CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 44)

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Canoga Perkins
4.2.1 RTS_BIAS Jumper
The RTS_BIAS jumper controls the state that RTS floats to when there is no signal
driving the RTS pin. The OFF position forces this signal to the OFF (negated) state
when the interface cable is disconnected. The ON position forces it to the ON
(asserted) state.
Factory Setting = OFF
4.2.2 DCD Jumper
The DCD Jumper determines the source of the DCD output. In the CTRL position,
the DCE 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
4.2.3 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