Always switch off the power to each device before connecting it to your 
621T, 621R. After connecting your 621T, 621R, connect its power and 
then switch on the power to each device. 
We recommend testing your system configuration by first connecting 
the entire system (as illustrated in Figure 3), using short copper cables 
instead of optical fiber cables. 
To connect the 621T, 621R as illustrated in the example in Figure 4: 
You can use the 621T and 621R to configure a DVI optical transmitter and receiver 
system as illustrated in Figure 3: the source connects to the 621T, the 621R 
connects to the display, and both transmitter and receiver are interconnected via 
fiber optics and UTP cabling. 
 
Figure 3: 621T and 621R DVI Optical Transmitter and Receiver System 
5.1  Connecting the 621T/621R DVI Optical 
Transmitter/Receiver 
To connect the 621T DVI Optical Transmitter with the 621R DVI Optical Receiver, 
as the example in Figure 4 illustrates, do the following: 
1.  Connect the DVI source (for example, a computer) to the 621T DVI IN 
connector, using the DVI cable. 
Make sure that the system is not powered up when connecting the DVI 
source. 
2.  On the 621R, connect the DVI OUT connector to the DVI acceptor (for 
example, a display), using the DVI cable. 
3.  Remove the module dust covers and connect each duplex LC fiber cable 
one-by-one to each of the four LC receptacles of the 621T and 621R.