AudioCodes Mediant 800 MSBG - Enm

CLI Reference Guide 5. VoIP Commands
Version 6.4 61 January 2012
5.1.4 enm
E and M (earth and magneto, or ear and mouth) is a type of supervisory line signaling that
uses DC signals on separate leads, called the "E" lead and "M" lead, traditionally used in
the telecommunications industry between telephone switches.
Conventions
E and M Interface Supervision Signal Description
E (Ear or Earth) - Signal wire from trunking (CO) side to signaling side.
M (Mouth or Magnet) - Signal wire from signaling side to trunking (CO) side.
SG (Signal Ground) - Used on E & M Types II, III, IV.
SB (Signal Battery) - Used on E & M Types II, III, IV.
T/R (Tip/Ring) - T / R leads carry audio between the signaling unit and the trunking circuit.
On a two-wire audio operation circuit, this pair carries the full-duplex audio path.
T1/R1 (Tip-1/Ring-1) - Used on four-wire audio operation circuits only. The four-wire
implementation provides separate paths to receive and send audio signals.
E & M signaling defines a trunk circuit side and a signaling unit side for each connection
similar to the data circuit-terminating equipment (DCE) and data terminal equipment (DTE)
reference type. Usually the PBX is the trunk circuit side and the Telco, CO, channel-bank.
The AudioCodes analog E and M interface functions both as the signaling or trunking unit
circuit.
Hook Events Detection and Generation - AudioCodes support only the LMR type for
hook signaling.
Syntax:
The syntax of this command includes the following variations:
interface enm
set <parameter> <value>
Arguments Description
<parameter> <value> Sets the following table parameters:
 country_coefficients - Sets port physical line impedance
 defaults - Sets all parameters to default values
 hook_debounce - Sets hook state debounce timer, to protect
from false hook events.
 hook_glare_enable - Returns busy while PTT hook is off and
user would like to force off hook towards the PTT itself.
 port_rx_gain - Sets E and M port external RX gain (not
supported in this version)
 port_tx_gain - Sets E and M port external TX gain (not
supported in this version)
 signaling_type - Configures the E and M signaling interface.
 system_interface - Configures the E and M system interface
 voice_type -
Configures the E and M voice interface
For a description of these parameters, refer to the User's Manual.
Command Modes
Enable