoIP protocol is detected in the H.225 signaling
protocol, the modem/router requests the VMS to switch the bandwidth to
accommodate three voice circuits.
The same process applies if the protocol detected is Video.
When both VoIP and Video are requested, the bandwidth required for the Video
is used and the VoIP, which has priority, shares the SCPC with the Video.
Once VMS receives the request to switch, it determines if there is a free demod-
ulator and if there is bandwidth space available to handle the requested applica-
tion. If the resources are available, the VMS then performs the switch.
Applications are streaming data. The remote modem/router looks at the stream-
ing data flow until it sees a break in the data exceeding 10 seconds. Once a
break is detected the modem/router presumes that the application is terminated
(or has malfunctioned), drops the carrier, and makes the bandwidth resources
available for another service.
V i p e r s a t C D M - 5 7 0 / 5 7 0 L U s e r G u i d e
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