ds level

1 definition found

ds level - Free On-line Dictionary of Computing (26 May 2007) :

  DS level
  
     <communications> (Digital Signal or Data Service level)
     Originally an AT&T classification of transmitting one or
     more voice conversations in one digital data stream.  The best
     known DS levels are DS0 (a single conversation), DS1 (24
     conversations multiplexed), DS1C, DS2, and DS3.
  
     By extension, the DS level can refer to the raw data rate
     necessary for transmission:
  
      DS0      64 Kb/s
      DS1   1.544 Mb/s
      DS1C  3.15  Mb/s
      DS2   6.31  Mb/s
      DS3  44.736 Mb/s
      DS4 274.1   Mb/s
  
     (where K and M signify multiplication by 1000 and 1000000,
     rather than powers of two).  In this sense it can be used to
     measure of data service rates classifying the user access
     rates for various point-to-point WAN technologies or
     standards (e.g. X.25, SMDS, ISDN, ATM, PDH).
  
     Japan uses the US standards for DS0 through DS2 but Japanese
     DS5 has roughly the circuit capacity of US DS4, while the
     European standards are rather different (see E1).  In
     the US all of the transmission rates are integral multiples of
     8000 bits per second but rates above DS1 are not necessarily
     integral multiples of 1,544 kb/s.
  
     (1998-05-18)