DESCRIPTION AND OPERATION
INIIT03 INFI-NET TO INFI-NET TRANSFER MODULE
I-E96-607A
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respond as node off-line (NOL). Some messages, such as con-
trol and configuration messages, pass through the INIIT03
module unchanged and the original source of the message is
responsible for retrying them.
The local interface notifies the message source node when
there is a destination node off-line. It is then the responsibility
of the message source to refrain from sending messages to
off-line nodes.
Redundancy
Redundancy requires a full set of duplicate modules (four
INNIS01 modules and two INIIT03 modules). The secondary
transfer module continuously monitors the primary. A failover
occurs when the secondary IIT detects a primary module fail-
ure on Controlway. When this happens, the secondary
assumes responsibility and the primary is taken off-line. The
new primary INIIT03 module brings its NIS modules on-line.