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• high-speed access to SDH networks
Restrictions
• two pairs are used for full stream transmission
4.1.5 Multispeed DSL (MDSL) technology
The term SDSL was used for several years on the market. It was referred to all solutions meant
for the synchronous digital stream transmission over one pair. This technology supports the
possibility of line speed regulation over long-haul distances. The technology is implemented in
MDSL and MSDSL, the latter one having a different line code. The MDSL technology uses 2B1Q
line code. The transmission rate varies from 144 to 2320 Kbit/s. Regenerators are not used here.
4.1.5.1 MDSL in brief
Standard
• ETSI TS 101 135
• interoperability between equipment of different manufacturers at the level of DSL chips
Transmission rate
• 144–2320 Kbit/s
Line code
• 2B1Q
Transmission medium
• one pair
• impossibility of the regenerator’s installation
Usage
• Internet service providers
• access to Internet
• integration of LANs
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