ISO/IEC 8482:1993 PDF

Name: ISO/IEC 8482:1993 — Information technology — Telecommunications and information exchange between systems — Twisted pair multipoint interconnections
SKU: ISO/IEC 8482:1993
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Information technology — Telecommunications and information exchange between systems — Twisted pair multipoint interconnections

Название (английский):

ISO/IEC 8482:1993

Information technology — Telecommunications and information exchange between systems — Twisted pair multipoint interconnections

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 18
Дата публикации:: 23 декабря 1993 г.
Издание:: ISO/IEC IS 8482 edition 1 version 1
ICS:: 35.100.10

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Описание (английский):

Specifies the physical medium characteristics for twisted pair multipoint interconnections in either 2-wire or 4-wire network topology, a binary and bi-directional signal transfer, the electrical and mechanical design of the endpoint system branch cables and the common trunk cable which may be up to 1200 m in length, the component measurements of the integrated type generators and receivers within the endpoint system, the applicable data signalling rate up to 12,5 Mbit/s.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO/IEC 8482:1993 defines physical-medium characteristics for twisted-pair multipoint interconnections used in telecommunications and information exchange. The standard covers both 2‑wire and 4‑wire multipoint topologies, supporting binary, bi‑directional signalling for half‑duplex or duplex operation. It is a component‑level specification focusing on the electrical and mechanical design of endpoint branch cables and a common trunk cable (up to 1 200 m), plus the measurement requirements for integrated generators and receivers. The standard supports signalling rates up to 12.5 Mbit/s and references ITU‑T Recommendation V.11 for point‑to‑point characteristic alignment.

Key topics and technical requirements

Physical medium: Balanced twisted‑pair trunk and branch cables; trunk may be up to 1 200 m, branch cables recommended ≤ 1 m.

Topologies: Two‑wire (usually half‑duplex) and four‑wire (half‑duplex or duplex) multipoint configurations.

Electrical limits:

Binary, bi‑directional signal transfer with well‑defined generator and receiver characteristics.
Component measurements of integrated circuit‑type generators and receivers; measurement points and procedures follow ITU‑T V.11 conventions.
Trunk cable termination: termination resistor at each end (120 Ω mentioned in context).

Unit Load (UL): A hypothetical UL defines DC loading for endpoint systems (example currents and methods are specified so that the sum of ULs does not exceed 32.0). Measurement ranges include voltages from –7 V to +12 V and small‑signal current bounds (examples given like –0.8 mA to +1.0 mA for 1.0 UL).

Shielding and grounding: Balanced cables may be shielded; connector and grounding practices are addressed (shield optional; trunk shield normally grounded at one place).

Scope limits: ISO/IEC 8482 does not define functional signalling encodings, connector pin assignments, or environmental constraints (EMI, galvanic isolation) - these may be covered in other standards or amendments.

Practical applications and users

Who uses this standard:

Network and telecom equipment designers (DTE/DCE interface hardware)

Cable and connector manufacturers producing multipoint twisted‑pair assemblies

System integrators and installers designing multipoint LAN/WAN links or industrial bus systems

Test labs validating generator/receiver characteristics and UL loading

Typical applications:

Multipoint local or wide area networks using twisted pair as a shared medium

Industrial or building control networks that require a shared trunk with multiple endpoints

Legacy multipoint bus topologies where electrical interoperability and defined loading are critical

Related standards

ITU‑T Recommendation V.11 (electrical characteristics for balanced double‑current interchange circuits) - normative reference used for component measurement alignment.

Earlier edition: ISO/IEC 8482:1987 (superseded).

Keywords: ISO/IEC 8482, twisted pair multipoint interconnections, two‑wire, four‑wire, trunk cable, termination resistor, unit load (UL), ITU‑T V.11, 12.5 Mbit/s, balanced interchange circuit.

ISO/IEC 8482:1993 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

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