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This implementation tracks the receipt of duplicate messages on redundant communication paths to determine the health of the communications system.
English (United States)
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VTS R7.3-Method For Instantaneous Error Detection in a Redundant Communications
Disclosed is a method for instantaneously detecting errors in a redundant
communications path system. This system consists of two separate components:
Component A and Component B. There are two communication paths between
Component A and Component B that always forward duplicate copies of messages on
both paths. Figure 1 illustrates this system.
Figure 1: Redundant Communications System Between Two Components.
Component A always expects to see duplicate messages from Component B on both
communication paths during normal operation. During abnormal operation, Component
A does not receive duplicate messages on both paths. This informs Component A that
something could be wrong with one of the communication paths.
In a preferred embodiment, the 3494 Tape Library Dataserver, this method would be
implemented as described below.
Each of the LMs in the diagram below is a Library Manager and each is equivalent to
System A above. Both LMs are not required for this invention.
The 3590/3592 is a tape drive and is equivalent to System B above.
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Page 2 of 4
The LM interface is Ethernet.
The Dual Path Concentrator is an Ethernet Switch.
The Ethernet to Serial Swicth converts IP traffic to serial and serial traffic to IP.
The 3590/3592 drive interface is RS485 serial.
Each Dual Path Concentrator along with an Ethernet to Seria...