IBM TOKEN-RING NETWORK
Contents


Announcement Letter Number 185-123 dated October 15, 1985
US - Last Revised on October 15, 1985



Brief Description of Announcement, Charges, and Availability

     The IBM Token-Ring Network is a high-speed communications
network for interconnecting information processing equipment at a
local site (building or campus). The network uses the IBM Cabling
System, including Type 3 specified telephone media, for physical
interconnection, and a token-ring access protocol for network traffic
control.  Products are offered for attaching the IBM Personal
Computer to the network.


Customer Letter Section

HIGHLIGHTS
o   A general purpose local area network conforming to the Institute
    of Electrical and Electronics Engineers (IEEE) standard 802.5 and
    the European Computer Manufacturers Association (ECMA) standard
    89 for token-ring, baseband local area networks.
o   An "open" network architecture for accommodation of non-IBM and
    IBM attaching devices, with technical interface specifications
    available in first quarter 1986 from IBM, and semiconductor
    components available from Texas Instruments, Inc. for use in
    non-IBM devices.
o   Data transmission at a rate of 4 million bits per second.
o   Physical interconnection of network components using the IBM
    Cabling System data grade media (Type 1 or Type 2 cable) or Type
    3 specified telephone media.  See IBM Product Announcement
    185-125, dated October 15, 1985.
o   Modular and flexible network configurations, supporting from 2 to
    260 attaching devices with the IBM Cabling System data grade
    media and from 2 to 72 devices with Type 3 telephone media.
o   Network intelligence implemented in the attaching device
    adapters, providing significant network management capability.
o   Recovery facilities that allow failing components to be quickly
    isolated and often automatically bypassed.
o   Network growth facilitated by the capability to dynamically plug
    attaching devices into an operating network.
o   An adapter card for the attachment of the IBM Personal Computer
    to the network.
o   Logical link control for the IBM Personal Computer adapter
    conforming with the IEEE 802.2 standard.
o   An IBM Personal Computer program that provides a Systems Network
    Architecture (SNA) application programming interface to the
    network.  (See IBM Programming Announcement 285-399, dated
    October 15, 1985.)
o   An IBM Personal Computer program that provides an IBM PC Network
    network basic input/output system (NETBIOS) programming interface
    to the network. (See IBM Programming Announcement 285-398, dated
    October 15, 1985.)
o   An IBM Personal Computer program that links the IBM PC Network to
    the IBM Token-Ring Network.  (See IBM Programming Announcement
    285-400, dated October 15, 1985.)
o   Support of coaxial, twinaxial, loop, and token-ring devices on
    the IBM Cabling System data grade media, and coaxial and
    token-ring devices on Type 3 telephone media, easing migration to
    the local area network.
o   Cabling components for the easy implementation of networks
    without permanent cable installation.
       Today's announcement includes the following capabilities that
were previously identified in IBM statements of direction released
May 8, 1984 and August 14, 1984:
o   A token-ring local area network using the IBM Cabling System and
    conforming to the IEEE and ECMA standards.
o   Server functions for the token-ring local area network using the
    IBM PC Network Program.
o   Access to System/370-based applications from token-ring local
    area network workstations using an IBM 3270 compatible data
    stream.
o   Interconnection of the token-ring local area network to the IBM
    PC Network.
DESCRIPTION
       The IBM Token-Ring Network is a baseband token-ring local area
network that conforms to the IEEE 802.5 and IEEE 802.2 standards and
the ECMA 89 standards.
       Network attaching devices are cabled one to another through a
network access unit to form a logical ring configuration. Access to
the shared ring is controlled by a token (a special message
circulating on the ring). Baseband signaling is used for data
transmission.  Each attaching device regenerates the signal as
information is passed around the ring. The access protocol and
baseband signaling are implemented by a network adapter in each
attaching device.
       The components of the network include the adapters that reside
in attaching devices, network access units for linking the attaching
devices into a network, and cabling system elements for physical
interconnection.
       The IBM Cabling System is used to provide physical
interconnection between network attaching devices and access units.
Two twisted pairs of media are used to accommodate the receive and
transmit path requirements for ring transmission. Up to 260 devices
can be attached to the network using data grade media. Up to 72
devices can be attached to the network using Type 3 telephone media.
