CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 69)

2240 Fiber Optic Modem
69
The previous V.35 interface Model MC2 / 435, did not conform to the ISO 2593
pinout and was the predecessor to the MC2 / 436 interface. The MC2 / 436 went
into production during mid-summer 1996. The signals listed in Table 4-L have
different pinouts on the MC2 / 435 versus the MC2 / 436. The MC2 / 435 also did
not support the Extra Clock for the receive data signal. This pinout difference
table is only included as a reference. MC2 / 436 interfaces can be identified by
the addition of a heatsink on the voltage regulator, VR1.
Table 4-L.
Pinout
Differences
(MC2 / 435 vs.
MC2 / 436)
4.6.2.1.1 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 ON (asserted).
Factory Setting = OFF
Function Pin CCITT Direction
(A/B) Circuit Number
Test Mode C C 142 from modem
Local Loopback E E 141 to modem
Remote Loopback D D 140 to modem