H3C Technologies H3C MSR 5600 - Manual (Page 11)

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Configuring analog voice interfaces
Analog voice interfaces include FXS, FXO, and E&M interfaces.
FXS interface
A Foreign Exchange Station (FXS) interface connects to a standard telephone, fax machine, or a Private
Branch Exchange (PBX) through an RJ-11 connector and a telephone cable. It provides ring, voltage, and
dial tone based on level changes on the Tip/Ring line. An FXS interface can only connect to an FXO
interface.
FXO interface
A foreign exchange office (FXO) interface connects to a PBX through an RJ-11 connector and a telephone
cable. It provides ring, voltage, and dial tone based on level changes on the Tip/Ring line. An FXO
interface can only connect to an FXS interface.
E&M interface
An ear & mouth or receive & transmit (E&M) interface is a common trunk line that connects to a PBX
through an RJ-48 connector. The E&M interface supports E&M signaling. The E signaling receives signals
from the peer, and the M signaling sends signals to the peer. An E&M interface can only connect to an
E&M interface.
Configuration task list
Tasks at a glance
(Optional.) Configuring basic functions
(Optional.) Configuring call progress tones
(Optional.) Configuring an FXS interface
• Configuring CID
• Setting the electrical impedance
• Configuring the packet loss compensation mode
• Configuring an FXS interface to send LCFO signals