A CDE Definition
(1) (GENeration 1) The first version of a product.
(2) The first air interface for communication between an RFID reader and tag. See Gen 2.
(1) (GENeration 2) The second version of a product.
(2) The second generation air interface for communication between an RFID reader and tag, administered by GS1 EPCglobal (www.gs1.org). It deals with the modulation scheme, packet structure, command language and methods for dealing with collision.
Ratified in 2005, Gen 2 was a major enhancement that standardized on a single data link protocol and included support for worldwide spectrum regulations. It added read/write and tag disable functions, interoperability between devices and the ability for readers to work in close proximity to each other. See RFID and EPC.
Tags were given class numbers before Gen 2 was introduced and before the term Gen 1 was coined to refer to the earlier tags and protocols. Although Gen 1 tags are expected to fade into history, there were numerous articles written that mention them. Following is an approximate summary.
Gen 1 Type Bits Features
Class 0 P 64-96 Read only, Locked*
Class 0+ P 64-96 R/W and WORM
Class 1 P 64-96
Gen 2 (All classes can be locked)
Class 1 P 96-496 Commonly used
Class 2 P 96-496 Authentication
Class 3 SP 96-496 Integrated sensing
Class 4 A 96-496 Ad hoc networking
P=passive; SP=semi-passive; A=active
RO=read only; R/W=rewritable
WORM=write once read many
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