When referring to xDSL, it doesn’t necessarily
point out to one single type of technology. Rather, xDSL is a line-up of
different types of DSL. The ‘x’ stands for the many variations of the DSL. Each
variation has its own capabilities. Also, they differ in their speeds, throughput,
and facilities used.
Asymmetrical Digital Subscriber
Line (ADSL)
ADSL is the most popular of these variations under today’s technology.
It is a new modem technology that converge the twisted pair telephone lines
with the high speed communication access capability for various services.
ISDN(like) Digital Subscriber
Line (IDSL)
The IDSL technique is all digital, operating at two channels of
64 Kbps for voice or nonvoice operation and a 16Kbps data channel for signaling,
control, and data packets. ISDN, was very slow to catch on, but the movement to
the internet created a whole new set of demands for the carriers to deal with.
High bit-rate
Digital Subscriber Line (HDSL)
HDSL was developed as a more efficient way of transmitting T1
and E1 over the existing copper wires. It does not require the repeaters on a
local loop of 12K. Also, its modulation rate is more advanced.
Consumer Digital Subscriber
Line (CDSL)
The Speeds of the ADSL are impractical for regular consumers. Thus,
a lower-speed communications capability was developed. This was done by using
the CDSL model. Unlike ADSL, CDSL does not use, nor need, a splitter on the
line. It also has a 1Mbps Download rate and a 160 Kbps Upload Rate.
Single High Speed Digital
Subscriber Line (SHDSL)
SHDSL has an increased reach of at least 30 percent greater than
any earlier symmetric DSL technology. It also supports repeaters which further
increase its reach capability. It also has an increase in symmetric bandwidth.
Rate-Adaptive Digital
Subscriber Line (RADSL)
RADSL was developed to achieve variations in the throughput and
be sensitive to the line conditions. This gives the flexibility to adapt to the
changing conditions and adjust the speeds in each direction to potentially
maximize the throughput on each line.
Very High-bit rate Digital
Subscriber Line (VDSL)
VDSL was developed to fulfill the demand of faster and more
reliable communications capabilities. It is develop to achieve higher speeds.
Single or Symmetric Digital
Subscriber Line (SDSL)
SDSL was developed to provide high-speed communications on a
single cable pair at distances of more than 10K. It was designed to deliver
1.544 Mbps on the single pair, however, the providers offer it at 768 Kbps.
thanks for the info jed... this subscriber line are to many but there characteristics and functionality are different, depending on where are they going to be used.
ReplyDeletekeep it up.
ADSL allows more data to be sent over existing copper telephone lines on plain old telephone services (POTS), when compared to traditional modem lines...thanks
ReplyDeletexDSL is a very versatile network with different variations with different designs and specification but with all the same goal, which is to improve the internet connection..
ReplyDeletetnx for the info.. keep it up
In terms of speed, DSL is faster than ISDN. DSL sends data packets with speeds ranging from 128Kbps – 1.5Mbps. On the other hand, ISDN comes in two different speeds i.e., 64Kbps and 128Kbps. that's why DSL has more advantage than ISDN but DSL is more expensive too. tnx for that blog keep it up.
ReplyDeleteFrom this blog that i have read, you have clearly differentiate the different kinds of xDSL which is very good and easy to understand..Thank you jed..
ReplyDeleteKUDOS!
I've learned a lot about DSL..
ReplyDeletenice post pal... keep it up ;)
nice post.. i learned a lot about DSL.
ReplyDeletekeep up the good work!
thx for the info i see that xdsl is not referring to one technology but it refers to deferent kind of dsl :)
ReplyDeleteNice blog, Jed. xDSL sure has a lot to offer. One of these is the ASDL which is a business-wise technology. Since it is asymmetric, as you stated here, it allows more bandwidth for downstream than upstream data flow. In addition, this technology combined with always-on access makes ASDL ideal for users who typically download much more data than they send ("Digital Subscriber Line," n.d.). This is good for business since users primarily download than upload data.
ReplyDeleteReference: Digital Subscriber Line (n.d.). Retrieved February 11, 2012, from http://docwiki.cisco.com/wiki/Digital_Subscriber_Line
Most Digital Subscriber Line service is sold as part of an Internet access package, so your Internet service provider will be your interface to getting a DSL connection to the Internet. To help decide which DSL service to buy, you want to consider what IP networking services are included in the agreement and for you to have a great connection... =)
ReplyDeleteThe Asynchronous Transfer Mode (ATM) composes a protocol suite which establishes a mechanism to carry all traffic on a stream of fixed 53-byte packets (cells). A fixed-size packet can ensure that the switching and multiplexing function could be carried out quickly and easily. ATM offers the economically sound “bandwidth on demand” features of packet-switching technology at the high speeds required for today’s LAN and WAN networks..nice work sir~! keep it up~!
ReplyDelete