Cisco MC3810-APM-FXO= Datasheet download pdf (Page 4)

Configuring Voice Ports

Voice Port Configuration Overview

VC-38

Cisco IOS Voice, Video, and Fax Configuration Guide

Figure 13 FXS Signaling Interfaces

Figure 14 FXS and FXO Signaling Interfaces

Figure 15 E&M Signaling Interfaces

FXS and FXO Interfaces

An FXS interface connects the router or access server to end-user equipment such as telephones, fax

machines, or modems. The FXS interface supplies ring, voltage, and dial tone to the station and includes an

RJ-11 connector for basic telephone equipment, keysets, and PBXs.

An FXO interface is used for trunk, or tie line, connections to a PSTN CO or to a PBX that does not

support E&M signaling (when local telecommunications authority permits). This interface is of value

for off-premise station applications. A standard RJ-11 modular telephone cable connects the FXO voice

interface card to the PSTN or PBX through a telephone wall outlet.

FXO and FXS interfaces indicate on-hook or off-hook status and the seizure of telephone lines by one

of two access signaling methods: loop start or ground start. The type of access signaling is determined

by the type of service from the CO; standard home telephone lines use loop start, but business telephones

can order ground start lines instead.

Voice port

1/0/0

FXS FXS

37757

Serial or

Ethernet port

Serial or

Ethernet port

Voice port

1/0/0

WAN

Voice port

1/0/0

FXS FXO

37758

Serial or

Ethernet port

Serial or

Ethernet port

Voice port

1/0/0

WAN

PSTN

Voice port

1/0/0

PBX PBX

E&M E&M

37759

Serial or

Ethernet port

Serial or

Ethernet port

Voice port

1/0/0

WAN

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