Connecting The E&M Analog Voice Interfaces; Table 5-2: Rj-45 Connector Pinouts For E&M Interface - AudioCodes Mediant 800 Hardware Installation Manual

Hardware Installation Manual
5.4 Connecting the E&M Analog Voice Interfaces
The device supports up to six E&M ("ear and mouth", "recEive and transMit", or "earth and
magneto") signaling interfaces. E&M is a 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.
This enables the device to be integrated into various applications requiring E&M signaling
interfaces. For example, the device can operate in a radio-over-IP (RoIP) gateway solution
for two-way radio systems. In such a solution, the device interfaces between the analog
radio station (servicing the land mobile radios) and the IP-based push-to-talk (PTT) server.
The device's E&M interfaces support the following:

Dial Type: DTMF touch-tone dialer; pulse dialer

Impedance: 600R and TBR21

Operation: two- or four-wire. 4-wire E&M uses a 4-wire (2-pair) transmission path for
the voice signal. 2-wire E&M uses a single pair for both transmit and receive voice
signal.

Hook Signaling: LMR immediate (without DTMF / MF dialing).

Interface Type V: Type V is the most common variant in use outside United States.
Both ends of the connection indicate a call by grounding the relevant lead. This means
that it is easy to interconnect two PABXs "back-to-back" by crossing over the E&M
leads and transmit and receive pairs.
An RJ-45 cable connector with the following pinouts is used:
Pin
1
2
3
4
5
6
7
8 SG
Version 6.6
Table 5-2: RJ-45 Connector Pinouts for E&M Interface
Name 2W/4W VF
SB
sM (tE)
sR1(tR) 4W
sR (tR1) 2W/4W
sT (tT1) 2W/4W
sT1(tT) 4W
sE (tM)
Description
SB lead
Signaling side M lead, trunk side E lead
Signaling side R1 lead, trunk side R lead
Signaling side R lead, trunk side R1 lead
Signaling side T lead, trunk side T1 lead
Signaling side T1 lead, trunk side T lead
Signaling side E lead, trunk side M lead
SG lead
29
5. Cabling the Device
February 2013