What is a T1 DS1?

Answer 1

A DS1 is a telecommunications standard used in North America, Japan, South Korea and some Pacific islands and territories. The term stands for 'Digital Signal [level] 1.' A T1 is the actual 4-wire circuit used to transport the DS1 signal, and the two terms are often used interchangeably. A DS1 signal is part of the [North American] Time-Division Multiplexing heirarchy, and operates at a speed of 1.544 Mbps (Megabits per second), including 8 kbps (kilobits per second) of framing bits. The signal is comprised of 24 timeslots of 64 kbps DS0 (DS-'zero') channels. The DS0 is the most basic unit of the TDM heirarchy, and can be considered the equivalent of a regular voice phone line (56 kbps + 8 kbps of signalling) or a digital line (of 64 kbps), so a DS1 can be said to contain the equivalent of 24 phone lines on one 4-wire circuit. The T1 circuit uses a separate transmit pair (2 wires) and a receive pair (2 wires) and operates at the effective speed of 1.544 Mbps in both directions simultaneously.

Answer 2

T1 = DS1 they are the same thing.