IBM 8750 Business Communication System explained

The IBM 8750 Business Communications System was a voice and data switching system PABX, suitable for medium to large numbers of extensions, used on customer premises."^[1] The 8750 was the European version of the IBM 9751,^[2] also a ROLM design.

In 1984, IBM bought the American company ROLM. In 1987 IBM started to market the ROLM-derived IBM 8750 in Austria, Belgium, France, Germany, Italy, Luxemburg, and the UK. Principally for homologation, a few had been installed in IBM locations, such as IBM Havant in England – however none were installed in customer locations.

The 8750 had from 91 to 3000 telephone extensions; up to 1000 simultaneous conversations; a computer based on a Motorola 68020; up to 16 IBM 8755 Operator Consoles; a 30MB fixed disk; main/satellite working with IBM 3750 and 1750 Switching Systems; digital trunks in Belgium, Italy and the UK; and ISDN and Systems Network Architecture (SNA) networks.^[3]

IBM later sold ROLM to Siemens^{[4] [5]} who then continued to market the 8750.

See also

• IBM 1750, 2750 and 3750 Switching Systems

Notes and References

1. Web site: Freshwater. R. IBM 8750. THE TELEPHONE FILE. April 29, 2018.
2. News: Brown. Bob. IBM, Siemans carve up ROLM operations. April 29, 2018. Network World. 51. Dec 19, 1988. 5 .
3. IBM brochure G511-1025-0 dated 10/87; System description GA19-5480 and 20 other manuals
4. Web site: History of ROLM, IBM, and Siemens Enterprise Communications.
5. News: Markoff. John. IBM to sell Rolm to Siemens. The New York Times . 14 December 1988 . April 29, 2018. The New York Times. Dec 14, 1088.