User guide
Appendix F - Automatic Switching F-1
A
PPENDIX
AUTOMATIC SWITCHING
General
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 VMS to meet QoS or other require-
ments 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 intelligent modem/routers and uses this data to issue commands
back to the Vipersat Modem/Routers effectively managing the Vipersat network
operation in real-time, optimizing each user’s bandwidth usage to meet their
QoS, and cost requirements, within their bandwidth allocation. The result is a
stable satellite network connection automatically responding to customer’s
requirements while continuously monitoring and reacting to changing load, data
type, and QoS requirements.