Ras function, Ehavior in trouble, 1 behavior in trouble – Toshiba S20LP User Manual

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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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