ANSI X3.263-1995: FDDI TP-PMD标准详解

5星 · 超过95%的资源需积分: 50 27 浏览量更新于2023-03-16 3 收藏 247KB PDF 举报

"ANSI X3.263-1995是美国国家标准学会（American National Standards Institute，ANSI）于1995年发布的一项标准，主要关注光纤分布式数据接口（Fibre Distributed Data Interface，FDDI）的令牌环双绞线物理层介质依赖（Token Ring Twisted Pair Physical Layer Medium Dependent，TP-PMD）部分。该标准旨在为高性能的多站网络提供通信规范，设计目标是在100兆比特每秒的数据速率下，利用令牌环架构和双绞线电缆作为传输媒介，支持长达100米的链路距离。" ANSI X3.263-1995标准详细规定了在FDDI网络中，如何利用双绞线这种物理介质来实现100Mbps的数据传输。FDDI是一种广泛用于局域网（LAN）的技术，它提供了比早期的以太网更高的带宽和可靠性。在FDDI网络中，数据通过令牌传递的方式进行通信，以避免多个设备同时发送数据导致的冲突，从而提高网络效率。双绞线物理层介质依赖部分（TP-PMD）是标准中的关键内容，它定义了在双绞线上传输高速数据所需的具体电气特性、信号编码方式、接口规范和连接器类型等。这些规定确保了不同厂商的设备能够在同一网络中无缝协同工作，遵循相同的标准，从而增强了网络的互操作性和兼容性。标准的制定遵循了ANSI的公正流程，包括公众审查、共识达成和其他审批条件，以确保标准的公平性和技术合理性。ANSI的批准意味着这个标准已经过严格的评审，满足了所有必要的技术和法律要求。在实际应用中，ANSI X3.263-1995对于网络设计师和工程师来说至关重要，它提供了构建高效、可靠的双绞线FDDI网络的技术基础。此标准的实施，使得在那些不适合铺设光纤或者对成本敏感的环境中，仍能实现高速的局域网通信，对当时的IT行业发展起到了积极的推动作用。

AMERICAN NATIONAL STANDARD ANSI X3.263-1995

American National Standard

for Information Technology –

Fibre Distributed Data Interface (FDDI) –

Token Ring Twisted Pair Physical Layer

Medium Dependent (TP-PMD)

1 Scope

This standard specifies Twisted Pair Physical Layer Medium Dependent (TP-PMD) requirements for the

Fibre Distributed Data Interface (FDDI).

FDDI provides a high-bandwidth (100 Mbit/s), general-purpose interconnection among computers and

peripheral equipment using fibre optics and twisted pair as the transmission media. FDDI can be config-

ured to support a sustained data transfer rate of at least 80 Mbit/s (10 Mbyte/s). FDDI provides connectiv-

ity for many nodes distributed over distances of several kilometers in extent. Default values for FDDI are

calculated on the basis of 1 000 physical links and a total fibre path length of 200 km (typically corre-

sponding to 500 nodes and 100 km of dual fibre cable).

FDDI consists of:

a) a Physical Layer (PL), which is divided into two sublayers:

1) A Physical Layer, Medium Dependent (PMD) sublayer (ISO/IEC 9314-3), with several alterna-

tive medium choices, which provides the digital baseband point-to-point communication between

nodes in the FDDI network. The PMD provides all services necessary to transport a suitably coded

digital bit stream from node to node. The PMD defines and characterizes the medium drivers and

receivers, medium-dependent code requirements, cables, connectors, power budgets, optical by-

pass provisions, and physical-hardware-related characteristics. It specifies the point of interconnec-

tability for conforming FDDI attachments.

The original PMD standard (ISO/IEC 9314-3), called PMD, defines attachment to multi-mode fibre

up to 2 km, while this TP-PMD defines low-cost attachments to twisted pair up to 100 m. Additional

PMD sublayer standards are being developed for attachment to single mode fibre (SMF-PMD), and

multi-mode fibre up to 500 m (LCF-PMD);

2) A Physical Layer Protocol (PHY) sublayer (ISO/IEC 9314-1), and its enhancement, (PHY-2),

which provides connection between the PMD and the Data Link Layer. PHY establishes clock syn-

chronization with the upstream code-bit data stream and decodes this incoming code-bit stream into

an equivalent symbol stream for use by the higher layers. PHY provides encoding and decoding

between data and control indicator symbols and code bits, medium conditioning and initializing, the

synchronization of incoming and outgoing code-bit clocks, and the delineation of octet boundaries

as required for the transmission of information to or from higher layers. Information to be transmitted

on the medium is encoded by the PHY using a group transmission code;

b) a Data Link Layer (DLL), which is divided into two or more sublayers:

