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Analog Voice Modules Passport 4400 Hardware Installation Manual
8-5
Interface Modules
FXS and FXO Interface Modules
Except for the type designation, the FXS and FXO interface modules have
identical telephone interface connectors on the back panel. Each consists of an
RJ11 modular jack labeled FXS or FXO and a 4-pin terminal block; see Figure 8-
6, “FXS and FXO Interface Modules.” Both are shielded by a protective cover.
Their schematic equivalents are shown in Figure 8-6, “FXS and FXO Interface
Modules.”
The terminal block is fitted with a female plug. Individual cable leads are
connected to this plug to form a telephone interface cable.
Figure 8-6. FXS and FXO Interface Modules
Terminal
Block
1
2
3
4
1
2
3
4
Tip (T)
Ring (R)
Signal Ground (SG)
Terminal
Block
FXS or FXO
RJ11
*Must not be connected
RJ11
1
Tip (T)
Ring (R)
1
Pin 3 Not Connected
Pins 1, 4 Not Connected
*