Comtech EF Data Vipersat CDM-570 Uživatelská příručka stáhnout pdf (Strana 111)

Appendix B - Automatic Switching B-1

PPENDIX

AUTOMATIC SWITCHING

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

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Comtech EF Data Vipersat CDM-570 Uživatelská příručka Strana 111