Direct I/O Messaging
Direct I/O allows for the sharing of
high-speed digital information between
multiple UR relays via direct back-to-back
connections or multiplexed through a
standard DS0 multiplexer channel bank.
Regardless of the connection method,
direct I/O provides continuous real
time channel monitoring that supplies
diagnostics information on channel health.
Direct I/O provides superior relay-to-relay
communications that can be used in
advanced interlocking and blockingschemes.
• Communication with up to 16 UR relays
in single or redundant rings rather than
simplistic point-to-point configurations
• Connect to standard DS0 channel
banks through standard RS422. G.703
or IEEE C37.94 interfaces or via direct
fiber optic connections
• Built-in continuous loop and channel
monitoring provides real-time
diagnostics of your communication
channels with no external or handheld
tester required
LAN Redundancy
Substation LAN redundancy has been
traditionally accomplished by reconfiguring
the active network topology in case of
failure. Regardless of the type of LAN
architecture (tree, mesh, etc), reconfiguring
the active LAN requires time to switchover,
during which the LAN is unavailable. UR
devices deliver redundancy as specified
by PRP-IEC 62439-3. which eliminates
the dependency on LAN reconfiguration
and the associated switchover time. The
UR becomes a dual attached node that
transmits data packets over both main and
redundant networks simultaneously, so in
case of failure, one of the data packets will
reach the receiving device with no time delay.
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