L-IP User Manual
105
LOYTEC
Version 6.1
LOYTEC electronics GmbH
4.
Node device failure:
A node fails due to power failure or device failure. As a result the
node cannot perform its function anymore and cannot be reached by its communication
partners (A,B,C).
9.1.2 Conventional Strategies for Redundancy
Although CEA-709.1 allows introducing redundancy by allowing for a pair of conventional
CEA-709.1 routers (twin routers) to be identically configured and connected between the
same two channels, this configuration increases the traffic between those two channels two-
fold. The built-in duplicate detection mechanism in CEA-709.1 discards the duplicate
packets at each receiving node. However, the extra traffic could tax available network
bandwidth significantly and create other problems. Further, this addresses only some of the
above faults: “2. Router device failure” and to a limited extend “1. Broken connection on
the backbone”
2
.
Using CEA-709/IP Routers with a redundant IP infrastructure allows building a redundant
backbone (“1. Broken connection on the backbone”). But still the connection to the router
(switch, cable) remains a single point of failure.
9.2 L-IP Redundant Operating Modes
9.2.1 Bus Loop Monitoring
To achieve redundancy against “3. Broken cable in the segment” (see Section 9.1.1) the
L-IP allows building a ring structure by connecting both ends of the bus cable to the L-IP
Redundant (see Figure 98).
2
Assuming a redundant backbone.