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Importing Wikidata short description: "1960s-era IBM mainframe communication controllers"
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{{Short description|1960s-era IBM mainframe communication controllers}}
⚫
'''270x''' is a generic name for a family of [[IBM]] non-programmable [[Front end processor|communications controllers]] used with [[System/360]] and [[System/370]] computers.
{{Infobox information appliance
| name = IBM 270x series
| cost =
| successor = [[IBM 37xx]] series
| logo_size = 120px
| logo_caption =
| image =
| image_size = 270px
| caption =
| type = [[Front-end processor|Communication controllers]]
| designfirm =
| manufacturer =
| release date = {{Start date and age|1967}}
| discontinued =
| processor =
| memory =
| logo = File:IBM Logo 1956 1972.svg
| frequency =
| slots =
| coprocessor =
| connection =
| ports =
| power =
| speed =
| language =
| weight =
| dimensions =
| predecessor =
| related =
⚫
}}'''270x''' is a generic name for a family of [[IBM]] non-programmable [[Front end processor|communications controllers]] used with [[System/360]] and [[System/370]] computers.


The family consisted of the following devices:
The family consisted of the following devices:
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* IBM 2703 Transmission Control
* IBM 2703 Transmission Control


The 2701 and 2702 were announced simultaneously with System/360 in 1964, the 2703 was announced a year later.<ref name=Pugh>{{cite book|last1=Pugh|first1=Emerson W.|last2=Johnson|first2=Lyle R.|last3=Palmer|first3=John H.|title=IBM's 360 and Early 370 Systems|year=1991|publisher=MIT Press|isbn=0-262-16123-0|url=http://www.amazon.com/IBMs-Early-Systems-History-Computing/dp/0262161230}}</ref>{{rp|p.181}}
The 2701 and 2702 were announced simultaneously with System/360 in 1964, the 2703 was announced a year later.<ref name=Pugh>{{cite book|last1=Pugh|first1=Emerson W.|last2=Johnson|first2=Lyle R.|last3=Palmer|first3=John H.|title=IBM's 360 and Early 370 Systems|year=1991|publisher=MIT Press|isbn=0-262-16123-0|url=https://archive.org/details/ibms360early370s0000pugh|url-access=registration}}</ref>{{rp|p.181}}


The 270x series was superceded by the [[IBM 3705 Communications Controller|IBM 3704 and 3705 communications controllers]] in 1972.
The 270x series was superseded by the [[IBM 3705 Communications Controller|IBM 3704 and 3705 communications controllers]] in 1972.


==2701==
==2701==
The 2701 supported up to four [[Asynchronous serial communication|start-stop]] [[Binary Synchronous Communications|or synchronous]] communications lines. It had two multiplexer [[Channel I/O|channel interfaces]] for connection to one or two host computers. The synchronous adapter originally supported STR protocol, and BISYNC when it was introduced in 1967<ref name=Pugh />{{rp|p.581}}, in [[half duplex]] mode at speeds of up to 40,800&nbsp;bits&nbsp;per&nbsp;second&nbsp;(bps). The 2701 could also have "data acquisition and control adapters" for direct control of external equipment.<ref>{{cite book|last=IBM Corporation|title=IBM 2701 Data Adapter Unit Principles of Operation|year=1965|url=http://www.bitsavers.org/pdf/ibm/27xx/A22-6864-0_2701_Data_Adapter_PrincOps_Jul65.pdf}}</ref>
The 2701 supported up to four [[Asynchronous serial communication|start-stop]] or synchronous communications lines. It had two multiplexor [[Channel I/O|channel interfaces]] for connection to one or two host computers. The synchronous adapter originally supported the ''Synchronous Transmit-Receive (STR)'' protocol, and later [[Binary Synchronous Communications|''Binary Synchronous Communications (BISYNC)'']] when it was introduced in 1967,<ref name=Pugh />{{rp|p.581}} in [[half duplex]] mode at speeds of up to 40,800&nbsp;bits&nbsp;per&nbsp;second&nbsp;(bit/s). The 2701 could also have "data acquisition and control adapters" for direct control of external equipment.<ref>{{cite book|last=IBM Corporation|title=IBM 2701 Data Adapter Unit Principles of Operation|year=1965|url=http://www.bitsavers.org/pdf/ibm/27xx/A22-6864-0_2701_Data_Adapter_PrincOps_Jul65.pdf}}</ref>


Initially the 2701 supported the following devices:<ref name=Config />
Initially the 2701 supported the following devices:<ref name=Config />
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* [[IBM 7750]] Programmed Transmission Control
* [[IBM 7750]] Programmed Transmission Control
* Remote System/360 with 2701
* Remote System/360 with 2701

