User manual

Computer Gateway User Manual 5-8 5/96
5.6.1
5.6.1 Explanatory Notes to Figure 5-1
Note 1 RESTORE message is expected only while host processor is in INIT state.
Receipt of this message, at any other time, indicates violation of the 3-minute
time limit between dispatch of a RESTORE and receipt of a RESTORE
COMPLETE, by the CG.
Note 2 Data messages occur only in response to requests from the host processor and
cannot occur in this state.
Note 3 Each Data Message ultimately must be responded to with a Positive
Confirmation Message (this excludes only Time Synch and the Confirmation
messages themselves). No additional messages can be sent until the
confirmation is received.
Note 4 Negative Confirmation messages can occur only following the sending of a
Data Message.
Note 5a No Data Messages can be sent from this state.
5b The Data Messages sent from this state are those required for database
initialization and end with a Restore Complete message. Any message types are
confirmed by the CG, but ignored.
5c No message can be sent until the previous message has received a Positive
Confirmation from the CG.
Note 6 Applies to only Dual Bisynch Link configuration. Host processor should alarm
link failure and wait for hardware-level communication to be resumed on both
links.
Note 7 The Message Counter must be incremented before retransmission of a message
over a dual link.