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IBM 37xx (or 37x5) is a family of
The 3725 and the 3720 systems were announced in 1983. The 3725 replaced the hardware line scanners used on previous 370x machines with multiple microcoded processors.
* The 3725 was a large-scale node and front end processor.
* The 3720 was a smaller version of the 3725, which was sometimes used as a remote concentrator.
* The 3726 was an expansion unit for the 3725.
With the expansion unit, the 3725 could support up to 256 lines at data rates up to 256 kbit/s, and connect to up to eight mainframe channels.
Marketing of the 372x machines was discontinued in 1989.
IBM discontinued support for the 3705, 3720, 3725 in 1999.
IBM
International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...
Systems Network Architecture
Systems Network Architecture (SNA) is IBM's proprietary computer network, networking architecture, created in 1974. It is a complete protocol stack for interconnecting computers and their resources. SNA describes formats and protocols but, in its ...
(SNA) programmable communications controllers used mainly in mainframe environments.
All members of the family ran one of three IBM-supplied programs.
*''Emulation Program'' (EP) mimicked the operation of the older IBM 270x
270x is a generic name for a family of IBM non-programmable communications controllers used with System/360 and System/370 computers.
The family consisted of the following devices:
* IBM 2701 Data Adapter Unit
* IBM 2702 Transmission Control
* I ...
non-programmable controllers.
*'' Network Control Program'' (NCP) supported Systems Network Architecture devices.
*''Partitioned Emulation Program'' (PEP) combined the functions of the two.
Models
370x series
* 3705 — the oldest of the family, introduced in 1972 to replace the non-programmableIBM 270x
270x is a generic name for a family of IBM non-programmable communications controllers used with System/360 and System/370 computers.
The family consisted of the following devices:
* IBM 2701 Data Adapter Unit
* IBM 2702 Transmission Control
* I ...
family. The 3705 could control up to 352 communications lines.
* 3704 was a smaller version, introduced in 1973. It supported up to 32 lines.
371x
The 3710 communications controller was introduced in 1984.372x series
The 3725 and the 3720 systems were announced in 1983. The 3725 replaced the hardware line scanners used on previous 370x machines with multiple microcoded processors.
* The 3725 was a large-scale node and front end processor.
* The 3720 was a smaller version of the 3725, which was sometimes used as a remote concentrator.
* The 3726 was an expansion unit for the 3725.
With the expansion unit, the 3725 could support up to 256 lines at data rates up to 256 kbit/s, and connect to up to eight mainframe channels.
Marketing of the 372x machines was discontinued in 1989.
IBM discontinued support for the 3705, 3720, 3725 in 1999.
374x series
* The 3745, announced in 1988, provides up to eight T1 circuits. At the time of the announcement, IBM was estimated to have nearly 85% of the over US$825 million market for communications controllers over rivals such as NCR Comten andAmdahl Corporation
Amdahl Corporation was an information technology company which specialized in IBM mainframe-compatible computer products, some of which were regarded as supercomputers competing with those from Cray Research. Founded in 1970 by Gene Amdahl, a for ...
. The 3745 is no longer marketed, but still supported and used.
* The 3746 "Nways Controller" model 900, unveiled in 1992, was an expansion unit for the 3745 supporting additional Token Ring and ESCON connections. A stand-alone model 950 appeared in 1995.
Successors
IBM no longer manufactures 37xx processors. The last models, the 3745/46, were withdrawn from marketing in 2002. Replacement software products are Communications Controller for Linux on System z and Enterprise Extender.Clones
Several companies produced clones of 37xx controllers, including NCR COMTEN andAmdahl Corporation
Amdahl Corporation was an information technology company which specialized in IBM mainframe-compatible computer products, some of which were regarded as supercomputers competing with those from Cray Research. Founded in 1970 by Gene Amdahl, a for ...
.
References
{{DEFAULTSORT:Ibm 37xx 37xx Computer networks 37xx 37xx