Dsr Jumper; Ch_Gnd Jumper - Canoga Perkins 2240 User Manual

4.5.4 DSR Jumper

The DSR jumper controls the behavior of the DSR signal. The CCITT turns DSR
OFF when the far-end 2240 modem has a local loopback active. The TEST
position causes DSR to turn OFF (negate) whenever any loopback is active at one
or both modems.
Factory Setting = CCITT

4.5.5 CH_GND Jumper

The jumper selects whether chassis ground is connected directly to signal ground
(SHORT position) or through a 100 Ohm resistor (100_OHM position).
NOTE: In the standalone model, the 100_OHM position will only
put a 100 Ohm resistor between the two grounds if the 2240's main
board SIGNAL GND jumper is set to the FLOAT position.
When installed in the 2201 Rack Chassis, any modem main board,
interface or rack chassis jumper being set to SHORT will override
the FLOAT and 100_OHM positions on all of the other modems.
CONSIDER THIS JUMPER CAREFULLY.
Factory Setting = 100_OHM
2240 Fiber Optic Modem
59