CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 53)

2240 Fiber Optic Modem
53
4.4.5 SCT Switch
This slide switch selects whether the SCT leads are outputs (OUT position) or
inputs (IN position). The OUT position makes the 2240 "pure-DCE" and RD data
is shifted out in sync with the 2240-supplied SCR clock. The IN position makes
the SCT leads inputs and the 2240 will shift RD out in sync with the customer-
supplied clock on the SCT leads if the main board XTCLK (W26) jumper is ON.
Refer to Section 2.2.6 on the use of the XTCLK jumper.
Factory Setting = OUT
4.4.6 CTS_GATE Jumper
NOTE: This jumper is functional only when the CTS_OUT jumper is
in the CTS position.
Then, 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
4.4.7 CTS_OUT Jumper
This jumper selects the source of the CTS output signal. In the CTS position, CTS
provides the local CTS function (refer to Section 4.4.6, "CTS_GATE Jumper") In
the RI position, the CTS tracks the state of the DTR input at the far end 2240.
Factory Setting = CTS