(For additional information on Type 3 telephone media, see IBM
Product Announcements 185-124 and 185-125, dated October 15, 1985.)
       Cabling components are available for pre-wiring a building,
using a star-wired configuration to connect work areas (that is,
offices) to wiring closets.  Network attaching devices are plugged
into work area outlets, and the outlets are linked into the network
at the wiring closets.  Multiple access units can be interconnected,
as required, to accommodate all of the attaching devices on the
network.
       Cable assemblies (patch cables) are available for use in
implementing networks without permanent cable installation.
       Potential benefits to be derived from the IBM Token-Ring
Network include:
o   Improved Connectivity: Each network attaching device has a direct
    communication path to other network attaching devices.
o   Responsive Data Communication: The local environment allows for
    high-speed data transmission techniques.
o   Resource Sharing: The connectivity and high-speed characteristics
    of the network allow for sharing of resources, such as files,
    printers, and communication links.
o   Distributed Application Implementation: The connectivity and
    high-speed characteristics of the network enhance the opportunity
    for distributed application implementation.
o   Structured Building Cabling: The physical interconnection for the
    network uses cabling and components designed for structured
    cabling techniques.
o   Ease of Growth: The network can be easily and cost effectively
    expanded from a small to a large network in a non-disruptive
    manner.
o   Equipment Relocation Flexibility:  The network implementation
    allows attaching devices to be easily connected to and
    disconnected from the network.
o   Reliable Data Communications: High reliability and availability
    are inherent qualities of the network and component design.
       The components of the IBM Token-Ring Network are:
o   IBM Token-Ring Network PC Adapter
           The IBM Token-Ring Network PC Adapter is a feature card
    for the IBM Personal Computer. The adapter contains a
    microprocessor operating under control of adapter resident
    microcode. The adapter transmits and receives at a speed of 4
    million bits per second using protocols conforming with IEEE
    802.5 and ECMA 89 standards.  The adapter provides logical link
    control functions conforming with the IEEE 802.2 standard.
    Significant reliability, availability, and serviceability
    functions are built into the adapter and microcode. Diagnostics
    invoked during adapter initialization verify the adapter
    operation and check-out the cabling to the access unit. The
    adapter detects permanent errors, such as loss of receive signal,
    and generates a notification signal to initiate automatic network
    recovery. Recoverable errors, such as bit errors in the
    transmitted message, are detected by the adapter for subsequent
    reporting to a ring diagnostic program.
           A diskette is included with the adapter, and supports the
    operation and testing of the adapter and network.  The adapter
    handler program provides a programming interface for the adapter.
    The adapter diagnostic program is used to verify the correct
    operation of the adapter.  The ring diagnostic program is used as
    an aid in problem determination. Permanent and recoverable error
    conditions are detected, and information on the probable source
    of the error is presented.
           A supplement to the IBM Personal Computer Guide to

    Operations is included with the adapter.  It contains
    installation instructions for the adapter and adapter support
    programs.
           An attachment cable is required for connecting the adapter
    to the network cabling system. The IBM Token-Ring Network PC
    Adapter Cable is a 2.4-meter (8-foot) attachment cable used to
    connect the adapter to data grade media. The Type 3 Media Filter
    includes a 2.4-meter (8-foot) cable and is used to connect the
    adapter to Type 3 telephone media. (See IBM Product Announcement
    185-125, dated October 15, 1985.)
           An advanced diagnostic program (IBM Token-Ring Network PC
    Adapter Hardware Maintenance and Service) is available for an
    additional charge to users and service personnel to assist in
    isolating faults to the adapter, the adapter attachment cable, or
    the cable between the work area and the wiring closet.
o   IBM Token-Ring Network Multistation Access Unit
           The access unit provides for attachment of up to eight
    devices to the network. Cables from attaching devices are simply
    plugged into the unit. An access unit can be interconnected to
    other access units to form larger networks.  The unit can
    automatically bypass an attached device by reacting to the
    presence or absence of a signal from the device.
           The access unit is designed for installation in a standard
    19-inch rack (not available from IBM) or in a component housing.
