SHDSL, known as Single-pair High-speed Digital Subscriber Line (ITU) or Symmetric High-Bitrate Digital Subscriber Loop (DSL Forum), is one of the most cost-effective means of extending the range of copper loop for broadband services such as Ethernet extension, Internet access, PBX connectivity, and SCADA communications.
SHDSL offers full-duplex transport of more than 2 Mbps data rates on a single pair of copper wires to a distance of 4 kilometers (2.5 miles).
The latest SHDSL standard is the SHDSL.bis, a high-bandwidth technology that enables service providers to use existing copper wires to close the gap between low-speed SHDSL and fiber.
Based on the ITU-T G.991 and ETSI TS 101524 standards, SHDSL.bis uses TC-PM 16 or TC-PAM 32 line coding and multi-pair bonding technology to reach transmission rates up to 5.69 Mbps on 1 pair (2-wire), 11.4 Mbps over 4-wire, for a rate up to 22.8 Mbps over 8-wire. SHDSL.bis provides high-bandwidth transmission at a distance of up to 2.9 km (1.825 miles).
Given the large installed base of DSLAM networks for residential customers, SHDSL provides service providers and alternative carriers with a unique opportunity to leverage existing infrastructure to supply new business-class services.
RAD incorporates SHDSL functionality in many of its SHDSL product lines, providing solutions to a large variety of SHDSL applications. RAD’s integrated access devices offer SHDSL access over both IP DSLAM and ATM DSLAM networks. Carriers with an ATM backbone can employ RAD’s ATM access units to concentrate multiple services over an SHDSL link. RAD’s SHDSL modems extend operating ranges, while SHDSL repeaters double transmission distances. RAD’s digital cross connect provides aggregation and grooming of SHDSL timeslots. In addition to standalone SHDSL modems, RAD offers an SHDSL modem rack as central site solution.