SHDSL modem and multiplexer transmits
SHDSL modem and multiplexer transmits two combined data streams –
E1, Ethernet or serial –on an SHDSL link at various data rates over a range up to 10 km (6.2 miles). The modem also supports T1 applications. Incorporating TC-PAM technology for extending the transmission range, the ASMi-52 SHDSL modem enables carriers to cost-effectively reach more users with copper lines at higher data rates over larger distances in the Last Mile. The ASMi-52 SHDSL modem and mux answers the data transmission and Ethernet extension needs of enterprise users. Typical users include municipalities, utilities, corporate connectivity, and cellular backhaul.
SHDSL was supposed to supplant SDSL as of 2003 (or so) I thought, but I never see advertised speeds go beyond a 1.5 Mbps SDSL line… SHDSL goes to 2.3 Mbps and has other advantages over SDSL (longer loop lengths for given speeds, less interference with other data lines, 4-wire mode). I’m not that well educated on the topic, but I also had the impression there could be some cost savings.
Today T1’s are often delivered using this technology, but why not offer SHDSL from the customer to DSLAM like a normal dedicated DSL line…. and give customers the speed they want, distance depending???
Are ISPs just not ready to upgrade their DSLAM equipment, or don’t want to cannibalize their higher priced bonded T1 services?
You may not need the SLA of a real T1, but you’d sure love 2.3 Mbps up and down for let’s say $150/mo or so.
First…. you have to look at who is selling SDSL. Basically Covad and a few small CLECs. They bought non-standards-based SDSL long ago and they are still using the equipment.
Given the financial state of Covad I can see why they aren’t going around ripping out all their DSLAMs.
Use a copper cable that runs from the telephone company to provide dedicated modem Internet bandwidth at a lower price for T1 service. shdsl broadband used to provide Internet access, but this is not a substitute for communication based on protocols other than TCP / IP. It allows the transfer speed of data even in both directions, it is “symmetrical”. Sometimes a few lines have impairments that prevent non-arm’s total copper suitable and prevent some benefit from a SHDSL connection.
SHDSL was supposed to replace in 2003 (almost) I thought, but I’ve never seen advertised speeds beyond a line SHDSL 1.5 Mb / s … SHDSL to 2.3 Mbps and has other advantages over SHDSL (loop lengths shown in speed, less interference with other lines of data, so the son of 4). I am not knowledgeable on the subject, but I also felt that there could be savings.
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