    The component housing is available as an optional accessory, and
    is required for installation of the access unit on a wall or
    table top.  A cable bracket is included with the access unit, and
    is used to organize and identify the cables attached to a
    rack-mounted access unit.
o   IBM Cabling System
           The cabling system is used to provide physical
    interconnection for the local area network.  Cabling system
    components for use in the structured, prewiring of a building are
    available, and include bulk cable, connectors, wall faceplates,
    and wiring closet distribution panels.  Four cable assemblies
    (patch cables) are available for use in implementing networks
    without permanent cable installation.  The cable assembly lengths
    are:  2.4 meters (8 feet), 9.1 meters (30 feet), 22.9 meters (75
    feet), and 45.7 meters (150 feet).  See IBM Product Announcements
    185-106, dated September 17, 1985 and 185-124 and 185-125, dated
    October 15, 1985.
           Data grade media, Type 1, Type 2  cable, or Type 3
    specified telephone media, are used for the network.  Type 3
    telephone media may allow network implementation using previously
    installed telephone cable.  Data grade media provide additional
    flexibility in network configuration. For additional information,
    see IBM Product Announcements 185-124 and 185-125, dated October
    15, 1985.
PUBLICATIONS
       The following publications are available through your local
IBM branch office.
o   IBM Token-Ring Network Introduction and Planning Guide
    (GA27-3677) - Information for developing an installation plan for
    the local area network.
o   IBM Token-Ring Network Installation Guide (GA27-3678)* -
    Instructions for the installation of the local area network using
    the previously installed IBM Cabling System data grade media.
    (Type 3 media information not included.)
o   IBM Token-Ring Network Telephone Twisted-Pair Media Guide
    (GA27-3714) - Contains component descriptions, limitations, Type
    3 media specifications, and planning and installation information
    for implementing the IBM Token-Ring Network on telephone
    twisted-pair media.
o   IBM Token-Ring Network Problem Determination Guide (SY27-0280)* -
    A step-by-step description of the procedures used to isolate and
    resolve network failures, including operational instructions for
    use of the ring diagnostic program. (Type 3 media information not
    included.)
o   IBM Cabling System Planning and Installation Guide (GA27-3361) -
    Information to assist the customer in planning, installing, and
    testing the cabling system. (Type 3 media information not
    included.)
o   Using the IBM Cabling System with Communication Products
    (GA27-3620) - Information to assist the customer in planning for
    the attachment of IBM equipment to the IBM Cabling System.  (Type
    3 media information not included.)
o   IBM Cabling System Catalog (G570-2040) - Component descriptions
    and ordering information for the IBM Cabling System.
o   IBM/ROLM Planning and Installation Guide for 3270
    Coax-to-Twisted-Pair Adapter (GA27-3722) - Information to assist
    the customer in using Type 3 telephone media for attaching 3270
    devices to controllers.
o   A Building Planning Guide for Communication Wiring (G320-8059) -
    Information to assist architects, engineers, and facility
    planners in planning a cabling system for new or existing
    buildings.
o   An Introduction to Local Area Networks (SC20-8203) - A self-study
    guide to introduce the concepts of local area networks.
       The following technical reference manuals are available from
IBM Direct (1-800-426-2468) and can assist vendors in developing
hardware and software products for attachment to the IBM Token-Ring
Network.
o   IBM Token-Ring Network Architecture Reference (6165877)* - A
    detailed description of the IEEE 802.5 token-ring access protocol
    and the IEEE 802.2 logical link control as implemented for the
    IBM Token-Ring Network.
o   IBM Token-Ring Network PC Adapter Technical Reference (6165876)*
    - A detailed description of the adapter operation and programming
    interfaces.
*    Available in first quarter 1986.
EDUCATION
       The Locally Attached Personal Computers (G4000) course has
been updated to include information on the IBM Token-Ring Network.
The IBM Cabling System Planning (G3644) and IBM Cabling System Layout
and Physical Installation (G3648) courses have been updated to
include planning and installation information for the multistation
access unit and for Type 3 telephone media accessories.  Call IBM
Direct at 1-800-426-2468 for course locations and schedules.
SCHEDULE
       Planned first customer shipment is first quarter 1986.
TECHNICAL INFORMATION
SPECIFIED OPERATING ENVIRONMENT
HARDWARE REQUIREMENTS: An operational network consists of cabling,
access units, and attaching devices. Each attaching device requires a
network adapter.
