Ras function, Ehavior in trouble, 1 behavior in trouble – Toshiba S20LP User Manual
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32
6
F
3
B
0
3
5
6
5. RAS function
5.1 Behavior in trouble
(1)
Optical fiber system
•
Station down
If a station (either main, back-up or general) becomes down, the abnormal station will be
disconnected from the S20LP system (re-configuration), then communications of remaining
stations will be re-started. If two station (either main, back-up or general terminals) become
power off, the S20LP system will split into two independent S20LP systems at the power
off stations.
S20LP
STN #1
S20LP
STN #2
S20LP
STN #3
S20LP
STN #6
S20LP
STN #5
S20LP
STN #4
OTR1
OTR2
OTR1
OTR2
OTR1
OTR2
OTR1
OTR2
OTR2
OTR1
OTR2
OTR1
OTR2
OTR1
OTR2
OTR1
OTR2
OTR1
OTR2
OTR1
OTR1
OTR2
OTR1
OTR2
Power off
Power off
S20LP loop No.1
S20LP loop No.2
•
Transmission cable breakage
If both transmitter and receiver lines are broken (*1) or if one of the two lines is broken
(*2), the S20LP system will cut off the broken lines.
S20LP
STN #m
S20LP
STN #l
OTR1
OTR2
OTR1
OTR2
OTR1
OTR2
OTR2
OTR1
To S20LP STN #n
To S20LP STN #o
(*1)
(*2)
Broken lines
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