Grass Valley 8939FCA - Manual (Page 20)

20 8939FCA/FCB — Instruction Manual
8939FCA and 8939FCB Applications
CWDM 16 Channel Configuration
The 8943CF and 8943FC 4 Channel Converter modules can also be used
with two 8939FCA and two 8939FCB modules to provide 16 channels of
video over a single fiber connection.
As shown in the simple block diagram in Figure 8 on page 21 , the two
8939FCB module COM ports can be connected to the corresponding
8939FCA module EXP ports to provide another eight channels of video, for
a total of 16 channels over one fiber.
Multiplexing 8939FCA/FCB
The multiplexing 8939FCA is fed signals from two 8943CF modules with
fiber optic SFP devices with frequencies pairs from 1470nm to 1610nm
(CH1 – CH8).
The multiplexing 8939FCB is fed signals in a similar manner as the
8939FCA from two 8943CF module with fiber optic SFP devices with fre-
quencies pairs from 1310nm to 1450nm (CH9 – CH16).
The multiplexing 8939FCB COM port is then connected to the EXP port of
the multiplexing 8939FCA allowing the 16 channels to be sent out the COM
port of the 8939FCA over fiber to the demultiplexing 8939FCA COM port.
Demultiplexing 8939FCA/FCB
The demultiplexing 8939FCA COM port accepts the 16 channels over a
single fiber. The 8939FCA EXP port is connected to the COM port of the
demultiplexing 8939FCB allowing the 16 channels of fiber to be separated
by the optical filtering in both modules and sent to the corresponding fre-
quency output ports on the 8939FCA and 8939FCB.
These fiber outputs are connected to four 8943FC 4 Channel Fiber to Elec-
trical modules each with two CWDM fiber receiver SFP devices installed
that will accept bit rates of 1270nm to 1610nm.
The 8939FCA/FCB outputs must be cabled to the fiber inputs on the
8943FC modules so that all electrical output channels match the electrical
input channels. The 8943FC modules make the original electrical inputs
available on the electrical outputs of the module.