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This is Nanhua Electronics' new generation industrial intercom system product. For environments that need independent communication networks, or have heavy EMI, such as ports, ships, power and chemical plants, steel mills, offshore platforms, cranes, tunnels and coalmines.

DSP high speed data processing and voice compressing coding techniques help solve voice quality problems caused electro-magnetic interference, environment noise, cable distance and multiple phone stations.

DT digital broadcasting intercom’s power supply and communication share the same 2-wire cable.  Non-polarity cable connection type, uses central power supply, plug and play, commissioning free, no expertise needed on installation & after-service. All those features can significantly reduce cabling material and installation cost.

Specifications

Description	Parameter
Audio format	Lineal PCM
Audio input threshold voltage	15dB (power supply voltage, reduce environment interference), auto switching off audio input if the audio input is lower than this threshold voltage in 2 minutes after unhook, and will go to sleeping mode automatically
Carrier format	OFDM
Ambient temperature	-30℃ - +70℃
Relative humidity	10% - 90% no condensation
Working voltage	24VDC ± 10%
Power supply	Central power supply from power supply box
-	Main power supply 110V AC±10% or 220V AC±10%
-	Back up power supply 24VDC / 7AH
-	Main and back up power supply switching time < 500ms
Communication distance	800 meters
System netting numbers	Max 20 stations (with external power supplies)
Running mode	Long-term

Functions & Features

• Any phone station can broadcast to entire site, which makes locating personnel or broadcasting announcements convenient and easy.
• System supports 3 party and multi-party communication; priority call control.
• Adopt digital processing technology, loss-free data compressing, no loss of voice quality, provides loud & crisp voice quality.  Suitable for the harshest environments and ideal for industrial application.
• Support point-point, cascade and spreading networking.
• Advanced interference immunity technology reduces EMC & EMI.
• "Auto off" function sends station into power save mode after 2 minutes without audio input.
• Auto power adjustment, auto temperature compensation, auto recovery, over load protection, auto mute.
• Adjustable broadcasting volume.
• LED working status indication.
• ABS housing, indoor station incorporate phone and speaker into all-in-one design.

Operation Method

• Unhook
  Remove handset from station, green LED indicator on front panel will turn on to indicate a call is in progress.
• Broadcasting:When handset if off hook, push button on the handset; a yellow LED indicator on front panel will turn on.
  1. Speak into the handset microphone, all remote loudspeakers at each station will broadcast the spoken content.
  2. Release the button on the handset when finished speaking; yellow LED light will turn off when broadcast is complete.
  3. After hanging up the handset, green LED indicator will turn off.
• Talk:
  1. After broadcasting, do not hang up.
  2. Pick up handset from any station within the system.
  3. When line is connected, communication can begin.
• Hang-up
  Hang up the handset; green LED indicator will turn off.