Black Box Version 1.0 user manual Idsl in brief, High bit rate DSL Hdsl technology, Standard

4.1.2.1 IDSL in brief

Standard

•T1.601

•interoperability between equipment of different manufacturers at the U interface layer

Transmission rate

•up to 144 Kbit/s

•up to 64 Kbit/s + voice channel in NTU-128 Voice

Line code

•2B1Q

Transmission medium

•one pair

•possibility of the regenerator’s installation

Usage

•PNOs and providers of Internet services

•commercial operators

•integration of LANs

Restrictions

•low speed

•impossibility of transmission rate adjusting

4.1.3 High bit rate DSL (HDSL) technology

The HDSL technology allows transmitting synchronous digital data at 1.54- or 2.048-Mbit/s speed over two copper pairs. This standard was accepted by European Telecommunication Standards Institute. 2B1Q or CAP 64 are used as line codes. The data transmission rate over each pair is 1168 Kbit/s, the decrease of linear rate is not provided. The 2B1Q encoding HDSL technology allows to connect up to 3 remotely powered regenerators.

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