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What (who) is High bit-rate Digital Subscriber Line - definition

HDSL2; High bit rate Digital Subscriber Line 2; High bit rate digital subscriber line 4; HDSL4; High bit rate digital subscriber line 2

High-bit-rate digital subscriber line

TELECOMMUNICATIONS PROTOCOL STANDARDIZED IN 1994, DEVELOPED TO TRANSPORT DS1 SERVICES AT 1.544 MBIT/S AND 2.048 MBIT/S OVER TELEPHONE LOCAL LOOPS WITHOUT A NEED FOR REPEATERS

HDSL; High Data Rate Digital Subscriber Line; High data rate Digital Subscriber Line; G.991.1; High bit rate Digital Subscriber Line; ITU G.991.1; High bit rate digital subscriber line; ITU-T G.991.1

High-bit-rate digital subscriber line (HDSL) is a telecommunications protocol standardized in 1994. It was the first digital subscriber line (DSL) technology to use a higher frequency spectrum over copper, twisted pair cables.

https://en.wikipedia.org/wiki/High-bit-rate_digital_subscriber_line

High-bit-rate digital subscriber line 2

High-bit-rate digital subscriber line 2 (HDSL2) is a standard developed by the American National Standards Institute (ANSI) Committee T1E1.4 and published in 2000 as ANSI T1.

https://en.wikipedia.org/wiki/High-bit-rate_digital_subscriber_line_2

High bit-rate Digital Subscriber Line

<communications, protocol> (HDSL) A form of {Digital Subscriber Line}, providing T1 or E1 connections over two or three twisted-pair copper lines, respectively. Unlike most other forms of DSL HDSL is not a typical consumer service, it's used mostly to replace traditional T1/E1 connections, such as connecting PBXes to telco offices. The advantage of HDSL over the Alternate Mark Inversion line coding scheme traditionally used on T1/E1 lines is that it requires about an order of magnitude lower bandwidth to carry the same traffic. (1998-05-18)

Wikipedia

High-bit-rate digital subscriber line 2

High-bit-rate digital subscriber line 2 (HDSL2) is a standard developed by the American National Standards Institute (ANSI) Committee T1E1.4 and published in 2000 as ANSI T1.418-2000. Like its predecessor HDSL, HDSL2 provides a symmetric data rate of 1,544 kbit/s in both the upstream and downstream directions at a noise margin of 5-6 dB. Its primary purpose was also to provision a T-1 line, only this technology relies on fewer wires - two instead of four - and therefore costs less to set up. The modulation technique used in HDSL2 is TC-PAM, which is also used in G.SHDSL, as opposed to 2B1Q in HDSL. Spectral shaping is applied to increase compatibility with ADSL and HDSL2 on the same bundle. HDSL4 provides the same bitrate as HDSL2, but uses four wires instead of two, to increase robustness. On an AWG26 local loop, the reach of HDSL2 is 9,000 feet (2.7 km), while that of HDSL4 is 11,000 feet (3.4 km).

https://en.wikipedia.org/wiki/High-bit-rate digital subscriber line 2

Examples of use of High bit-rate Digital Subscriber Line

1. The Bonn–based regulator argued in October that VDSL, very high bit rate digital subscriber line, was a new product that should be free from regulation, as it was impossible to tell what services it might spawn.