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(4) Enhanced RAS functions
(a) Continuation of communications at system down of the control station
Even if the control station goes down, a normal station (sub-control station) will take over the control to
continue data link. ( Page 124, Section 4.4.1)
(b) Disconnection of a faulty cable and station
Any disconnected cable or faulty station can be isolated from the network, and data link can be continued
among normally operating stations. ( Page 125, Section 4.4.2)
(c) When a disconnected station recovers from an error, the station is automatically
reconnected to the network
When a station disconnected from a network due to a data link error recovers from the error, the station is
automatically reconnected to the network and restarts data link. ( Page 127, Section 4.4.3)
This automatic return does not affect data link.
Switching
Control station
No.1
Sub-control station
No.2
Normal station
No.4
Normal station
No.3
Down
Control station
No.1
Loopback station
Normal station
No.6
Loopback station
Normal station
No.2
Normal station
No.5
Sub-control station
No.3
Loopback station
Normal station
No.4
Loopback station
Down
Down
When recovered
from fault
Control station
No.1
Normal station
No.2
Normal station
No.4
Normal station
No.3
Control station
No.1
Normal station
No.2
Normal station
No.4
Normal station
No.3
Reconnected
Down
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