User guide

Appendix C - Redundancy C-1

PPENDIX

REDUNDANCY

General

This appendix describes the optional redundancy services that protect critical

Vipersat network equipment. The two main services offered are VMS Redun-

dancy and Hub Modem Redundancy.

VMS Redundancy provides for N:1 redundant VMS server(s) (standby) co-

located at the Hub alongside the active VMS server. This configuration provides

for the automatic switch-over to a standby server in the event of a failure of the

active server.

Hub Modem Redundancy provides for the operation of N:M multiple primary

and multiple secondary modems installed at the Hub. If a protected device fails,

its output is automatically removed from the satellite network. A replacement

device, loaded with the failed device’s configuration, is booted into service and

its output is switched into the satellite network, replacing that of the failed

device.