       For attachment of the IBM Personal Computer to the network,
the IBM Token-Ring Network PC Adapter requires a full-sized expansion
slot in one of the following supported system units:
o   IBM 5150 Personal Computer
o   IBM 5155 Portable Personal Computer
o   IBM 5160 Personal Computer XT
o   IBM 5170 Personal Computer AT
       The adapter is not supported for use in the IBM 5161 Personal
Computer System Expansion Unit.
SOFTWARE REQUIREMENTS: The latest level of IBM Personal Computer Disk
Operating System (DOS) at IBM Token-Ring Network availability is
supported.  Two application program interfaces are provided with the
IBM Token-Ring Network PC Adapter.
o   An IEEE 802.2 data link control programming interface. (See the
    IBM Token-Ring Network PC Adapter Technical Reference - 6165876.)
o   An IEEE 802.5 direct physical control programming interface.
    (See the IBM Token-Ring Network PC Adapter Technical Reference -
    6165876.)
       Memory requirements for the IBM Personal Computer are 7Kb for
the adapter handler program supporting the two adapter programming
interfaces in addition to the DOS memory requirement.
       In addition, two high-level programming interfaces are
available.
o   Advanced Program-to-Program Communications for the IBM Personal
    Computer (APPC/PC) provides an SNA APPC (LU 6.2, PU 2.1)
    application programming interface to the network. (See IBM
    Programming Announcement 285-399, dated October 15, 1985.)

    Application programs can be developed for the IBM Personal
    Computer using communication protocols common to other SNA
    devices (System/370, System/36, System/38, Series/1). Memory
    requirements for the program are 195Kb, in addition to the DOS
    memory requirement and 7Kb for the adapter handler program.
o   The IBM Token-Ring Network NETBIOS Program is available for the
    IBM Personal Computer and provides a NETBIOS application
    programming interface.  (See IBM Programming Announcement
    285-398, dated October 15, 1985.)  Application programs written
    to the NETBIOS programming interface can operate on both the IBM
    Token-Ring Network and the IBM PC Network.  Memory requirements
    for the IBM Personal Computer are 46Kb for the NETBIOS program,
    in addition to the DOS memory requirement and 7Kb for the adapter
    handler program.
       The following programs use the NETBIOS programming interface
and have been successfully tested on the IBM Token-Ring Network.
o   IBM PC Network SNA 3270 Emulation Program
o   IBM Asynchronous Communications Server Program
o   IBM Token-Ring Network/PC Network Interconnect Program
o   IBM PC Network Program
    -   Programs that operate in the IBM PC Network environment using
        the server functions of the IBM PC Network Program, including
        the programs listed in IBM Programming Announcement 285-132,
        dated April 2, 1985, should operate in the IBM Token-Ring
        Network environment using the server functions of the IBM PC
        Network Program. Programs that have been successfully tested
        include:
APL Version 1
BASIC Compiler Version 1
BASIC Interpreter Version 3.1
Binary Synchronous 3270 Emulation Version 1
COBOL Compiler Version 1
DisplayWrite 1
DisplayWrite 3 Version 1
DisplayWrite Legal Support Version 1
DisplayWrite Medical Support Version 1
FileCommand Version 1
FORTRAN Compiler Version 2
Graphical Kernel System Version 1
Graphics Development Toolkit Version 1
Graphics File System Version 1
IBM Business Management Series Application Editions with Local Area
  Network Access Edition**
IBM Filing Assistant Version 1
IBM Graphing Assistant Version 1
IBM Local Area Network PrintManager**
IBM Personal Telephone Manager Program
IBM Personal Telephone Manager Program for the IBM Personal Computer
  Voice Communication Option***
IBM Planning Assistant Version 1
IBM Reporting Assistant Version 1
IBM Writing Assistant Version 1
IBM 3101 Emulation Version 1
Macro Assembler Version 2
Multiplan Version 1.1
Office Correspondence Retrieval System (OCRS) Version 1
Pascal Compiler Version 2
Personal Editor Version 1
Plotting System Version 1
Professional Editor Version 1
Professional FORTRAN Compiler Version 1
SCRIPT/PC Version 1
Solutions Series: IBM Accounting Solutions Version 1
Solutions Series: IBM Executive Solutions Version 1
Solutions Series: IBM Home Solutions Version 1
Sort Version 1
Word Proof Version 1
**   To be available for use with the IBM Token-Ring Network in the
     second quarter 1986.
