Automatic Switching; General - Comtech EF Data Vipersat CDD-562L User Manual

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UTOMATIC

General

Automatic switching is a feature of the VMS that allows dynamically changing
the network configuration in response to changes in either traffic type (Applica-
tion switching) or network traffic loads (Load switching.)
The following material applies to the Vipersat CDM-570/570L, CDD-562L/
564/564L, and CDM-600. For purposes of simplicity, these units shall be
referred to as modem/routers.
The basic signal topology in a Vipersat network is TDM (Time Division Multi-
plex) outbound and Vipersat's proprietary STDMA (Selected Time Division
Multiple Access) inbound. The STDMA slots can have their duration and band-
width allotments varied to tailor bandwidth allocation to meet the bursty traffic
load of a typical data network.
When required, a network is switched from STDMA to SCPC. SCPC band-
width is allocated from a bandwidth pool by the VMS to meet QoS or other
requirements for the duration of a connection. When the SCPC connection is no
longer required, the bandwidth is returned to the pool for use by another client.
This basic structure gives the VMS-controlled network its flexible, automated
network utilization and optimization capability.
The VMS has the intelligence to interpret the constantly changing statistics
gathered by the Vipersat modem/routers and uses this data to issue commands
back to these intelligent modem/routers, effectively managing the Vipersat
network operation in real time, and optimizing each user's bandwidth usage to
A p p e n d i x A u t o m a t i c S w i t c hi n g
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WITCHING
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P P E N D I X
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