User Manual

Canoga Perkins

4.6.2.1.2 DCD Jumper

The DCD jumper determines the source of the DCD output. In the CTRL position,

the DCD output functions as the output for the RTS input at the far end. In the CD

jumper position and with local RTS ON, CTS will turn ON either when the modem’s

fiber optic receiver is in sync (main PCBA internal switch S1 CD / DCD = OFF and

CD / SYNC = ON) or the state of the RTS signal at the far end (main PCBA internal

switch S1 CD / DCD = ON and CD / SYNC = OFF). Refer to Section 2.2.2.1 for more

information on the internal switch S1 CD / DCD and CD / SYNC positions.

Factory setting = CTRL

4.6.2.1.3 CTS_GATE Jumper

The CTS_GATE jumper controls the state of CTS when the local RTS is ON.

When the jumper is in the ON position, CTS follows RTS only. The CD position

allows the 2240's standard data interface signal CD to gate CTS. In the CD

jumper position and with local RTS ON, CTS will turn ON either when the

modem’s fiber optic receiver is in sync (main PCBA internal switch S1 CD /

DCD = OFF and CD / SYNC = ON) or the RTS signal at the far end is ON (main

PCBA internal switch S1 CD / DCD = ON and CD / SYNC = OFF). Refer to

Section 2.2.2.1 for more information on the internal switch S1 CD / DCD and CD

/ SYNC positions.

Factory setting = ON

4.6.2.1.4 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