ISO/IEC 14908-2:2012

Information technology -- Control network protocol -- Part 2: Twisted pair communication

ISO/IEC 14908-2:2011 specifies the control network protocol (CNP) free-topology twisted-pair channel for networked control systems in local area control networks and is used in conjunction with ISO/IEC 14908-1. The channel supports communication at 78,125 kbit/s between multiple nodes, each of which consists of a transceiver, a protocol processor, an application processor, a power supply and application electronics.
ISO/IEC 14908-2:2011 covers the complete physical layer (OSI Layer 1), including the interface to the Media Access Control (MAC) sublayer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified.

General Information

• Status: Published
• Publication Date: 13-Feb-2012
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 35.200 - Interface and interconnection equipment
• ICS: 35.240.99 - IT applications in other fields
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Current Stage: CAN - Draft cancelled
• Start Date: 15-Dec-2011
• Completion Date: 21-Nov-2011

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 14908-2
First edition
2012-02-15


Information technology — Control
network protocol —
Part 2:
Twisted pair communication
Technologies de l'information — Protocole de réseau de contrôle —
Partie 2: Communication de pair torsadée





Reference number
ISO/IEC 14908-2:2012(E)
©
ISO/IEC 2012

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ISO/IEC 14908-2:2012(E)

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©  ISO/IEC 2012
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ii © ISO/IEC 2012 — All rights reserved

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14908-2 © ISO/IEC:2012 (E) - 2 -
Contents
Introduction .5
1 Scope. 7
2 Normative references. 7
3 Network overview . 7
4 System specifications. 7
4.1 General aspects. 7
4.2 Cable. 8
4.3 Topology . 8
4.3.1 Free or bus topology. 8
4.3.2 Repeater . 8
4.4 Cable Termination . 8
4.4.1 Free-topology segment . 8
4.4.2 Bus topology segment. 8
4.5 Segment configuration. 9
4.6 Power specifications. 9
5 Link power . 9
5.1 General . 9
5.2 Source . 10
5.3 Power supply requirements. 10
5.4 Passive coupler circuit. 13
6 Node specifications. 14
6.1 Link power . 14
6.2 Hot plugging . 14
6.3 Transmitter/receiver interface to the MAC sub-layer. 14
6.3.1 Physical layer protocol data unit. 14
6.3.2 Frame format.
...