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• creation of trunk lines between PABX
• increase of capacity of subscribers’ lines with the help of Digital Loop Carrier systems
• high-speed access to SDH networks
Restrictions
• absence of compatibility with the equipment of other manufacturers
• interference with other xDSL services
4.1.7 G.shdsl technology
The G.shdsl technology was engineered as a universal technology of synchronous digital data
transmission. It became an international standard for symmetric systems. The technology
supports the transmission over one and two pairs. Special stress, while developing the
technology, was laid to provide spectral compatibility with other technologies such as ADSL,
IDSL, MDSL, MSDSL.
4.1.7.1 G.shdsl, in brief
Standard
• ITU-T G.991.2
• compatibility with the equipment of other manufacturers
Transmission rate
• 192–2360 Kbit/s
Line code
• TC-PAM
Transmission medium
• one or two pairs
• possible installation of up to three regenerators
Usage
• PNOs, Internet service providers
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