Long Line Public Address
 Features & Configuration

Queensgate offers an advanced Digital LLPA system called the LLPA (Long Line Public Address). Example features and components are demonstrated below.


The system is modular and comprises MPU's (microprocessor units consisting of PC's) at each outstation connected by modems controlled by one or more user terminals.

Messages are created in the user terminal, compressed and transmitted to each or all outstations as required. The outstation decompresses and plays through a sound card.

Features (subject to options taken) include digitised speech for low loss, auto alternate path communications, pre-recorded announcement compilation, etc.


With modern advances in Broadband technology, speed, and low costs, it is now the ideal method of connecting computer systems over long distances.

Previous limitations of leased lines and modem connections can be forgotten, but are still available in situations where broadband in not available.

LAN and WAN networks are also very suitable for both LLPA and VoIP services.

LLPA Equipment


Used at outstations and can also
be used as a User Interface.

See the data sheet for full details.

Product Sheet


Used when a WAN/LAN or Internet service is not available.

Expanded View

  • Voice/fax modems are often the most reliable.
  • Most have a low power external power supply.
  • Carrier, Send, Receive indication by red LED.
  • Connection, standard PSTN socket.

ZoneR (Zone Router)

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A ZoneR controller is used in preference to the ZoneC when there is an IP (LAN) connection available.

See the Data Sheet for further information.

ZoneC (Zone Controller)

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A ZoneC controller is used when there is not an IP connection available between the outstation and the control room PC.

See the Data Sheet for further information.


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Microphones are normally supplied with a pre-amp.
See the Data Sheet for further details.

QSL normally supply a small pre-amp that has proved
very efficient and reliable.
See the Data Sheet for further details.

Enlarged View


Images and specifications are typical and particular equipment shown may be replaced by other similar equipment. All specifications subject to options purchased and subject to change. RLLPA is a trademark for the Queensgate Systems component of DLLPA. Note that among other exclusions, amplifiers, outstation microphones and speakers are excluded. QSL Terms apply.