1) An optional Hybrid Ring Control (HRC) (ISO/IEC 9314-5), which provides multiplexing of

packet and circuit switched data on the shared FDDI medium. HRC comprises two internal

components, a Hybrid Multiplexer (H-MUX) and an Isochronous MAC (I-MAC). H-MUX main-

tains a synchronous 125 µs cycle structure and multiplexes the packet and circuit switched

data streams, and I-MAC provides access to circuit switched channels;

ANSI X3.263-1995

2) A Media Access Control (MAC) (ISO 9314-2), and its enhancement (MAC-2), which pro-

vides fair and deterministic access to the medium, address recognition, and generation and

verification of frame check sequences. Its primary function is the delivery of packet data, in-

cluding frame generation, repetition, and removal;

3) An optional Logical Link Control (LLC), which provides a common protocol for any re-

quired packet data adaptation services between MAC and the Network Layer. LLC is not

specified by FDDI;

4) An optional Circuit Switching Multiplexer (CS-MUX), which provides a common protocol

for any required circuit data adaptation services between I-MAC and the Network Layer. CS-

MUX is not specified by FDDI;

c) a Station Management (SMT), which provides the control necessary at the node level to man-

age the processes under way in the various FDDI layers such that a node may work cooperatively

on a ring. SMT provides services such as control of configuration management, fault isolation and

recovery, and scheduling policies.

FDDI TP-PMD is a supporting document to FDDI PHY and FDDI PHY-2 which should be read in conjunc-

tion with it. The FDDI SMT document should be read for information pertaining to supported FDDI node

and network configurations.

ISO/IEC 9314 specifies the interfaces, functions, and operations necessary to ensure interoperability be-

tween conforming FDDI implementations. This standard provides a functional description. Conforming

implementations may employ any design technique that does not violate interoperability.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of

this standard. At the time of publication, the editions indicated were valid. All standards are subject to re-

vision, and parties to agreements based on standard are encouraged to investigate the possibility of ap-

plying the most recent editions of the standards indicated below. Members of IEC and ISO maintain reg-

isters of currently valid International Standards.

ANSI/EIA/TIA 568-1991,

Commercial building telecommunications wiring standard

ECMA 97: 1985,

Local Area Networks Safety Requirements

EIA/TIA TSB 36,

Technical systems bulletin additional cable specifications for unshielded twisted pair ca-

bles, November 1991

)

EIA/TIA TSB 40,

Technical systems bulletin additional transmission specifications for unshielded twisted

pair connecting hardware, 1992

EIA/TIA 574: 1990,

9 Position non-synchronous interface between data terminal equipment and data cir-

cuit-terminating equipment employing serial binary data interchange

IEC 60,

High-voltage test techniques

)

IEC 950: 1991,

Safety of information technology equipment, including electrical business equipment

ISO 8802-3: 1993,

Information technology – Local and metropolitan area networks– Part 3: Carrier

sense multiple access with collision detection (CSMA/CD) access method and physical layer specifica-

tions

———

)

Available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80111-5704.

)

Available from the American National Standards Institute, 11 West 42nd Street, New York, NY 10036.

ANSI X3.263-1995

ISO 8802-5: 1992,

Information processing systems – Local and metropolitan area networks – Part 5:

Token ring access method and physical layer specifications

ISO/IEC 8877:1992,

Information technology – Telecommunications and information exchange between

systems – Interface connector and contact assignments for ISDN Basic Access Interface located at refer-

ence points S and T

ISO 9314-1: 1989,

Information processing systems – Fibre Distributed Data Interface (FDDI) – Part 1:

Token Ring Physical Layer Protocol (PHY)

ISO 9314-2: 1989,

Information processing systems – Fibre Distributed Data Interface (FDDI) – Part 2:

Token Ring Media Access Control (MAC)

ISO/IEC 9314-3: 1990,

Information processing systems – Fibre Distributed Data Interface (FDDI) – Part

3: Token Ring Physical Layer, Medium Dependent (PMD)

ISO/IEC DIS 9314-6,

Information processing systems – Fibre Distributed Data Interface (FDDI) – Part 6:

Token Ring Physical Layer, Station Management (SMT)

3 Definitions

For the purposes of this standard, the following definitions apply. Other parts of FDDI, e.g., MAC and

PHY, may contain additional definitions of interest.

3.1 baseline wander: Data dependent variations in the low frequency component of a signal.

3.2 bypass: The ability of a station to isolate itself from the FDDI network while maintaining the continu-

ity of the cable plant.

3.3 code bit: The smallest signaling element used by the Physical Layer for transmission on the me-

dium.

3.4 concentrator: An FDDI node that has additional PHY/PMD entities beyond those required for its

own attachment to an FDDI network. These additional PHY/PMD entities are for the attachment of other

FDDI nodes (including other concentrators) in a tree topology.

3.5 connector plug: A device used to terminate a cable.

3.6 connector receptacle: The fixed or stationary half of a connection that is mounted on a

panel/bulkhead. Receptacles mate with plugs.

