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October 2013 – Ed.1.0

EQUITEL E400 Family – Control and communications protocol

Page 2

On the left side of the figure it is shown an IP intercom network using E401 OEM boards. Some minimum

elements must be added to build, for example, an intercom with it.

(1)

On the right side we have depicted an intercom network with E451 units.

Regarding the communications, each one of the modules E401 and E451 is an Ethernet device that publishes

a different IP address. This way, at a software level, there is no distinction between E401 and the intercom

E451.

The control and supervision of the modules, the communications establishment and the vocal transmission

are made through the Ethernet/IP network, each E401 or E451 being considered as a different access point

(IP address + port).

In order to do that, we use some protocols that are standard in some cases or proprietary of EQUITEL in

others, and that have been specifically designed for this application.

This document describes the control, supervision and communication process with EQUITEL E400 modules

from the communication system point of view. We stress especially all the aspects relating to the proprietary

protocol mentioned above.

As an example of use of the communications and control system, EQUITEL has developed a demo application

to control several E401 or E451 and to send the audio from a computer.

1.2 VoIP technology: a brief description

VoIP technology encompasses several international standards regulating the audio transmission over IP

networks.

A VoIP based telephony system can be highly complex but the basic operating theory is simple.

In this paragraph we will give a short description of the basis in which this technology is founded on. Our aim

is to provide a better understanding of the use we have given in our IP intercom system.

We are going to put a very simple example that will explain all the necessary concepts when using this

technology in the systems object of this paper.

Figure 2. Minimum necessary elements for a VoIP network

In the Figure 2 it is represented the most basic IP telephone network, consisting of three elements: two

telephones and a PBX. Next we are going to describe the steps to take till a vocal communication between

two telephones can be established.

Step 1: Register

At the most basic level, the PBX keeps a list with the IP telephones existing in the network and offers the

capability of putting them in contact.

Each telephone must be registered with the PBX and it must refresh this register periodically so that the

(1) For a more detailed description of this system, please check specific documentation for E401, “E401 user manual”.

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Equitel E451 Bedienungsanleitung Seite 5