Nokia 6800 Series - Manual (Page 50)

6800/7000 Series - Distribution and Routing Products Installation and Operation Manual 23
Chapter 3
EDH-6800-2 EDH Detection/Insertion
Serial Distribution Amplifier Module
Overview
The EDH-6800-2 is a versatile serial distribution amplifier that also
functions as a digital video Error Detection and Handling (EDH) check
word analyzer and decoder. As a distribution amplifier, it provides
equalization and reclocking to eight serial outputs. As an EDH analyzer/
inserter, it can detect errors on input signals that contain EDH
information and/or insert EDH into signals where it does not already
exist.
The EDH-6800-2 functions with composite (143 Mb/s), component
(270 Mb/s), and the proposed 16:9 (360 Mb/s) standards.
With EDH recognized as a method of verifying serial signals for
impairments, the EDH-6800-2 offers a compact and cost-effective way
of monitoring EDH in serial links without using expensive laboratory
analyzers. It also provides the means to “inject” EDH check words into
serial digital video signal paths. With its eight equalized and reclocked
outputs, the EDH-6800-2 can also be used within a system in place of a
serial distribution amplifier, with the added benefit of EDH.
Controls and indicators provide a comprehensive set of analysis
functions. With them, EDH encoding on the output signal can be turned
on or off and input presence and status are indicated. An on-board
audible alarm can be enabled to alert the user to input signal EDH errors
and an opto-isolated “contact-to-ground” signal can be used to interface
to any external fault warning system.
Specifications and designs are subject to change without notice.
EDH analysis is not currently
available for 360 Mb/s mode.