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2.5
INTERFACE WIRING
Tables 7, 8, 9 and 10 list the interface wiring for Model F270X FOM II Series Modems. The RJ11 (J4)
is used with a single line 2-wire telephone. Wiring for (J4) is shown in Table 7. The modular connector (J3) is
wired in parallel with the 12-pin connector (P1) for power. When installing the telephone Modem in a
standalone or dual-card rack mount chassis, a power transformer is plugged into modular jack (J3). When
installing the telephone Modem in a 20-card rack mount chassis (HF-20) with optional power supplies
(AC150W) the 12-pin connector (P1) is used. Wiring for the 12-pin connector is shown in Table 7. RJ45 (J5)
is used for RS-485 or RS-422 data transmission. Wiring for J5 is shown in Table 9. RJ11 (J6) is used in
applications where data, audio or both are meant to transmit on a copper, instead of fiber optic network.
Settings for the copper interface are previously explained in section 2.3.3. Wiring for the copper interface is
shown in Table 10. Figure 1.5 identifies the locations for RJ11 jack (J4), 12-pin power connector (P1),
modular power jack (J3), RJ45 (J5) and RJ11 (J6) jacks.
Pin Number
Signal Designation
Color
1
Not Used
2
Not Used
3
Ring
Green
4
Tip
Red
5
Not Used
6
Not Used
TABLE 6: (J4) TELEPHONE / ANALOG WIRING
Pin Number
Signal Designation
1
+12 VDC
2
+12 VDC
3
Signal Ground
4
Signal Ground
5
Signal Ground
6
Frame Ground (Chassis)
7
System Alarm Interface
8
Signal Ground
9
Signal Ground
10
+12 VDC
11
+12 VDC
12
+12 VDC
TABLE 7: (P1) CHASSIS POWER / ALARM WIRING
