DS-1 is a communications protocol for multiplexing the bitstreams of up to 24 telephone calls, along with two special bits: a framing bit (for frame synchronization) and a maintenance-signaling bit, transmitted over a digital circuit called T1.

In the telecommunications system, the first (and still common) STDM lines are the T-carrier hierarchy (at least in the US; the E1,etc hierarchy is used in Europe). The designation T1 describes the hardware level; the designation DS1 (for Data Stream) represents the logical signaling level. At the bit level, B8ZS signaling is used.

DS1 is a digital signal level that is part of a standardized hierarchy or building blocks of digital services for TDM (Time Division Multiplexing) digital lines. A DS1 is a DS1 regardless of whether it is delivered on a T1 line, a microwave relay, a T3 line or a fiber optic carrier.

When a 1 is sent one line (tip, for example) will be a positive voltage and the other (ring, for example) will be a negative voltage. When 0's are begin sent, both lines are at 0 volts. Since T1 is AMI or alternating, the next 1 will have the voltages reversed.

The DS-1 cell line was established from cells in the pleural effusion from an immunodeficient patient with intestinal lymphangiectasia.

Digital Signal Designation is the classification of digital bit rates in the digital multiplex hierarchy used in transport of signals from one location to another in telecommunications. The DS technically refers to the rate and format of the signal, while the T designation refers to the equipment providing the signals.

Digital signal 1 or DS1, also known as T1, sometimes "DS-1" is and are actually the same thing: They are a T-carrier signaling scheme devised by Bell Labs. DS1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices.

2017年1月30日 · Digital Signal Level 1 (DS1) provides clean digital signals, free of cross talk, distortion and amplified noise. DS1 is a point-to-point high capacity Private Line digital transport service that provides transmission of isochronous serial data at 1.544 Megabits (Mbps) and has the capacity of 24 voice equivalent channels.

One of the most common access services for business is T1 in North America and E1 in Europe/Asia. This paper describes how data are carried in these T1/E1 lines, specifically the framing and line codes used in these circuits. Note that I …

2012年2月13日 · Notice one DS-1 line is the equivalent of 24 DS0 64 Kbps DS-0 voice channels. Also notice that one DS-2 line is the equivalent of 4 DS-1 lines or 96 DS-0 voice channels. Copper wire pairs can be used to transmit at levels up to DS-2.