User manual

19
2270 Fiber Optic Modem
Figure 2-2.
2201 Rack Chassis
Front View
with Modems
Installed
Table 2-A. Operating Mode Selections
Internal DIP Switches
SCT Polarity (C) Closed (O) Open
Jumper 4 5 6 Operating Mode
NORM C O O External Clock Mode (SCT suppressed)
NORM O C X Slave Clock Mode (SCT=Receive Clock)
X=DIP switch position 6 is dont care
INV O C X Slave Clock Mode (SCT=Receive Clock Inverted)
NORM C C X Slave Clock Mode (SCT returned on Ext Clk leads)
NORM O O C Internal Clock Mode Mode (SCT=Internal Clock)
INV O O C Internal Clock Mode Mode (SCT=Internal Clock Inverted)
DIP switch position 5 must be Open
NORM C O C Internal Clock Mode Mode (SCT returned on Ext Clk leads)