DS level

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.
References in periodicals archive ?
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HMIS/MSDS Reporting Required R Terminal or Obsolete, Replaced Z Terminal or Obsolete, Not Replaced K D ITEM: Deport O/H & Maintenance Kits (Kit) F ITEM: Maintenance Kit, Place at O, F, H, L B ITEM: in both Depot Repair & Maint Kits M 0 MFG OR FAB at Unit Level (Manufacture) F MFG OR FAB at DS Level H MFG OR FAB at GS Level L MFG OR FAB at Special Repair Activity (SRA) G MFG OR FAB at Both Afloat and Ashore (Navy Only) D MFG OR FAB at Depot Maintenance Level A 0 ITEM: Assembled at Unit (Assembled) F ITEM: Assembled at DS Level H ITEM: Assembled at GS Level L ITEM: Assembled at SRA G ITEM: Assembled at Afloat and Ashore (Na Only) D ITEM: Assembled at Depot Maintenance Level X A ITEM: Requisition Next Higher Assembly (Not Stocked) B ITEM: Not Procured or Stocked.
9% had DS levels below the lower border of S2 (Fig.
The mean DS levels in the age groups 18-29, 40-49, 50-59 and 70-83 years were at the middle third of S2, while patients in the age groups 30-39 and 60-69 years showed a mean level in the upper third of S2.
9 at day 90 compared to control DS levels which started at 17.