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1.5 Internal Description 
 
 
 
 
 
Figure 3 - Microflex – Internal description 
 
All connections to the Microflex including power, video, data and audio cabling are 
made via pluggable industrial terminals.  The signal description for each terminal is 
indicated on a cabling label inside the enclosure.   
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Care must be taken not to mix a Microflex FXS interface and FXO interface when 
connecting the audio signals.  Connecting a telephone line (FXO) instead of telephone 
set can damage the FXS sub-module.  A label at the back of the enclosure indicates the 
audio option selected (O for FXO, S for FXS and L for line level). 
 
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The industrial terminals are mounted on an interconnection board.  This removable 
board integrates a two stage surge/lightning protection circuit providing industrial 
type protection for the main electronics.   
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Each surge or lightning strike weakens the protection circuitry.  It is recommended in 
lightning prone geographical areas and as part of a maintenance program, to replace the 
protection board every 2 years.  Please contact ComLink factory for part number and 
ordering procedure.   
 
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The interconnection board connects to the main Microflex board via a pluggable 
ribbon type cable assembly.  If this ribbon needs to be disconnected for 
 
Main Board 
Protection 
Board 
 Status (DS1) 
Power (DS2) 
Comms 
(DS3) 
Phone 
line (D1) 
Carrier 
Detect-
CD (D2)
Interconnection 
blocks
Reset Switch 2 
(SW2) 
Reset Switch 1 
(SW1) 
Reset Switch 3 
(SW3) 
Video Codec 
Board