Intercom Communications (UK) Ltd

Ring-Master CB901

“The Ring-Master CB901 was an all-to-all direct speech system (replaced by the AlphaCom System) Controlled by a fully electronic central exchange”

Ring-Master CB901


Ring-Master CB901 Description

The Ring-Master CB901 was an all-to-all direct speech system (replaced by the AlphaCom System) Controlled by a fully electronic central exchange. The brain of the system was a 16-bits microprocessor offering the user a wide selection of programmable features, designed to achieve flexibility and optimal efficiency in internal communication. The system configuration (numbering plan etc) as well as all features are simply programmed by using a data terminal or PC.



The Ring-Master CB901 system is divided into 4 categories on the number capacity:

  • Single-Stage System CB901-1; up to maximum 240 subscribers
  • Double-Stage system CB901-2; above 240 and up to 480 subscribers
  • Triple-Stage system CB901-3; above 480 and up to 717 subscribers
  • Multi-Stage system CB901-M; above 717 and up to 7170 subscribers

Station Types

Station types

The CB901 was used and is still used in many applications around the world in: Banking, Hospitals, Govermant Buildings, Military, and education.
The Ring-Master CB901 has been replaced by the AlphaCom range of exchanges. Please visit Alphacom

CB901 stations include the following types :- AA916, AA903, AA905, AB931, AB933, AB931A, AB933A, AA906, AA912, AA961, RC104, BC934, AA960, AE111.



Here at RingUK we have a considered approach to Specifying Intercom Systems, based on methodically detailing every aspect of each client’s needs. It is then and only then that we are accurately able to design an intercom system that fulfills the exact specifications of the client.

Over the years Specifying Intercom Systems this exacting approach has enabled us to develop a solid aggregate understanding of each sector whose intercom requirements we deal with. In drawing upon this we are able to quickly develop a blueprint that we then tailor to the specifics of each client’s brief. The efficacy of this procedure means we are very rarely unable to overcome unforeseen problems – if ever.

You cannot buy experience, and it’s our experience in Specifying Intercom Systems that makes us great at adapting and thinking laterally to devise the best intercom solution for our clients. This often means taking a standard intercom system and integrating it with specialized design features to create a setup that is equal in its uniqueness to the exacting needs of the client.

This is all part of an overall standard of service that we feel is unavailable elsewhere within our industry. We place a premium on total customer satisfaction, which is why we are always looking to extend and improve our product range, and to maximize value. Our position within the industry in terms of our size, reputation and our relationship with suppliers means we are able to cut costs without cutting corners.

With many years of experience in the broadcast and communications industry, RingUK have built  up an impressive portfolio of products and knowledge from leading  manufacturers.

Distributor, Partner & Resellers For:

RingUK specialises in assisting buyers, specifiers and end-users in the process of recommending and purchasing specialist communications equipment for various commercial applications including:


Our specialist communications advice team has over 25 years of experience, specifying and commissioning communications systems that meet the objectives of our clients. Our service centres on enabling our clients with the information necessary to make an informed decision when investing in suitable communications equipment.

For more information

    Contact intercom specialists Ring UK today for professional advice about which system you should go for. We will assess your requirements and research and explain all the options available to you to help you or your client choose a perfect Intercom system that meets your needs.

Contact us via our Intercom Enquiry Form


Please Share Our Content
Share on LinkedIn
Tweet about this on Twitter
Share on Facebook
Print this page
Email this to someone