DS1 - ορισμός. Τι είναι το DS1
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Τι (ποιος) είναι DS1 - ορισμός

WIKIMEDIA DISAMBIGUATION PAGE
DS-1; Ds 1; DS1 (disambiguation)

DS1         
Digital Signal level 1 (Reference: ISDN, T1), "Style: DS-1"
DS1         
<communications> 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 1,544,000 bits per second (baud). DS1 is commonly used to multiplex 24 DS0 channels. Each DS0 channel, originally a digitised voice-grade telephone signal, carries 8000 bytes per second (64,000 bits per second). A DS1 frame includes one byte from each of the 24 DS0 channels and adds one framing bit, making a total of 193 bits per frame at 8000 frames per second. The result is 193*8000 = 1,544,000 bits per second. In the original standard, the successive framing bits continuously repeated the 12-bit 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)
Digital Signal 1         
TELEPHONE TRANSMISSION CARRIER SYSTEM IN USA AND CANADA
T1 line; Digital signal 1; T1/E1; T1/PRI; T-span; Yellow alarm; Blue alarm; T1(Networking); DS1C; T1 circuit
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. DS1 is the primary digital telephone standard used in the United States, Canada and Japan and is able to transmit up to 24 multiplexed voice and data calls over telephone lines.

Βικιπαίδεια

DS1

DS1 or DS-1 may refer to:

  • BOSS DS-1, a guitar distortion pedal
  • Digital Signal 1, a T-carrier signaling scheme devised by Bell Labs
  • Deep Space 1, a mission to 9969 Braille & 19P/Borrelly
  • DS-1 (drug), a selective GABAA α4β3δ agonist drug
  • South African Class DS1, a diesel locomotive class
  • Datsun DS-1, a car by Nissan, see Datsun DS Series
  • Dark Souls, an action role-playing game
  • Dead Space (2008 video game), a survival horror game
  • VR Class Ds1, a Finnish railbus class