* Serial synchronous terminals
* Serial synchronous terminals

* [[IBM 1030]] Data Collection System
* [[IBM 1030]] Data Collection System
* [[IBM 1050]] Data Communication System
* [[IBM 1050]] Data Communication System
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* Common Carrier TWX Stations
* Common Carrier TWX Stations
* European Teleprinters
* European Teleprinters

* Parallel data devices
* Parallel data devices
* Contact sense terminals
* Contact sense terminals
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Later the [[IBM 2740]] and [[IBM 2741]] Communication Terminals, and the [[IBM 2260|IBM 2260/2848]] were added.
Later the [[IBM 2740]] and [[IBM 2741]] Communication Terminals, and the [[IBM 2260|IBM 2260/2848]] were added.



==2702==
==2702==
The 2702 could accommodate up to 31 communication lines, but at a slower speed than the 2701.<ref name=Pugh />{{rp|p.581}} The System/360 Configurator indicates that in the 2702 supported start-stop lines only.<ref name=Config>{{cite book|last=IBM Corporation|title=IBM System/360 Input/Output Configurator|year=1965|url=http://www.bitsavers.org/pdf/ibm/360/configurator/A22-6823-1_System_360_IO_Configurator_Jul65.pdf}}</ref>
The 2702 could accommodate up to 31 communication lines, but at a slower speed than the 2701.<ref name=Pugh />{{rp|p.581}} The System/360 Configurator indicates that in the 2702 supported start-stop lines only.<ref name=Config>{{cite book|last=IBM Corporation|title=IBM System/360 Input/Output Configurator|year=1965|url=http://www.bitsavers.org/pdf/ibm/360/configurator/A22-6823-1_System_360_IO_Configurator_Jul65.pdf}}</ref>


Initially the 2702 supported the following terminals:
Initially the 2702 supported the following terminals:
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==2703==
==2703==
The 2703 supported up to 176 half-duplex start-stop or synchronous communication lines, originally ''Synchronous Transmit-Receive (STR)'' and later BISYNC. The maximum speed of one line was 2400&nbsp;bps but the total aggregate line speed was limited. By 1970 the maximum line speed had been raised to 4800&nbsp;bps. The 2703 attached to a single multiplexer channel; each communication line occupied a subchannel. It had a four or eight byte buffer per line to reduce data transfer to and from the host computer. The '''IBM 2712''' Remote Multiplexer allowed up to fourteen slow speed devices to be multiplexed over one high speed line to a 2703.<ref>{{cite book|last=IBM Corporation|title=IBM 2703 Transmission Control Component Description|year=1967|url=http://www.bitsavers.org/pdf/ibm/27xx/GA27-2703-1_2703_Transmission_Ctl_Component_Descr_May67.pdf}}</ref>
The 2703 supported up to 176 half-duplex start-stop or Binary Synchronous communication lines. The maximum speed of one line was 2400&nbsp;bit/s but the total aggregate line speed was limited. By 1970 the maximum line speed had been raised to 4800&nbsp;bit/s. The 2703 attached to a single multiplexer channel; each communication line occupied a subchannel. It had a four or eight byte buffer per line to reduce data transfer to and from the host computer. The '''IBM 2712''' Remote Multiplexer allowed up to fourteen slow speed devices to be multiplexed over one high speed line to a 2703.<ref>{{cite book|last=IBM Corporation|title=IBM 2703 Transmission Control Component Description|year=1967|url=http://www.bitsavers.org/pdf/ibm/27xx/GA27-2703-1_2703_Transmission_Ctl_Component_Descr_May67.pdf}}</ref>


As of 1967 the 2703 supported the following terminals:
As of 1967 the 2703 supported the following devices:
* [[IBM 1030]] Data Collection System
* [[IBM 1030]] Data Collection System
* [[IBM 1050]] Data Communication System
* [[IBM 1050]] Data Communication System
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==External links==
==External links==
* [http://www.bitsavers.org/pdf/ibm/27xx/GA22-6864-5_2701_Component_Description_Aug71.pdf Component Description: IBM 2701 Data Adapter Unit]
* [https://web.archive.org/web/20110322163242/http://www.bitsavers.org/pdf/ibm/27xx/GA22-6864-5_2701_Component_Description_Aug71.pdf Component Description: IBM 2701 Data Adapter Unit]
* [http://www.bitsavers.org/pdf/ibm/27xx/GA27-2703-2_2703_Transmission_Ctl_Component_Descr_Sep70.pdf IBM 2703 Transmission Control Component Description]
* [https://web.archive.org/web/20110322163358/http://www.bitsavers.org/pdf/ibm/27xx/GA27-2703-2_2703_Transmission_Ctl_Component_Descr_Sep70.pdf IBM 2703 Transmission Control Component Description]


