Telephone Test and Interface Equipment

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Rugged construction. Time Tested.

Designed specifically for installing, testing and monitoring Nortel’s DMS-100 EBS Centrex switches and analog lines, our telephone test and interface equipment marked DPL’s entry into the telecom industry.* Born from our research and development department, its rugged construction and wide industry adoption, became the benchmark for future product development and laid the foundation for DPL’s rapid growth.

With 30+ years in the telecom industry, our telephone test and interface equipment continues to meet the needs of telecommunications companies, service providers, and RBOCs across the globe.  


*Limited inventory remaining. All products manufacturer discontinued (MD). Effective discontinuation dates as follows: CPI-101 - 09/2013; SBI-145 - 09/2014; TTS-100 - 09/2008


SBI-145 Telephone Butt Set

The SBI-145 is a state of the art craftperson's test set intended for purchase by network providers as a tool to facilitate installing, diagnosing and testing POTS and MDC telephone lines.

Light and self-contained the SBI-145 has three modes for dialing:

  • Pulse Dial (PD)
  • Touch Tone (DTMF)
  • Meridian Digital Centrex (MDC® or EBS)

The MDC mode is for use on DMS-10®, DMS-100® (MDC) central office switches as well as on all M5000 series lines. The SBI-145 does not work on ISDN or other fully digital lines.

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CPI - 101 Computer-to-P-Phone Interface

The CPI-101 interfaces a Northern Telecom DMS-100 Centrex Electronic Business Service (EBS) telephone line to a computer’s UART serial port. It allows complete computer control of an EBS line allowing the computer to:

  • Validate incoming caller ID (CLID)
  • Answer calls
  • Receive touch tone digits (DTMF)
  • Transfer/conference a call
  • Monitor feature key status
  • Simulate the pressing of any P-Phone key

The computer can originate and answer telephone calls using the CPI-101, which is designed to operate on an EBS / MDC P-Phone line with an EBS telephone on the same line. The CPI-101 does not come with software. 

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TTS-100 Telephone Test System

The TTS-100 is a telephone test system used in the refurbishing of telephones, or to verify telephone functionality and works on DMS-100® (EBS) telephones as well as all analog telephones.

The TTS-100 come with its own software installation CD and can operate under a MS-DOS® or Windows® DOS Prompt. The software includes an extensive “Help” section and enables the ability to:

  • Customize POTS phone test sequences and menus
  • Operate in automatic or semi-automatic test modes
  • Report on number of phones tested each day by type

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