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Five Models Offer Optimized Solutions
Powerful Software
Advanced Technology Hardware
A Complete Family of Products


The ROLM 9750 Business Communications System is a highly efficient, computer-controlled voice and data switching system. It enables users to reach many information sources quickly and efficiently while providing cost-effective management of voice and data communications.

The 9750 BCS features a digital voice and data controller, devices to provide voice and data connectivity, and integrated applications - all supported by a wide range of customer support services.

Five Models Offer Optimized Solutions

Five modes of the 9751 CBX are available, each optimized to meet the particular needs and capacity requirements of a given organization.

The Model 10 brings the power and applications of the 9751 CBX to small and medium-size business in a compact, cost-effective package. Up to 100 stations can be supported by a single modular cabinet (single shelf) system. Cabinets two and three each supporting up to 250 stations, can be added in an integrated, stackable fashion to bring the Model 10's capacity to 600 stations. The Model 10 is designed to operate in standard office environments. Release 9005 supports the 9751 CBX Model 10 with all the single-card interfaces and a full range of applications. The Model 10 has the same data connectivity capability as the other 9751 CBX models, is fully data compatible, and with the optional Data Front End Processor II(DFE II), becomes a highly efficient system for voice and data integration.

The Model 20 comes equipped for the immediate use of integrated voice and data. The Model 20 (with the standard high-capacity cabinets) was designed for organizations which require 100 to 720 stations.

The Model 40 uses the standard high-capacity 9751 cabinet to support up to 2,000 stations in a single-node configuration of up to five cabinets. It can be easily customized and arrives on site as a "data ready" system. The Model 40, like all other models of the 9751 CBX, is fully digital except for any basic services which require analog telephones.

The Model 50 adds fault tolerance to the single-node offering for organizations that require an extra level of system availability. The 9751 CBX Model 50 offers common control redundancy on one shelf and full redundancy in the following components: shared electronics, ROLMbus 295E, Advanced Diagnostics Processor, and Data Front End Processor II (DFE II) Cards. Power redundancy is optional.

The Model 70
is a multi-node, fault-tolerant solution for distributed and large installations. The Mode 70 can support more than 20,000 stations in 15 nodes. The Model 70 offers redundancy, like the Model 50, with added redundancy in the hardware supporting the multi-node configuration: the Control Packet Network(CPN, for CPU-to-to-CPU communications) and the internode Links (INLs, the node-to-node links). Power redundancy is optional. Model 70 nodes may be:

  • Co-located: up to 200 feet with right-of-way, connected with twinaxial INLs;
  • Distributed: up to 20,000 feet with right-of-way, connected with fiber-optic INLs;
  • Remote: up to 50 miles, or with no right-of-way, connected using Extended Digital Interties (XDI) over standard T1 facilities.
Powerful Software

Powerful software is the key to providing flexibility and expandability throughout the 9751 CBX product line. Both Release 9004.4 and Release 9005 software offer reliable, applications-rich solutions for your needs. Release 9005 was built on the solid base of the 9004 software.

Advanced Technology Hardware

Al models of the 9751 CBX are built for heavy usages and high reliability. Among the key hardware components are:

The Rolmbus 295E, a high-speed parallel bus whose 295 Mbps of band width per node will easily meet your organization's current and future traffic-carrying requirements. The ROLMbus 295E supports up to 1,045 simultaneous conversations per node.

With Release 9005 single-card interfaces enable denser component packing while improving reliability. Denser packing allows more stations and trunks to be supported in less space, and reduces the operating costs of the system. Single-card interfaces plug into any slot on the universal backplanes.

A high-speed processor, the CPU is introduced with Release 9005 to support a wide range of call handing and applications requirements. Single-node systems support 7,500 to 11,000 busy hour call attempts (BHCA). Multiple-node systems support up to 165,000 BHCA.

A Complete Family of Products

A basic yet crucial requirement of any telecommunications system is to provide flexible, reliable, and easy-to-use station equipment.

The 9750 BCS utilizes the ROLMphone family of digital telephones. All operate off ROLMlink, a proprietary digital protocol which uses a single twisted pair wire to deliver 256 Kbps of voice, data, and control bandwidth to the desktop. All ROLMphones are easily configurable and feature single-button access to CBX features and frequently called numbers, programmable keys, and convenient on -hook dialing.

ROLMphone models include:
  • Rolmphone 120 (single station)
  • ROLMphone 240 Basic (up to 11 stations)
  • ROLMphone 240 (up to 11 stations, speakerphone)
  • ROLMphone 400 (up to 29 stations, speakerphone, display)

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