EPC Tag Data Standard Version 1.1 Contd…

DOD has defined 2 identity types which can be used by its suppliers. Following are the 2 identity types defined by DOD…
1. DoD-64 Identity Type
This type has 64 bits of information stored in it. Following is the breakup of the information
Header: 8 bits -> specifies that the tag data is encoded as a DoD 64-bit tag construct, use binary
number 1100 1110.
Filter : 2 bits -> identifies a pallet, case, or UID item associated with tag, represented in binary
number format using the following values: 00 = pallet, 01=case, 10=UID item, 11=reserved
Government managed id: 30 bits -> Cage code
Serial id: 24bits

2. DoD-96 Identity Type
DOD 96 bit tag has following fields
Header: 8 bits -> specifies that the tag data is encoded as a DoD 96-bit tag construct, use binary 0010 1111.
Filter : 4 bits -> identifies a pallet, case, or UID item associated with tag, represented in binary number format using the following values: 0000 = pallet, 0001=case, 0010=UID item, others=reserved
Government managed id: 48 bits -> Cage code
Serial id: 36bits -> Uniquely identifies up to 236 = 68,719,476,736 tagged items

Next we will look at the Encoding layer…

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