***  To be available for use with the IBM Token-Ring Network in the
     third quarter 1986.
    -   The IBM PC Network Program using an IBM Personal Computer
        with the IBM 3812 Pageprinter as a print server has been
        successfully tested on the IBM Token-Ring Network.
    -   The IBM Series/1 PC Connect Program (5719-CN1) will be
        available for use with the IBM Token-Ring Network in the
        second quarter 1986.
    -   ROLM's Juniper II Personal Communication Software will
        coexist with a network application program such as the IBM PC
        Network Program, in an IBM Personal Computer attached to the
        network.  (See IBM Product Announcement 185-127, dated
        October 15, 1985 for additional information.)
       Note: Refer to program documentation for specific hardware
configurations supported by the programs listed above.
SECURITY, AUDITABILITY, AND CONTROL
       User management is responsible for evaluation, selection, and
implementation of security features, for administrative procedures,
and for appropriate controls in application systems.
       Data transmitted on the network passes through each network
attaching device adapter. Users may wish to take the added security
precaution of encrypting sensitive information before it is
transmitted.
PLANNING INFORMATION
ORDERING INFORMATION: Orders for any quantity of IBM Token-Ring
Network components will be accepted by IBM marketing representatives.
Delivery schedules will be available in the first quarter 1986.
Orders for large volumes are subject to extended delivery schedules.
Orders for quantities less than twenty will be accepted by IBM
Product Centers.
       IBM Cabling System components are available from IBM Cabling
System distributors and from IBM Direct.  Accessories for use of Type
3 telephone media are available from IBM Cabling System distributors.
Your IBM marketing representative can assist in locating a
distributor.
CUSTOMER RESPONSIBILITY: The customer is responsible for:
o   Planning the network configuration.
o   Installing a cabling system.
o   Installing the network adapters and the access units.
o   Connecting the adapters and access units into a network.
o   Performing customer problem isolation procedures for the
    token-ring network and customer problem analysis and resolution
    procedures for the access unit and attaching devices.
o   Maintaining accurate configuration charts.
o   Labeling all devices and cables.
TECHNICAL ASSISTANCE
       The IBM Personal Computing Assistance Center (PCAC) will
provide planning and usage assistance to eligible IBM customers for
the period of their qualifying IBM Personal Computer Volume
Procurement Agreement (VPA).
       The IBM Cabling System Customer Assistance Center (CSCAC) will
provide planning and usage assistance to eligible IBM Cabling System
customers for the period of their eligibility. The Series/1 Customer
Assistance Center will provide planning and usage assistance to
eligible IBM Series/1 customers for the period of their eligibility.
CHARGES, TERMS, AND CONDITIONS
CHARGES
                          Network Products
                              Machine/     Part        Purchase
                              Feature      Number      Price
IBM Token-Ring Network
 PC Adapter                   3391***      6339100       $695
 PC Adapter Cable             3390***      6339098         35
 Multistation Access Unit     8228-001     6091014        660
***  A feature of the IBM Personal Computer (5150, 5155, 5160, 5170)
                   Technical Support Publications+
IBM Token-Ring Network
 Architecture Reference                    6165877        295
 PC Adapter Technical Reference            6165876        195
 PC Adapter Hardware Maintenance
 and Service                               6165880        250
       + Order from IBM Direct at 1-800-426-2468.
                           Minimum         Annual Minimum
                           Warranty        Maintenance
                           Option Charge   Charge
                           COE             CCE      COE
                           #9826           #9816    #9824
IBM Token-Ring
 Network Multistation
 Access Unit               $5              $45      $50
       Service charges for the IBM Personal Computer system unit are
not affected by the addition of the IBM Token-Ring PC Adapter.
ACCESSORY: The following accessory is available for the IBM 8228
Token-Ring Network Multistation Access Unit:
                        Feature     Part        Purchase
                        Code        Number      Price
IBM Cabling System
Component Housing       1078        6091078       $99

TERMS AND CONDITIONS
CUSTOMER SETUP: The customer is responsible for the installation of
the IBM Token-Ring Network. Installation instructions are included
with each item.  Installation service for the PC Adapter and the
Multistation Access Unit is available from IBM at the applicable
hourly service rate and minimum charge.
