Technical data

www.westermo.com Theoretical and general applications 129
Ringswitch
Our ringswitches are available in two variants, for basic ring networks and for bridged
ring networks. The models feature different software for reconfiguration FRNT0 and
FRNT1.
FRNT0
There are always two alternative directions for traffic in a ring, a right-handed or left-
handed circuit. A ringswitch utilises this and in doing so eliminates network errors.
Should an error occur the switch, which is configured as the focal point, is notified. This
reconfigures the network so that everyone can communicate with each other.
FRNT1
Some switches have the capability to connect together several rings whereby further
reliability is achieved. These rings are bridged using a primary and secondary link to
other rings in the network. When an error occurs on the primary link, the focal point
is notified. This then reconfigures the network and connects the secondary link to the
underlying ring. When a cable failure occurs this must be rectified and with redundan-
cy this error will not be detected unless an alarm is generated at the same time.
FRNT0
FRNT1
Primary
Secundary Secundary
Primary
B A C K