Toshiba TOSLINE-S20 Instruction Manual page 41

The transmission loss in the transmission line is the sum of the transmission loss across
the optical fiber and the connection loss of aligner.
(C) Comparison with level diagram
Comparing with the level diagram which was prepared during design stage, if the
transmission loss of the transmission line is abnormally large, the portion
structuring the transmission line should be abnormal. Thus, the inspection shall
be given to individual sections.
(3) Check on system up
At the point of system up, check on the LED display status at each station to judge the
performance of normal transmission. For the meaning of display, refer to the instruction manuals
of individual stations.
40 ASC25 Instruction Manual