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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.
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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
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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.
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IBM no longer manufactures 37xx processors. The last models, the 3745/46, were withdrawn from marketing in 2002. Replacement software products are
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398:"Nways Controller" model 900, unveiled in 1992, was an expansion unit for the 3745 supporting additional
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was a smaller version of the 3725, which was sometimes used as a remote concentrator.
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IBM Communication
Controller for Linux on System z V1.2.1 Implementation Guide
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526:"Communications Processors Rise to Challenge of Larger, Faster Networks"
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was a smaller version, introduced in 1973. It supported up to 32 lines.
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IBM 3704 and 3705 Communications
Controllers Hardware: Student Text
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All members of the family ran one of three IBM-supplied programs.
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Several companies produced clones of 37xx controllers, including
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Series of mainframe communication controllers manufactured by IBM
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391:. The 3745 is no longer marketed, but still supported and used.
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The 3725 controller (right small-height rack), connected to an
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family. The 3705 could control up to 352 communications lines.
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221:(SNA) programmable communications controllers used mainly in
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IBM discontinued support for the 3705, 3720, 3725 in 1999.
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Marketing of the 372x machines was discontinued in 1989.
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connections. A stand-alone model 950 appeared in 1995.
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49:. Unsourced material may be challenged and removed.
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304:communications controller was introduced in 1984.
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607:"Low-end FEP market to expand through early 90s"
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633:"IBM adds rich array of network products"
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235:(EP) mimicked the operation of the older
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713:Korzeniowski, Paul (December 15, 1986).
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550:Horwitt, Elizabeth (May 26, 1986).
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812:. You can help Knowledge by
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753:computer networking
530:Communications News
421:Enterprise Extender
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142:IBM 3725 controller
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36:verification
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368:374x series
308:372x series
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184:Predecessor
853:Categories
505:2012-09-01
443:References
433:NCR COMTEN
411:Successors
400:Token Ring
385:NCR Comten
69:newspapers
58:"IBM 37xx"
195:Successor
318:IBM 4381
283:IBM 270x
237:IBM 270x
208:IBM 37xx
201:software
188:IBM 270x
166: (
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320:system
258:Models
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341:The
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328:The
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212:37x5
210:(or
179:2002
168:1972
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62:news
216:IBM
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