DS1

Domain	Definition
Computing	DS1 A DS level and framing specification for synchronous digital streams, over circuits in the North American digital transmission hierarchy, at the T1 transmission rate of 1544000 bits per second (baud). In the US a DS1 "frame" is composed of 24 eight-bit bytes (commonly from 24 DS0 sources, originally digitised voice-grade telephone signals), plus one framing bit (193 bits). 8000 bytes per second come from each source, and thus 8000 frames per second are transported by the DS1 signal. The result is 1938000 = 1,544,000 bits per second. In the original standard, the framing bits continuously repeated the sequence 110111001000, and such a 12-frame unit is called a super-frame. In voice telephony, errors are acceptable (early standards allowed as much as one frame in six to be missing entirely), so the least significant bit in two of the 24 streams was used for signaling between network equipments. This is called robbed-bit signaling. To promote error-free transmission, an alternative called the extended super-frame (ESF) of 24 frames was developed. In this standard, six of the 24 framing bits provide a six bit cyclic redundancy check (CRC-6), and six provide the actual framing. The other 12 form a virtual circuit of 4000 bits per second for use by the transmission equipment, for call progress signals such as busy, idle and ringing. DS1* signals using ESF equipment are nearly error-free, because the CRC detects errors and allows automatic re-routing of connections. Compare T-carrier systems. [Kenneth Sherman, "Data Communications : a user's guide", third edition (1990), Reston/Prentice-Hall/Simon & Schuster]. (1996-03-30). Source: The Free On-line Dictionary of Computing.
Source: compiled by the editor from various references; see credits.

Abbreviations & Acronyms: DS1

The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted.
Entry	Source	Expression	Field
DS1	English	Fast Flux irradiations of mixed oxide fuel pins with Hebonding carried out in the DFR	N/A
Source: compiled by the editor, based on several corpora (additional references).

Commercial Usage: DS1

Domain	Title
High Tech	Paradyne 9162 2-Slot Housing with T1 Nam Ds1 120V Ac Console & T1 Cables (reference) (more camera examples; more video game examples; more computer examples; more electronic examples; more software examples)
Source: compiled by the editor from various references; see credits.

Usage Frequency: DS1

"DS1" is generally used as an unclassified items -- approximately 100.00% of the time. "DS1" is used about 3 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted)

Frequency of Internet Keywords: DS1

Alternative Orthography: DS1

Hexadecimal (or equivalents, 770AD-1900s) (references)

44 53 31

Leonardo da Vinci (1452-1519; backwards) (references)

Binary Code (1918-1938, probably earlier) (references)

01000100 01010011 00110001

HTML Code (1990) (references)

&#68 &#83 &#49

ISO 10646 (1991-1993) (references)

0044 0053 0031

Encryption (beginner's substitution cypher): (references)

Parts of Speech	Percent	Usage per 100 Million Words	Rank in English
Unclassified Items	100%	3	202,518

Expression	Frequency per Day	Expression	Frequency per Day
ds1	35	ds1 moab	3
ds1 los angeles	12	ds1 native wdm yamaha	3
ds1 giant warp	10	ds1 formatter	3
driver ds1 native wdm yamaha	10	ds1 wire wrap	3
yamaha ds1	7	ds1 native yamaha	2
boss ds1	5	ds1 legacy wdm yamaha	2
ds1 moab schwinn	5	cleveland ds1	2
ds1 giant	5	driver ds1 legacy yamaha	2
driver ds1 yamaha	4	proxima ultralight ds1	2
arnold ds1	4	boss ds1 mods	2
driver ds1 legacy wdm yamaha	4	ds1 legacy yamaha	2
ds1 warp	4	14 15454 ds1	2
		driver ds1 xp yamaha	2
Source: compiled by the editor from various references; see credits.

DS1

Specialty Definition: DS1

Abbreviations & Acronyms: DS1

DS1

Crosswords: DS1