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4.3 RAS Functions
4.3.2 Loopback function
4
FUNCTIONS
(3) When a local station is powered down
When power of a local station is turned OFF, data link is disabled.
Viewing from the master station, loopback occurs at the station just before the faulty
station, and data link is performed among data-link-executable stations only. (The
power-off station is disconnected.)
Figure 4.13 When a local station is powered down
Master station
No.2,
loopback station
No.1
Forward loopReverse loop
No.5 No.3 (Power OFF)No.4,
loopback station