AP1800 4 Port E&M VoIP Gateway, Up to 8 Port E&M VoIP Gateway (2 x 4 Port E&M Card : Hot-Swap), E&M Converter, SIP E&M Converter

 

AP1800 VoIP gateway supports maximum 16 port of analog voice interface. AP1800 supports dual module slots for analog VoIP cards like as 8 port FXS card, 8 port FXO card and 4 port E&M card.

Especially, 4 port E&M module is designed to support uninterrupted VoIP service by providing hot-swap function by installing and removing E&M module while power is applied. New AP-N1-E&M4 4-Port E&M VoIP Module supports various E&M Types like as E&M Type I, II, III, V. 

AP1800 VoIP gateway supports two Fast Ethernet port and RS232C console interface which is the base for delivering various network services. Also, it provides LEDs on the front panel indicating operational status, line status, and LAN Interface status of gateway.

In addition, AP1800 provides concurrent dual stack such as H323, SIP and QoS (Quality of Service) for high quality VoIP communication service.

APOS(AddPac Operating System) Command Line Interface operation demo. Youtube.

 AP-N1-E&M4  4-Port E&M VoIP Module E&M Type Introduction.

First, E&M Type I

Type I is the most common standard type in North America and Japan, etc. An outgoing call to the signaling unit with Battery on the M lead. Incoming calls are signaled by an Earth signal on the E lead.

Second, E&M Type II

The Type II interface requires no common ground; instead, each of the two signals has its own return. For the E signal, the tie line equipment permits current to flow from the PBX; the current returns to the PBX's ground reference. Similarly, the PBX closes a path for current to generate the M signal to the tie line equipment.

Third, E&M Type III

A variation of Type II, Type III use the SG lead to provide common ground. With this configuration, the PBX drops the M signal by grounding it, rather than by opening a current loop.

Fourth, E&M Type V

Type V is a simplified version of Type IV. This is also a symmetric interface using only two wires. Type V requires a common ground between the PBX and the tie line equipment; this is provided via the SG leads.

E&M Type Selection