Equitel E451 Instalační manuál stáhnout pdf (Strana 10)

August 2012 – Ed.1.2

EQUITEL – E451 Technical manual

Page 6

1.3 Audio

1.3.1. Loudspeaker output

The audio codec output is connected to an amplifier capable of providing up to 1.1 W over an 8 Ω load.

The loudspeaker is connected at the +6dB gain amplifier output (

in Figure 3), with an impedance of

8Ω and 3W input nominal power.

1.3.2. Microphone input

The audio input is composed by an “electret” type microphone (

in Figure 3) and a +10dB gain

preamplifier.

With this, the signal range that can be captured by the microphone and delivered to the audio codec is

much higher. This provides a higher flexibility when selecting the audio volume.

1.4 User button

This button (

in Figure 4) is associated to one microprocessor input. If configured in the Proprietary Mode,

the unit requests a call to the control center when pressing it. In the case of using the SIP protocol, this

button has a triple functionality: call, answer the call and hang up.

1.5 Status LED

E451 has a visual indicator of the audio communication status:

• When ringing (input or output call): LED blinks.

• Open bidirectional audio channel: LED on.

• Closed audio channel: LED off.

This status LED (

in Figure 4) is placed in the same call button.

1.6 Power supply connector

In the absence of a PoE Ethernet network to power the unit, E451 can be powered with an auxiliary DC power

supply between +9 and +14 volts. It can give a minimum of 5 W and 0.5 mA.

The auxiliary power supply is made through a 2 pins-pole (

in Figure 4).

Pin Signal Description

1 VDC Power (9 .. 14 V)

2 GND Ground

As a protection measure, the unit has an internal 2.5A rearming fuse.

When the unit is correctly powered, the ON indicator (

in Figure 4) should flash.

1.7 Reset button

It may be necessary to reset the unit in case of wrong functioning. If so, simply press the reset button (

Figure 4). Its associated LED is marked as

in the Figure 4.

Furthermore, it is possible to remotely reset the unit through the web (see Chapter 5.8 ).

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Equitel E451 Instalační manuál Strana 10