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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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