Thursday, April 22, 2010

Interface Standards for PBX Systems

In order to extend a PBX system or to integrate it with other devices, such as a public network, requires the use of an interface standard. An interface standard is a physical method of integrating a phone system with another system for the purpose of expansion, data exchange and data collection.

The following standards are used to connect an extension to a phone system:
  • DECT (Digital Enhanced Cordless Telecommunications) – is a wireless technology that was adopted for use on cordless phones.
  • POTS (Plain Old Telephone Service) – has been around since the advent of the public telephone system. A basic connection service for residential and commercial users.
To interface two or more PBX phone systems requires the following standards:
  • DPNSS (Digital Private Network Signaling System) – a network protocol defined by the British Telecom.
  • PRI (Primary Rate Interface) – a standard based on the T-Carrier line that provides telecommunication services for businesses.
  • QSIG – a protocol, developed by Ecma International, designed for corporate or enterprise integrated voice and services networks.
PBX and trunk lines can be connected by using:
  • ISDN (Integrated Services Digital Network) – enables an ordinary phone the ability to have digital transmissions.
  • RBS (Robbed-Bit Signaling) – developed by AT & T in transitioning from analog to digital trunks.
Standards for enabling data collection over a PBX system:
  • File – the most simple standard wherein a PBX generate a file containing the data collected.
  • Network Port – utilizes a port, application or buffer in order for the PBX to send an information.
  • Serial Interface – enables data to be sent one bit a time over a communication channel. 

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