Toshiba TOSLINE S20 - Manual (Page 40)

TOSLINE-S20 Active Star Coupler (ASC25) Instruction Manual 6F3B0360
TOSLINE S20 39
9.8 Precautions on laying cables
For handling optical connectors and cords, refer to the "7.4 Precautions on handling
optical fiber and connector" of the instruction manual.
(1) Precautions on laying cables
•
For the case of cable with connector, the front end cord and optical connector portions shall
be carefully prepared not to apply direct force to the portions.
•
Cables shall be laid in straight pattern as far as possible.
(2) Check of transmission loss
To monitor the connection condition of aligner after wired and to detect abnormality in
transmission loss caused from contamination on the connector edge faces, light power shall be
measured. The determination of the light power is done as follows.
Devices to be prepared
Light power meter 2 units (one shall have a reference light emission function)
Reference single-core cord 2 cords (each having a length of about 1 meters)
(A) Check of light power meter
One of the two light power meters shall be used as the light source, and the two
shall be connected as shown in the figure below, thus confirm the light emission
power.
Reference single-core cord
Light power meter (transmission side) Light power meter (receiving side)
Figure 9.17 Measurement of light emission power
Two reference cords shall be used to determine the light emission power.
Two cords for checking confirm that the reference cord is in normal state. Normally, both
cords give similar results.
(B) Determination of transmission loss in actual optical transmission line
The above-described power meters shall be placed at both ends of the optical
transmission line to determine the transmission loss. The difference between the
value observed at that moment at receiving side and the value observed at
receiving side with the reference cord becomes the transmission loss in actual
transmission line.
Transmission loss in actual transmission line = (Observed value with the
reference cord)
−
(Observed value in the transmission line)