The IBM 3745 is the latest and last of a 37xx family of communications controllers for the IBM mainframe environment. As of mid-2009 there were an estimated 7,000+ of the larger 3745 models still in active production status, down from 20,000 or more in 2007. The 3745 and associated 3746 models were once heavily used within financial, insurance and retail industries as well as within government agencies globally. However, today most organizations have migrated away from the use of 3745s. IBM's Enterprise Extender[1] and the Communication Controller for Linux on System z (CCL)[2] have largely displaced the older 3745s. IBM announced in September 2002 that it would no longer manufacture new 3745s, but IBM continues to support the hardware by providing worldwide maintenance service, by providing microcode releases and by supporting the associated software including NCP (Network Control Program) and the virtual telecommunications access method (VTAM). IBM has announced end-of-service dates for Japan, Europe and the Middle East, but has not yet announced end-of-service for the Americas and parts of Asia.[3]
The latest and most commonly used models of the 3745 are the single Central Control Unit (CCU) 3745-31A and the dual CCU 3745-61A models. These are usually operated in conjunction with the 3746-900 expansion unit (aka 900 frame). The 900 frame provides multiple T1, token ring, V.35 and V.24 attachments on the front end, and connects on the back end to the mainframe host with multiple ESCON serial fiber optic channels. An operator and service interface to the 3745 and 900 frame is provided by an IBM Service Processor which operates under the control of the IBM OS/2 operating system and proprietary code.
^IBM Corporation. "Enterprise Extender". Retrieved 24 April 2017.
^IBM Corporation. "Communication Controller for Linux on System z". Retrieved September 3, 2012.
^IBM Corporation. "Statement of support for 3745 and 3746 Communication Controllers and NCP Software". Retrieved September 1, 2012.
The IBM3745 is the latest and last of a 37xx family of communications controllers for the IBM mainframe environment. As of mid-2009 there were an estimated...
of the IBM3745. The IBM 3720 is unrelated to the similarly numbered IBM 3270 display terminal system. Korzeniowski, Paul (July 20, 1987). "IBM 3720 Cuts...
Expansion unit for IBM 3720 IBM 3724: Controller IBM 3725: Communication Controller IBM 3728: Communication control matrix switch IBM3745: High-speed communication...
372x machines was discontinued in 1989. IBM discontinued support for the 3705, 3720, 3725 in 1999. The 3745, announced in 1988, provides up to eight...
the 3745/3746, features, parts, and service. VTAM is also supported by IBM, as is the NCP required by the 3745/3746 controllers. In 2008 an IBM publication...
every respect a logical superset, or a physical subset of the IBM3745. Whereas the IBM3745 offered one or two physical processors, and one or two physical...
Subsequent versions of NCP were released to run on the IBM 3704, IBM 3705-II, IBM 3725. IBM 3720, or IBM3745 Communications Controllers, all of which SNA defined...
The IBM 3270 is a family of block oriented display and printer computer terminals introduced by IBM in 1971 and normally used to communicate with IBM mainframes...
telecommunications control units. Terminal access controller IBM 270x IBM 3705 Communications Controller IBM 3720 IBM3745 System analysis handbook. Fort Benjamin Harrison...
marketed by IBM, but are still supported. IBM provides hardware maintenance and microcode updates for the estimated 20,000 installed 3745/3746 controllers...
the performance of an "average 3745." IBM Communication Controller for Linux on System z V1.2.1 Implementation Guide "IBM Communication Controller for Linux...
Australia: ACM. pp. 31–36. doi:10.1145/2814347.2814354. ISBN 978-1-4503-3745-8. S2CID 17847093. "Delta teases us with 'shower' that beats jet lag - CNN...
after retiring from IBM in June 2004. Pozefsky's publications include: “Storage Networking: More than an SNA Anagram” in NCP and 3745/46 Today, Summer 2001...
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