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8.5 Geo Redundancy Operation
8.5.1
Geo Redundancy Overview
Building a geographically diverse network provides resiliency against natural disasters,
catastrophic events or inclement weather that can cause network outages. Hot standby or
1:N redundancy is certainly appealing and protects traffic in the event of a single point of
failure but doesn't protect the network when the whole earth station goes down. Geo-
Redundant distributed systems tackles the core issue by providing another diverse hub that
simultaneously operates with the same functionality, albeit in standby mode. The idea of
Geo Redundancy is if a user's primary hub goes down, the service that is normally tied to
that hub will connect to the secondary hub, thus preserving network traffic. The minimum
hub equipment required would be two Q-Multiflex-400 units at different locations with a
reliable network in-between, as shown below.
IP Traffic
and control
Customer
Network
IP Traffic
and control
Figure 8-25 – Minimum Geo Redundancy Configuration
Both teleports need identical equipment, with the same software and hardware features.
The Q-MultiFlex-400 units are connected together via an Ethernet and RF monitoring
process. If the problem cannot be fixed at the main hub level, for example, if the main
teleport is subject to major propagation problems or suffers from a catastrophic failure, then
the geographical redundant teleport takes over.
The QMultiFlex-400™ Hub equipment will be connected to the customers Ethernet switch
and Router, which will allow both sites to receive and transmit Traffic and M&C data via a
common Ethernet Backbone. When in bridging mode, the Standby modem will
automatically learn to bridge the traffic as necessary, once it comes on-line.
QMultiFlex-400™ Installation and Operating Handbook
On-Line Hub
Standby Hub
8-29
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