CDR

(1) See CD-R and extension.

(2) (Call Detail Reporting) See call accounting.

(3) (Common Data Rate) A standard sampling rate for digital video for 480i and 576i systems. The rate is 13.5 MHz. See ITU-R BT.601 and CIF.

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1.		CDR - Committed Data Rate
2.	(programming)	cdr - /ku'dr/ or /kuh'dr/ The LISP operation that returns the right-hand node of a binary tree structure. In the typical case where the tree is used to store a list, the cdr is the tail of the list, i.e. all but the first element. The instruction format of the IBM 7090 that hosted the original LISP implementation featured two 15-bit fields called the "address" and "decrement" parts. The term "cdr" was originally "Contents of Decrement part of Register". Similarly, "car" stood for "Contents of Address part of Register".