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4.1.4 EXTRAns technology
xDSL solutions are widely used for the organization of interstation trunk lines, creation of routes
for multiplexers and routers. But the wide spread of analog systems with frequency division
multiplexing/demultiplexing of the K-60, K-24, K-12 types makes it difficult to use standard xDSL
solutions over backbone (trunk lines)
and zone cables of the different types with the wire
diameter of 0.9–1.2, if one of the analog systems works over cables. To digitalize local and zone
lines, NTC NATEKS engineered the EXTRAns technology based on asymmetric adaptive
multimode CAP modulation with a regulated level. This technology allows transmitting
synchronous digital stream with a changeable line speed from 144 to 2064 Kbit/s over two copper
pairs. The technology stipulates the installation of up to 6 remotely powered regenerators. The
number of regenerators can be doubled if they are remotely powered from two-manned repeater
station, where power source is available.
4.1.4.1 EXTRAns in brief
Standard
• Patent № 2001104235/20(004956) of the Federal Institute of Industrial Property
• interoperability with the equipment of other manufacturers is not provided
Transmission rate
• 144–2064 Kbit/s
Line code
• CAP-EXTRAns
Transmission medium
• two pairs
• possibility of the regenerator’s installation (up to 6)
Usage
• PNOs, Competitive Local Exchange Carriers (CLECs)
• creation of long-haul digital routes with many regenerating segments
• organization of trunk lines between PABX
• increase of capacity of subscribers’ lines with the help of Digital Loop Carrier systems
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