Command Reference Guide

3Com Router 5000 Family and Router 6000 Family em-phy-parm ● 149
Command Reference
em-phy-parm
Purpose Use the em-phy-parm command to configure a wire scheme for the analog E&M
subscriber-line.
Use the
undo em-phy-parm command to cancel an existing wire selection
scheme.
Syntax em-phy-parm { 2-wire | 4-wire }
undo em-phy-parm { 2-wire | 4-wire }
Parameters 2-wire
Choose the 2-wire analog E&M wire scheme.
4-wire
Choose the 4-wire analog E&M wire scheme.
Default By default, the 4-wire analog E&M wire scheme is selected.
Example Choose the 4-wire scheme for the analog E&M subscriber-line.
[Router-voice-line1/0/0] em-phy-parm 4-wire
View This command can be used in the following views:
■ Voice Subscriber-Line view
Description This command is only applicable to analog E&M subscriber-line.
When analog E&M is used in PBX communication, its voice uses two or four wires,
plus two or four signaling wires. So, a 4-wire analog E&M actually has at least six
wires. 2-wire mode provides full-duplex voice transmission, in which voice is
transmitted between two wires in both directions. 4-wire mode resembles the simplex
mode. Every two wires are responsible for voice transmission in one direction.
This command is used for the wire match between the voice router and remote end
equipment connected with it.It has influence on voice transmission only and has
nothing to do with signaling.