Hdmi 1.4; Power Button Led Behavior - Dell Vostro 3401 Service Manual

HDMI 1.4

This topic explains the HDMI 1.4 and its features along with the advantages.
HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI
provides an interface between any compatible digital audio/video source, such as a DVD player, or A/V receiver and a
compatible digital audio and/or video monitor, such as a digital TV (DTV). The primary advantage is cable reduction and content
protection provisions. HDMI supports standard, enhanced, or high-definition video, plus multichannel digital audio on a single
cable.
HDMI 1.4 Features
● HDMI Ethernet Channel - Adds high-speed networking to an HDMI link, allowing users to take full advantage of their IP-
enabled devices without a separate Ethernet cable.
● Audio Return Channel - Allows an HDMI-connected TV with a built-in tuner to send audio data "upstream" to a surround
audio system, eliminating the need for a separate audio cable.
● 3D - Defines input/output protocols for major 3D video formats, paving the way for true 3D gaming and 3D home theater
applications.
● Content Type - Real-time signaling of content types between display and source devices, enabling a TV to optimize picture
settings based on content type.
● Additional Color Spaces - Adds support for additional color models used in digital photography and computer graphics.
● 4K Support - Enables video resolutions far beyond 1080p, supporting next-generation displays that will rival the Digital
Cinema systems used in many commercial movie theaters.
● HDMI Micro Connector - A new, smaller connector for phones and other portable devices, supporting video resolutions up
to 1080p.
● Automotive Connection System - New cables and connectors for automotive video systems, designed to meet the unique
demands of the motoring environment while delivering true HD quality.
Advantages of HDMI
● Quality HDMI transfers uncompressed digital audio and video for the highest, crispest image quality.
● Low-cost HDMI provides the quality and functionality of a digital interface while also supporting uncompressed video
formats in a simple, cost-effective manner.
● Audio HDMI supports multiple audio formats from standard stereo to multichannel surround sound.
● HDMI combines video and multichannel audio into a single cable, eliminating the cost, complexity, and confusion of multiple
cables currently used in A/V systems.
● HDMI supports communication between the video source (such as a DVD player) and the DTV, enabling new functionality.

Power button LED behavior

On certain Dell Latitude systems, the power button LED is used to provide an indication of the system status, and as a result the
power button illuminates when pressed. The systems with the optional power button/fingerprint reader will have no LED under
the power button and hence will apply the available LED's in the system to provide an indication of the system status.
Power button LED behavior without Fingerprint reader
● System is ON (S0) = LED illuminates solid white.
● System in Sleep/Standby (S3, SOix) = LED is off
● System is Off/Hibernating (S4/S5) = LED is off
Power On and LED behavior with Fingerprint reader
● Pressing the power button for a duration between 50 msec to 2 sec turns on the device.
● Power button does not register additional presses until the SOL (Sign-Of-Life) has been provided to the user.
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