MRV Communications TS700/G 用户手册

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M R V   C o m m u n i c a t i o n s ,   I n c .   –   I n s t a l l a t i o n   M a n u a l  
25 
 
 
A simple power loss test can inform us about the condition of the 
fibers. This test consists in measuring (with an optical power meter) 
the output power at one end of the tested fiber when a fiber source is 
connected at the other end. If the values are in dBm, the difference 
between the input power and the output power gives the power 
attenuation of the fiber (in dB). 
Optical Power Meter
dBm
Peripheral
Equipment
or
Optical Source
F/O
TX
Fiber Optic
Cable
 
In case the above equipment is not available, a simple visual test may 
be performed to locate and reject badly damaged fibers. Place a light 
source at one end of the fiber and intermittently block it and observe 
the light coming out of the other end. (This procedure does not 
guarantee that a fiber is acceptable) 
A standard 62.5
µµµµ
m fiber optic cable is characterized by an 
attenuation factor of about 3 to 5 dB/km. A loss value of more 
than 3 dB for runs up to 200m indicates that the fiber may be 
faulty. 
Note 
The fiberoptic cables must be installed by a qualified person. 
HANDLE THE FIBERS VERY CAREFULLY. 
 
2.   For TS700/100
 
 
Type   
 
For connecting the Transceiver to the peripheral equipment, 2-pair 
STP Category 5 cable is required (one pair for transmission, the other 
for reception). This cable must be a straight one when the peripheral 
has an MDI-X 100Base-TX interface and a Cross one otherwise. 
 
For PoE (Power over Ethernet), 2 more pairs STP Category 5 cable are 
required. (Use only for the Low Voltage version: TS100/A/FET/V3) 
 
Connectors  
The cable should be terminated with an RJ-45 connector at the 
Transceiver end.
 
 
Figure 3.1:  F/O cable test.