AP-E&M4 4-Port E&M VoIP Card (AP2620 and others)
AP-N1-E&M4 4-Port E&M VoIP Card (AP2620G, AP1800 and others)
E&M Interface Type
2-Wire E&M Interface (RJ45)
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 (Type IV is not supported on AddPac IP-PBX/gateways).
SB (Signal Battery) - Used on E&M Types II, III, IV (Type IV is not supported on AddPac IP-PBX/gateways)
T / R (Tip/Ring) - T / R leads carry audio between the signaling unit and the trunking circuit. On a 2-wire audio operation circuit, this pair carries the full-duplex audio path.
T1/R1 (Tip-1/Ring-1) - Used on 4-wire audio operation circuits only. The 4-wire implementation provides separate paths for receiving and sending audio signals .
4-Wire E&M Interface (RJ45)
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 (Type IV is not supported on AddPac IP-PBX/gateways).
SB (Signal Battery) - Used on E&M Types II, III, IV (Type IV is not supported on AddPac IP-PBX/gateways)
T / R (Tip/Ring) - T / R leads carry audio between the signaling unit and the trunking circuit. On a 2-wire audio operation circuit, this pair carries the full-duplex audio path.
T1/R1 (Tip-1/Ring-1) - Used on 4-wire audio operation circuits only. The 4-wire implementation provides separate paths for receiving and sending audio signals .
E&M Type I
E&M Type II
E&M Type III
E&M Type IV
E&M Type V
Select E&M Card Type
Wing Start
Delay Dial
CLI for precise E&M timing settings (red) :
Router(config-voice-port-0/0)# timing
clear-down-delay set clear down tone detect delay time (FXO)
delay-duration set delay-duration time (EnM)
delay-start set the appropriate timing
dialout-delay set dialout-delay time (EnM)
fxs-linelock-duration set fxs-linelock-duration time (FXS)
fxs-powerdown-duration set fxs-powerdown-duration time (FXS)
fxs-reorder-duration set fxs-reorder-duration time (FXS)
hookflash-out set hookflash out time (FXO)
wait-wink set wait-wink time (EnM)
wink-duration set wink-duration time (EnM)
wink-wait set wink-wait time (EnM)
Default E&M Timing Setting Value:
E&M Trunk Mode CLI Settings (Example)
Network configuration diagram (e.g., Air Traffic Control)
E&M Installation Guide Demo. Youtube :
E&M Interface Application Note :
1. E&M to Digital E1 Converter Function
Equipment Configuration: 4-Port E&M VoIP Card + Digital E1 VoIP Card
2. E&M Trunk Mode
Network configuration diagram (e.g., Air Traffic Control)
E&M Broadcasting VoIP Gateway Network Configuration Demo YouTube :
AP2620 E&M to E&M One-on-One Broadcasting (E&M VoIP broadcasting service for public announcement) Demo Configuration
- Hybrid IP Switch IPNext180 (4-port E&M card)
- AP-IP300 SIP broadcast telephone (gooseneck microphone or handset broadcast)
- AP2620(E&M) 4-Port E&M Card, AP2620(E&M) 4-Port E&M Card: 1-to-1 Optical Cable Long-Distance Communication Line ((IP/MPLS)
- AP2620(E&M) 4-Port E&M Card + AP2620 (1 Port 3.5mm Audio In/Out + 3 Ports FXS) Card
- AP620 120W High Impedance (100V) Amplifier
- 30W High Impedance (100V) Analog Horn Speaker
4. Advanced E&M Hunt Group Function
Generally, the Hunt Group function of an E&M Gateway transfers calls to the next line when one E&M line is busy. However, if a line is disconnected or fails, calls cannot be transferred to the next line and remain stuck on the faulty line. We have developed new firmware for the AddPac E&M Gateway to support a feature that allows calls to bypass the faulty line and proceed to the next line in such situations.
Software block diagram
5. 4-Wire, 2-Wire E&M VoIP Gateway Solution (8-Port), Radio VCCS for E&M-based Radio Communication VoIP Dedicated Line Communication
Network Diagram (Legacy E&M Type)
Functional Block Diagram (IP Type)
6. Support for E&M-based hotline VoIP services
The AP2620 is an enterprise VoIP gateway that can be configured with up to 8 ports of FXS, FXO, and E&M analog voice channels, or digital E1 or digital T1 VoIP access channels. Supporting hot-line-based emergency calls, it provides stable Voice over IP services. The AP2620's attractive price relative to its features makes it an excellent choice for customers who have been hesitating to join the wave of IP telephony. In particular, for users requiring emergency calls, such as those using elevator emergency call devices, it supports a Hot-Line function between FXS and FXO ports, allowing for immediate dialing to a pre-configured number simply by pressing a button or lifting the handset.
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