3.7 counter-rotating: An arrangement whereby two signal paths, one in each direction, exist in a ring

topology.

3.8 dual attachment concentrator: A concentrator that offers two attachments to the FDDI network

which are capable of accommodating a dual (counter-rotating) ring.

3.9 dual attachment station: A station that offers two attachments to the FDDI network which are ca-

pable of accommodating a dual (counter-rotating) ring.

3.10 dual ring (FDDI dual ring): Two FDDI rings that operate as (a pair of) counter-rotating logical

rings.

3.11 entity: An active service or management element within an Open Systems Interconnection (OSI)

layer, or sublayer.

3.12 fibre: Dielectric material that guides light; waveguide.

3.13 fibre optic cable: A cable containing one or more optical fibres.

3.14 interchannel isolation: The ability to prevent undesired energy from appearing in one signal path

as a result of coupling from another signal path.

ANSI X3.263-1995

3.15 jitter: The variation in synchronization between bits in the FDDI signaling bit stream.

3.16 jitter, data dependent (DDJ): Jitter that is related to the transmitted symbol sequence. DDJ is

caused by the limited bandwidth characteristics and imperfections in the channel components.

3.17 jitter, duty cycle distortion (DCD): Distortion usually caused by propagation delay differences

between low-to-high and high-to-low transitions. DCD is manifested as a pulse width distortion of the

nominal baud time.

3.18 jitter, random (RJ): RJ due to thermal noise may be modeled as a Gaussian process. Other

sources of RJ include external noise and crosstalk. The peak-peak value of RJ is probabilistic in nature.

3.19 TP-MIC plug: The male part of the TP-MIC that terminates a twisted pair cable.

3.20 TP-MIC receptacle: The female part of the TP-MIC which is contained in an FDDI node.

3.21 logical ring: The set of MACs serially connected to form a single ring.

3.22 media interface connector (MIC): A mated connector pair that provides an attachment between

an FDDI node and a cable plant. When referring to the original PMD’s MIC, the term MIC is used. When

referring to the TP-PMD MIC, the term TP-MIC is used. The TP-MIC consists of two parts; a TP-MIC plug

and a TP-MIC receptacle.

3.23 network (FDDI network): A collection of FDDI nodes interconnected to form a trunk, or a tree, or a

trunk with multiple trees. This topology is sometimes called a dual ring of trees.

3.24 node: A generic term applying to any FDDI ring attachment (station or concentrator).

3.25 original PMD: The first FDDI PMD standard developed that supports multi-mode fibre optic cable

with an 11dB loss budget and is known as ANSI X3.166.

3.26 physical connection: The full-duplex physical layer association between adjacent PHY entities (in

concentrators or stations) in an FDDI network, i.e., a pair of Physical Links.

3.27 physical link: The simplex path (via PMD and attached medium) from the transmit function of one

PHY entity to the receive function of an adjacent PHY entity (in concentrators or stations) in an FDDI net-

work.

3.28 primitive: An element of the services provided by one entity to another.

3.29 receiver (optical): An opto-electronic circuit that typically converts an optical signal to an electrical

logic signal.

3.30 ring: A set of stations wherein information is passed sequentially between stations, each station in

turn examining or copying the information, finally returning it to the originating station. In FDDI usage, the

term "ring" or "FDDI ring" refers to the dual (counter-rotating) ring.

3.31 services: The FDDI services provided by one FDDI entity to another. Data services are provided to

a higher layer entity; management services are provided to a management entity in the same or another

layer.

3.32 single attachment concentrator: A concentrator that offers one attachment to the FDDI network.

3.33 single attachment station: A station that offers one attachment to the FDDI network.

3.34 station: An addressable node on an FDDI network capable of transmitting, repeating, and receiv-

ing information. A station has exactly one SMT and at least one MAC, one PHY, and one PMD.

3.35 transmitter (optical): An opto-electronic circuit that typically converts an electrical logic signal to

an optical signal.

3.36 tree: A physical topology consisting of a hierarchy of master-slave connections between a concen-

trator and other FDDI nodes (including subordinate concentrators).

剩余79页未读，继续阅读

新加坡下雨了

粉丝: 7
资源: 4

ANSI X3.263-1995: FDDI TP-PMD标准详解

ieee802.3标准+ANSI-X3.263-1995

ANSI-X3.263-1995

ANSI-X3.263-1995.rar

ansi x3.263

/vendor/bin/php-cs-fixer fix --using-cache=no --diff --config=.php-cs-fixer.php --dry-run --allow-risky=yes --ansi 命令解释

c语言编译错误c267,为啥编译出现HAHA.C(31): error C267: 'DisplChar': requires ANSI-style prototype.......

c语言编译错误c267,为啥编译出现HAHA.C(31): error C267: 'adc0832': requires ANSI-style prototype.......

64服务器中丢失api-ms-win-core-kerne|32-legacy-ansi-|1-1-0.dll怎么解决

最新资源