EN 50157-2-1:1998
(Main)Domestic and similar electronic equipment interconnection requirements: AV.link - Part 2-1: Signal quality matching and automatic selection of source devices
Domestic and similar electronic equipment interconnection requirements: AV.link - Part 2-1: Signal quality matching and automatic selection of source devices
This standard specifies an extension (with the possibility to start with only two devices as a point-to-point interconnection (only a Display unit combined with a low end VTR) and than building it up) towards a chain configuration (serial interconnection of devices) with respect to the existing CENELEC standard EN 50049-1 which specifies only the characteristics of the point-to-point interconnection system for audiovisual equipment. This standard defines the interconnection characteristics of peritelevision devices which are configured in the chain principle. This standard makes use of a control signal at contact 10 which gives the possibility for automatic source de-selection and quality matching of AV-signals. This standard describes the AVC-signals in line with EN 50049-1. This standard gives system and device oriented requirements which have to be fulfilled if use is made of the logo related to this standard to ensure the customer a certain signal quality is achieved. The AV.link logo is defined in EN 50157-1. This standard gives the possibility to have a bi-directional interconnection of Y/C signals. This standard gives the possibility to have a bi-directional control of the aspect ratio of 16:9 and 4:3
Kennwerte für die Kleinsignalverbindung zwischen elektronischen Geräten für den Heimgebrauch und ähnliche Anwendungen: AV.link - Teil 2-1: Qualitatives Anpassen von Signalen und automatisches Auswählen von Signalquellen
Spécification des interconnexions des équipements électroniques domestiques et à usage analogue: AV.link - Partie 2-1: Adaptation de la qualité du signal et sélection automatique des équipements sources
Domestic and similar electronic equipment interconnection requirements: AV.link -- Part 2-1: Signal quality matching and automatic selection of source devices
General Information
- Status
- Published
- Publication Date
- 23-Aug-1998
- Technical Committee
- CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
- Drafting Committee
- IEC/TC 100 - IEC_TC_100
- Parallel Committee
- IEC/TC 100 - IEC_TC_100
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 28-Sep-2022
- Completion Date
- 21-Jan-2026
Overview
EN 50157-2-1:1998 (CLC) defines extensions to the AV.link interconnection system for domestic and similar electronic equipment, focusing on signal quality matching and automatic selection of source devices. Building on the point-to-point characteristics in EN 50049-1, this part enables a chain (serial) configuration of peritelevision devices and specifies system- and device-level requirements for reliable AV.link operation and use of the AV.link logo.
Key topics and requirements
- Chain configuration (serial interconnection): Allows devices to be interconnected in a chain (not just point-to-point), starting from a minimal point-to-point pairing (e.g., Display + low-end VTR) and scaling to multi-device chains.
- Control signal (contact 10): Defines use of a control line for automatic source de-selection and signal quality matching between devices - enabling devices to negotiate and select the optimal AV source automatically.
- AVC signal compatibility: Describes AVC (audio/video control) signal behaviour consistent with EN 50049-1 to ensure backward compatibility with existing point-to-point specifications.
- Bi-directional Y/C interconnection: Provides for two-way transmission of Y/C (luminance/chrominance) signals between devices when supported.
- Aspect ratio control: Supports bi-directional control for display aspect ratios 16:9 and 4:3, allowing source and display devices to coordinate presentation format.
- Logo and quality assurance: Specifies system and device requirements that manufacturers must meet if claiming conformance with the AV.link logo; the logo specification is defined in EN 50157-1.
Practical applications
- Consumer AV equipment interoperability in home entertainment systems
- Serially connected peritelevision device chains (e.g., set-top boxes, VTRs, displays)
- Automated source switching in AV racks, media centers, and integrated living-room systems
- Ensuring consistent Y/C signal handling and aspect-ratio coordination between legacy and modern devices
- Product certification and marketing using the AV.link logo to signal a guaranteed level of signal quality and automatic control features
Who should use this standard
- Consumer electronics manufacturers (TVs, VTRs, set-top boxes)
- AV system integrators and designers implementing chained device topologies
- Certification bodies and compliance engineers verifying AV.link logo claims
- Firmware and hardware designers implementing control-signal logic (contact 10) and aspect-ratio handling
Related standards
- EN 50049-1 - Point-to-point AV interconnection characteristics (baseline AVC signals)
- EN 50157-1 - AV.link logo definition and logo-related requirements
For implementation or certification, consult the full EN 50157-2-1:1998 text and EN 50157-1 for logo rules and conformance testing.
Frequently Asked Questions
EN 50157-2-1:1998 is a standard published by CLC. Its full title is "Domestic and similar electronic equipment interconnection requirements: AV.link - Part 2-1: Signal quality matching and automatic selection of source devices". This standard covers: This standard specifies an extension (with the possibility to start with only two devices as a point-to-point interconnection (only a Display unit combined with a low end VTR) and than building it up) towards a chain configuration (serial interconnection of devices) with respect to the existing CENELEC standard EN 50049-1 which specifies only the characteristics of the point-to-point interconnection system for audiovisual equipment. This standard defines the interconnection characteristics of peritelevision devices which are configured in the chain principle. This standard makes use of a control signal at contact 10 which gives the possibility for automatic source de-selection and quality matching of AV-signals. This standard describes the AVC-signals in line with EN 50049-1. This standard gives system and device oriented requirements which have to be fulfilled if use is made of the logo related to this standard to ensure the customer a certain signal quality is achieved. The AV.link logo is defined in EN 50157-1. This standard gives the possibility to have a bi-directional interconnection of Y/C signals. This standard gives the possibility to have a bi-directional control of the aspect ratio of 16:9 and 4:3
This standard specifies an extension (with the possibility to start with only two devices as a point-to-point interconnection (only a Display unit combined with a low end VTR) and than building it up) towards a chain configuration (serial interconnection of devices) with respect to the existing CENELEC standard EN 50049-1 which specifies only the characteristics of the point-to-point interconnection system for audiovisual equipment. This standard defines the interconnection characteristics of peritelevision devices which are configured in the chain principle. This standard makes use of a control signal at contact 10 which gives the possibility for automatic source de-selection and quality matching of AV-signals. This standard describes the AVC-signals in line with EN 50049-1. This standard gives system and device oriented requirements which have to be fulfilled if use is made of the logo related to this standard to ensure the customer a certain signal quality is achieved. The AV.link logo is defined in EN 50157-1. This standard gives the possibility to have a bi-directional interconnection of Y/C signals. This standard gives the possibility to have a bi-directional control of the aspect ratio of 16:9 and 4:3
EN 50157-2-1:1998 is classified under the following ICS (International Classification for Standards) categories: 33.160.30 - Audio systems; 33.160.40 - Video systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 50157-2-1:1998 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-1999
Domestic and similar electronic equipment interconnection requirements: AV.link -
- Part 2-1: Signal quality matching and automatic selection of source devices
Domestic and similar electronic equipment interconnection requirements: AV.link -- Part
2-1: Signal quality matching and automatic selection of source devices
Kennwerte für die Kleinsignalverbindung zwischen elektronischen Geräten für den
Heimgebrauch und ähnliche Anwendungen: AV.link -- Teil 2-1: Qualitatives Anpassen
von Signalen und automatisches Auswählen von Signalquellen
Spécification des interconnexions des équipements électroniques domestiques et à
usage analogue: AV.link -- Partie 2-1: Adaptation de la qualité du signal et sélection
automatique des équipements sources
Ta slovenski standard je istoveten z: EN 50157-2-1:1998
ICS:
33.160.40 Video sistemi Video systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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