Memotec CX900e, Hardware Reference Manual, Page: 99 / 200

9 DUAL ANALOG VOICE I/O CARD
3006M100-002
9-5
9.3.1 FXS
The FXS (Foreign eXchange Station) SLIM LID is used for connection to a
telephone. The FXS SLIM LID provides -48 VDC battery voltage, generates the
ring signal and supports Loop Start detection, Direct Inward Dialing (DID), and
Flash Hook signaling.
9.3.2 FXO
The FXO (Foreign eXchange Office) SLIM LID is used for connection to a
central PSTN office. The FXO SLIM LID supports Loop Start as well as Direct
Inward Dialing (DID) and Flash Hook signaling. The FXO also detects ringing,
and is compatible with -24 or -48 VDC phone interfaces.
Both FXS and FXO SLIM LIDs may be used for direct connections to the PBX.
9.3.3 E&M
The E&M 2/4-wire SLIM LID is used for direct connection to a Private Branch
Exchange (PBX) using either a two-wire or four-wire voice connection. It can be
configured to E&M types I, II, III, IV and V, normal and reverse.
The PBX determines the type of signaling. Figures 9-4 to 9-8 illustrate E&M 4
wire Types I, II, III, IV and V. The same diagrams apply to an E&M 2-wir
interface except that there is no T1-to-T1and R1-to-R1 connection.