The backhaul network which interconnects the sites and
control centers is the big-ticket item on your comms
resilience list. Protection measures such as multi-path
routing, ring structures and duplicate bearers should be
included, to guarantee high system availability.
Investigate your choice of bearers too – each has its own
Multi-channel trunked radio sites provide inherent
protection from channel failure; if a channel goes down,
the remaining channels will automatically adjust to
maintain normal trunked operation. Traffic handling
capacity will be reduced, but radio users don’t need to
take any special action to maintain communication, as
the channel controller always selects a channel from
those available. Your users will normally be unaware of
AND GETTING A GOOD
Duplicating your control center function can protect
against the loss of your dispatch facility in the event of
fire or evacuation. You could specify a fully-redundant
back-up center, or you can spread control between
two (or more) centers in different locations that are
normally operational so any one center can take up the
load from a disabled center when needed.
4. COWs (Comms On
Extreme weather events can indiscriminately put
communication sites or their linking out of action. A
COW (Communication on Wheels) trailer or truck with
its own repeaters, antenna and linking capability can
provide temporary communications in an affected area.
Adding a small, rugged Private Broadband LTE system
can offer high speed data.
How many levels of backup do you need?
What industry or legislative regulations
are in place? What options will give you
the most resilience for your investment?
Richard Winter, a Senior Systems
Engineer at Tait, considers some of the
ways your network design can eliminate
single points of failure and increase the
resilience of your network.