User's Manual

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DCM000000104
Printed: 03.05.21,10:40
Revision Date:5/21/03
6
LNKFIB-H03 and LNKFIB-H04 Head-End Modules
In the LNKFIB-H03 Head-End Module the
8 Fiber-Optic Pairs are in two Banks (A & B)
of four, with the RF connections combined inside the Module in those groupings. The
LNKFIB-H04 is identical, but with one Bank of 4 removed.
Each of the Groups of four consists of a single RF Input feeding a single Laser
Transmitter split optically to four Fiber-Optic Outputs. The four matching Fiber-Optic
Inputs each go to their own Photodiode Receiver, followed by a 0 to -15dB digitally
controlled attenuator providing Uplink Gain Control. The RF signals from the four
digital attenuators are combined into a single RF Output.
The Group-of-Four RF Input and Output combining inside the Module alleviates the
need for external combining / splitting.
Block Diagrams
SM F.O. In
SM F.O. Out
(PI N Diodes)
(Lasers)
Power Supply
120 / 240 VAC
120/240 VAC
PreAmp
L aser Dio de
Photodetectors & PreAmps
RF O ut "A"
RF Input "A"
SM F.O. In
SM F.O. Out
(PI N Diodes)
(Lasers)
PreAmp
L aser Dio de
Photodetectors & PreAmps
RF O ut "A"
RF Input "A"
With UpLink Gain Control
With UpLink Gain Control
Micro-Controller
Circuitry
CAN Interface
RS232 Interface
To Head-End
To PC
Green P ower On LED
Red Fault LED
Fault Relay