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Hitless switching, Hitless switching . . . . . . . . . . . . . . b-2, Figure b-1 hitless switching screen – Comtech EF Data CDD-56X Series Vipersat User Manual

Page 102

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General

MN/22137, rev 1

B-2

Vipersat CDD-56X Series User Guide

back to these intelligent modem/routers, effectively managing the Vipersat

network operation in real time, and optimizing each site’s bandwidth usage to

meet their QoS and cost requirements within their bandwidth allocation. The

result is a stable satellite network connection that automatically responds to the

customer’s requirements while continuously monitoring and reacting to chang-

ing load, data type, and QoS requirements.

Hitless Switching

Unless inherent delays in configuring both ends of a satellite bandwidth link

during dynamic switching are accounted for, transmitted data may be lost

during the transition. The time for a switch command to be sent across the satel-

lite link (~ 250 ms), the command processing time, as well as receiver acquisi-

tion time must be considered. The Vipersat Hitless Switching feature provides

a means to coordinate timing and utilize buffering to eliminate these data

outages.
The parameters for configuring the Hitless Switching feature for a CDM-570/

570L are set from the screen shown in figure B-1. This screen is accessed from

the STDMA/SCPC Auto Switching screen (see figure B-2 and figure B-4).

Figure B-1 Hitless Switching screen

• Enable/Disable – The Hitless Switching screen will initially display all

lock times as -1, indicating that the feature is disabled. The Restore

Default Lock Times command is used to enable this feature.

• Delay for Mod – This parameter allows the operator to insert additional

delay to buffer more data after modulator transmission is ceased.

• Delay for Demod – This parameter allows the operator to insert additional

delay to account for the tuning of the demodulator.