[[Category:Mainframe computer stubs]]
[[Category:IBM System/360 mainframe line|270x]]


[[Category:IBM mainframe peripherals|270x]]
{{compu-network-stub}}
[[Category:Networking hardware|270x]]
{{mainframe-compu-stub}}

Revision as of 13:27, 21 June 2023

IBM 270x series
TypCommunication controllers
Release date1967; 57 years ago (1967)
SuccessorIBM 37xx series

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
  • IBM 2703 Transmission Control

The 2701 and 2702 were announced simultaneously with System/360 in 1964, the 2703 was announced a year later.[1]: p.181 

The 270x series was superseded by the IBM 3704 and 3705 communications controllers in 1972.

2701

The 2701 supported up to four start-stop or synchronous communications lines. It had two multiplexor channel interfaces for connection to one or two host computers. The synchronous adapter originally supported the Synchronous Transmit-Receive (STR) protocol, and later Binary Synchronous Communications (BISYNC) when it was introduced in 1967,[1]: p.581  in half duplex mode at speeds of up to 40,800 bits per second (bit/s). The 2701 could also have "data acquisition and control adapters" for direct control of external equipment.[2]

Initially the 2701 supported the following devices:[3]

  • IBM 1009 Data Transmission Unit
  • IBM 1013 Card Transmission Terminal
  • IBM 7701 Magnetic Tape Transmission Terminal
  • IBM 7702 Magnetic Tape Transmission Terminal
  • IBM 7710 Data Communication Unit
  • IBM 7711 Data Communication Unit
  • IBM 7740 Communication Control System
  • IBM 7750 Programmed Transmission Control
  • Remote System/360 with 2701
  • Serial synchronous terminals
  • IBM 1030 Data Collection System
  • IBM 1050 Data Communication System
  • IBM 1060 Data Communication System
  • IBM 1070 Process Communication System
  • AT&T 83B2 Type Selective Calling Terminals
  • Western Union Plan 115A Outstations
  • Common Carrier TWX Stations
  • European Teleprinters
  • Parallel data devices
  • Contact sense terminals
  • Contact operate terminals

Later the IBM 2740 and IBM 2741 Communication Terminals, and the IBM 2260/2848 were added.

2702

The 2702 could accommodate up to 31 communication lines, but at a slower speed than the 2701.[1]: p.581  The System/360 Configurator indicates that in the 2702 supported start-stop lines only.[3]

Initially the 2702 supported the following terminals:

  • IBM 1030 Data Collection System
  • IBM 1050 Data Communication System
  • IBM 1060 Data Communication System
  • IBM 1070 Process Communication System
  • AT&T 83B2 Type Selective Calling Terminals
  • Western Union Plan 115A Outstations
  • Common Carrier TWX Stations
  • European Teleprinters

Later the IBM 2740 and IBM 2741 Communication Terminals, the IBM 1032 Digital Time Unit, and a second channel interface were added.

2703

The 2703 supported up to 176 half-duplex start-stop or Binary Synchronous communication lines. The maximum speed of one line was 2400 bit/s but the total aggregate line speed was limited. By 1970 the maximum line speed had been raised to 4800 bit/s. The 2703 attached to a single multiplexer channel; each communication line occupied a subchannel. It had a four or eight byte buffer per line to reduce data transfer to and from the host computer. The IBM 2712 Remote Multiplexer allowed up to fourteen slow speed devices to be multiplexed over one high speed line to a 2703.[4]

As of 1967 the 2703 supported the following devices:

  • IBM 1030 Data Collection System
  • IBM 1050 Data Communication System
  • IBM 1060 Data Communication System
  • IBM 1070 Process Communication System
  • IBM 2741 and 2740 Communications Terminals
  • AT&T 83B2 Type Selective Calling Terminals
  • Western Union Plan 115A Outstations
  • Common Carrier TWX Stations
  • Remote System/360 via 2701 with 2701 or 2703
  • IBM 2780 Data Transmission Terminal
  • IBM 1130 Computing System with Synchronous Communications Adapter (SCA)

Clones

Many companies produced clones of 270x controllers, such as the Memorex 1270, introduced in 1970, and devices from NCR-Comten.

References

  1. ^ a b c Pugh, Emerson W.; Johnson, Lyle R.; Palmer, John H. (1991). IBM's 360 and Early 370 Systems. MIT Press. ISBN 0-262-16123-0.
  2. ^ IBM Corporation (1965). IBM 2701 Data Adapter Unit Principles of Operation (PDF).
  3. ^ a b IBM Corporation (1965). IBM System/360 Input/Output Configurator (PDF).
  4. ^ IBM Corporation (1967). IBM 2703 Transmission Control Component Description (PDF).
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