WARRANTY PERIOD: One year for the IBM Token-Ring Network PC Adapter
and IBM Token-Ring Network Multistation Access Unit.
WARRANTY SERVICE: Warranty service for the IBM Token-Ring Network PC
Adapter is the same as the warranty service delivery for the IBM
Personal Computer in which the adapter is installed. When the
warranty period of the adapter extends beyond the warranty period of
the base system unit, the customer will be required, upon request, to
provide proof of purchase to obtain warranty service for the adapter.
Customer Carry-in Exchange (CCE) warranty service is provided for the
IBM Token-Ring Network Multistation Access Unit under the Agreement
for Purchase of IBM Machines (Z120-2892) and the Amendment for IBM
Service/Exchange Center Service (Z125-3385). Service is obtained by
calling the IBM Service/Exchange Communication Center's toll-free
number (800) 428-2569.
WARRANTY OPTIONS: Customer On-Site Exchange (COE) is available for
the IBM Token-Ring Network Multistation Access Unit for the
applicable Warranty Option Charge under the IBM Maintenance Agreement
(Z125-3275) and the Amendment for IBM Service/Exchange Center Service
(Z125-3385).
MAINTENANCE SERVICE: Maintenance service for the IBM Token-Ring
Network PC Adapter is the same as the service for the IBM Personal
Computer in which the adapter is installed.  Customer Carry-in
Exchange (CCE) or Customer On-Site Exchange (COE) maintenance service
is available for the IBM Token-Ring Network Multistation Access Unit
under the IBM Maintenance Agreement (Z125-3275) and the Amendment for
IBM Service/Exchange Center Service (Z125-3385). The service
offerings are described in the Information Bulletin for Customers,
IBM Service/Exchange Center Services and Associated On-Site Services
(G125-3488).  Service is obtained by calling the IBM Service/Exchange
Communication Center.
PROBLEM ISOLATION ASSISTANCE: On-site problem isolation assistance
for IBM Token-Ring Network hardware components is available at IBM's
applicable hourly service rate and minimum charge. Assistance is
provided in support of IBM products using problem determination
procedures specified in the IBM Token-Ring Network Problem
Determination Guide (SY27-0280) and IBM Cabling System Planning and
Installation Guide (GA27-3361) publications.  The publications are
required for problem isolation, and the customer is responsible for
maintaining the publications at the customer site.
CUSTOMER PROBLEM ANALYSIS AND RESOLUTION (CPAR) ASSISTANCE: On-site
CPAR assistance for the IBM Personal Computer with the IBM Token-Ring
Network PC Adapter is available at IBM's applicable hourly service
rate and minimum charge. IBM service will use the same documentation
that is available to the customer.
ADDITIONAL SERVICE: Service for defects in the adapter handler
program provided with the IBM Token-Ring Network PC Adapter will be
available from the IBM Support Center until June 30, 1987. However,
IBM does not warrant that errors will be corrected. Detailed
procedures for the identification of designated customer
representatives who can contact the IBM Support Center will be
defined at network availability.
EDUCATIONAL ALLOWANCE: An educational allowance of 20% is available
to qualifying institutions.  The education allowance is not additive
to any other discount or allowance.
VOLUME PROCUREMENT AMENDMENT (VPA): Volume purchase is available for
components of the IBM Token-Ring Network PC Adapter under the Volume
Procurement Amendment (VPA) to the Agreement for Purchase of IBM
Machines.
       The IBM Personal Computer Volume Procurement Amendment Exhibit
establishes the discount schedule for the PC Adapter as a feature of
the IBM Personal Computer.
       For additional information regarding volume orders, contact
your IBM marketing representative.
       The following is applicable to the IBM Token-Ring Network
Multistation Access Unit.
PRODUCTION STATUS: The unit is in new production and qualifies for
the Investment Tax Credit.
PRE-INSTALLATION TEST ALLOWANCE: None
MACHINE GROUP: A
IBM HOURLY SERVICE RATE CLASSIFICATION: 2
ELIGIBLE MACHINE UNDER ALTERNATIVE CERTIFICATION FOR IBM MACHINES:
Yes