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UID-marking is a set of data for assets that is globally unique and unambiguous. The technology used to mark an item is 2D Data Matrix ECC 200 Symbol. UID marking can be used to ensure data integrity and data quality throughout an item's lifecycle; it also supports multi-faceted business applications.
A Data Matrix on a Mini PCI card, encoding the serial number 15C06E115AZC72983004. The most popular application for Data Matrix is marking small items, due to the code's ability to encode fifty characters in a symbol that is readable at 2 or 3 mm 2 (0.003 or 0.005 sq in) and the fact that the code can be read with only a 20% contrast ratio. [1]
For items that are not subject to DFARS mandated marking, the Data Matrix ECC 200 symbol using ISO/IEC 15434 syntax and the semantics of ISO/IEC 15418 or ATA CSDD is preferred. Unless specified below, MH10.8.7 is the MRI marking protocol that should be used to mark all items. MIL-STD-130 compliant 2D matrix
When a 2D Symbol is used, the size of the part is not a relevant factor as the available marking area is reduced to below 1/4 inch square. Operating environment / age life It should be controlled, if the used marking method can survive in its intended environment and remain readable for the life cycle of the part.
AM—Active Matrix; AMOLED—Active-Matrix Organic Light-Emitting Diode; AM—Active Monitor; AM—Allied Mastercomputer; AM—Amplitude Modulation; AMD—Advanced Micro Devices; AMQP—Advanced Message Queuing Protocol; AMR—Audio Modem Riser; ANN—Artificial Neural Network; ANSI—American National Standards Institute; ANT—Another Neat Tool
The two main categories of ECC codes are block codes and convolutional codes. Block codes work on fixed-size blocks (packets) of bits or symbols of predetermined size. Practical block codes can generally be hard-decoded in polynomial time to their block length. Convolutional codes work on bit or symbol streams of arbitrary length.
Some ECC-enabled boards and processors are able to support unbuffered (unregistered) ECC, but will also work with non-ECC memory; system firmware enables ECC functionality if ECC memory is installed. ECC may lower memory performance by around 2–3 percent on some systems, depending on the application and implementation, due to the additional ...
The encoding process assumes a code of RS(N, K) which results in N codewords of length N symbols each storing K symbols of data, being generated, that are then sent over an erasure channel. Any combination of K codewords received at the other end is enough to reconstruct all of the N codewords.