Rs_Bias Jumper; Rr Jumper; Cs_Gate Jumper - Canoga Perkins 2240 User Manual

2240 Fiber Optic Modem

4.6.1.1.1 RS_BIAS Jumper

The RS_BIAS jumper controls the state that RS floats to when there is no signal driv-
ing the RS pin. The OFF position forces this signal to the OFF (negated) state when the
interface cable is disconnected. The ON position forces it to ON (asserted).
Factory Setting = OFF

4.6.1.1.2 RR Jumper

The RR jumper determines the source of the RR output. In the CTRL position, the
RR output functions as the output for the RS input at the far end. In the CD jumper
position, the RR output 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
when the far end RTS 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 = CTRL

4.6.1.1.3 CS_GATE Jumper

The CS_GATE jumper controls the state of CS when the local RS is ON. When the
jumper is in the ON position, CTS follows RS only. The CD position allows the
2240's standard data interface signal CD to gate CS. In the CD jumper position and
with local RS ON, CS will turn ON either when the modem's fiber optic receiver is
in sync (main board internal switch S1 CD / DCD = OFF and CD / SYNC = ON) or
the RTS signal at the far end is ON (main board 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
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