Lowyat.NET Forums

Welcome Guest ( Log In | Register )

LYN wins Intel-Lenovo-Tangs Blogathon challenge. Thank you everybody!
 
 RSS feedBump TopicReply to this topicStart new topicStart Poll

Outline · [ Standard ] · Linear+

> SDSL and ADSL

Share on | Track this topic | Email this topic | Print this topic
dy/dx
post Nov 6 2009, 09:44 AM
Show posts by this member only |This post's rating (0+, 0-) | Post #1


♥ Tiffany ♥
****

Group: Senior Member
Posts: 540
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: May 2009
What are these and what's the difference. Newbie to these kinda stuff.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
yap.ben
post Nov 6 2009, 09:53 AM
Show posts by this member only |This post's rating (0+, 0-) | Post #2


Newbie
*

Group: Junior Member
Posts: 20
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Jul 2008
SDSL = 1 mb up, 1mb down (up & down same speed)
ADSL = 512k up, 1mb down (best effort)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fabianz03
post Nov 6 2009, 09:57 AM
Show posts by this member only |This post's rating (0+, 0-) | Post #3


Junior Pilot
*******

Group: Senior Member
Posts: 2,171
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2008
From: Sandakan
QUOTE
SDSL is a rate-adaptive Digital Subscriber Line (DSL) variant with T1/E1-like data rates (T1: 1.544 Mbit/s, E1: 2.048 Mbit/s). It runs over one pair of copper wires, with a maximum range of 10,000 feet (3,000 m). It cannot co-exist with a conventional voice service on the same pair as it takes over the entire bandwidth.[1]

SDSL is a proprietary technology that was never standardized. As such it usually only interoperates with devices from the same vendor. It is the predecessor of G.SHDSL which was standardized in February 2001 by ITU-T with recommendation G.991.2.[2] SDSL is often confused with G.SHDSL and HDSL[3]; in Europe, G.SHDSL was standardized by ETSI using the name 'SDSL'. This ETSI variant is compatible with the ITU-T G.SHDSL standardized regional variant for Europe.

As there is a standardised successor available, SDSL installations today are considered legacy. Most new installations use G.SHDSL equipment instead of SDSL.[citation needed]

SDSL typically falls between ADSL and T1/E1 in price and was mainly targeted at small and medium businesses who don't need the service guarantees of Frame Relay or the higher performance of a leased line.[4].


http://en.wikipedia.org/wiki/Symmetric_dig...subscriber_line
SDSL = Symmetric Digital Subscriber Line

ADSL have many modes.
http://en.wikipedia.org/wiki/Asymmetric_di...subscriber_line

ADSL = Asymmetric Digital Subscriber Line


As the post above says, it's basically just like that.
But for more info, I recommend you to read through wikipedia. smile.gif
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ericong77
post Nov 6 2009, 10:35 AM
Show posts by this member only |This post's rating (0+, 0-) | Post #4


Newbie
*

Group: Junior Member
Posts: 43
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Jan 2007
From: KK & KL
Correction:

SDSL is 1.5M Up and Down.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
slimyboy
post Nov 6 2009, 04:06 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #5


Newbie
*

Group: Junior Member
Posts: 7
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: May 2008
QUOTE(ericong77 @ Nov 6 2009, 10:35 AM)
Correction:

SDSL is 1.5M Up and Down.
*



Nope, SDSL can go up to higher speeds.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fabianz03
post Nov 6 2009, 04:42 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #6


Junior Pilot
*******

Group: Senior Member
Posts: 2,171
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2008
From: Sandakan
QUOTE(slimyboy @ Nov 6 2009, 04:06 PM)
Nope, SDSL can go up to higher speeds.
*


But still not as high as fiber.
SDSL still uses copper technology.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
pengiranijam
post Nov 6 2009, 09:02 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #7


Absolute Infinity
******

Group: Senior Member
Posts: 1,014
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Dec 2004
From: Malaysia Truly Asia
SDSL is a rate-adaptive Digital Subscriber Line (DSL) variant with T1/E1-like data rates (T1: 1.544 Mbit/s, E1: 2.048 Mbit/s). It runs over one pair of copper wires, with a maximum range of 10,000 feet (3,000 m). - Refer @ http://en.wikipedia.org/wiki/Symmetric_dig...subscriber_line

and

ADSL2 can reach download rate at 24 Mbit/s and upload at 3.5 Mbit/s Refer @ http://en.wikipedia.org/wiki/Asymmetric_di...subscriber_line
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
dy/dx
post Nov 7 2009, 12:05 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #8


♥ Tiffany ♥
****

Group: Senior Member
Posts: 540
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: May 2009
QUOTE(yap.ben @ Nov 6 2009, 09:53 AM)
SDSL = 1 mb up, 1mb down (up & down same speed)
ADSL = 512k up, 1mb down (best effort)
*


So basically, SDSL is better?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aMer
post Nov 7 2009, 12:14 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #9


Getting Started
**

Group: Junior Member
Posts: 241
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Jan 2006
Do we have SDSL 4mbps?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
xts
post Nov 7 2009, 12:17 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #10


Getting Started
**

Group: Junior Member
Posts: 136
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2009
From: Johore
QUOTE(aMer @ Nov 7 2009, 12:14 PM)
Do we have SDSL 4mbps?
*



SDSL max is 2.3mbps/2.3mbps for down & upstream
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fabianz03
post Nov 7 2009, 12:24 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #11


Junior Pilot
*******

Group: Senior Member
Posts: 2,171
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2008
From: Sandakan
QUOTE(xts @ Nov 7 2009, 12:17 PM)
SDSL max is 2.3mbps/2.3mbps for down & upstream
*


While ADSL2+ is 24Mbps down and 1Mbps up. icon_idea.gif
Correct me if I'm wrong.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
~Zhu~
post Nov 7 2009, 12:30 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #12


Getting Started
**

Group: Junior Member
Posts: 92
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Jan 2003
ADSL2+ with Annex M can have Downstream 24Mbps Upstream 3Mbps
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fabianz03
post Nov 7 2009, 12:31 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #13


Junior Pilot
*******

Group: Senior Member
Posts: 2,171
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2008
From: Sandakan
Sorry tumpang thread. tongue.gif
Whats the difference between Annex M and no Annex M?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
lovelies
post Nov 7 2009, 12:34 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #14


Newbie
*

Group: Junior Member
Posts: 40
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2008
while using SDSL, cannot use telephone...unlike, normal adsl streamyx, we can use internet while using telephone connected via a splitter.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
xts
post Nov 7 2009, 12:42 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #15


Getting Started
**

Group: Junior Member
Posts: 136
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2009
From: Johore
if i'm not mistaken

G.992.3 Annex L
- Reach Extended ADSL2
- Targets 192 kbit/s DownStream - 96 kbit/s Upstream on 6km (0.4mm cable)

G.992.3/5 Annex M
- Increases Upstream speeds

This post has been edited by xts: Nov 7 2009, 12:45 PM
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fabianz03
post Nov 7 2009, 12:45 PM
Show posts by this member only |This post's rating (0+, 0-) | Post #16


Junior Pilot
*******

Group: Senior Member
Posts: 2,171
Ratings earned: 0+, 0-
Ratings given: 0+, 0-

Joined: Aug 2008
From: Sandakan
QUOTE(xts @ Nov 7 2009, 12:42 PM)
if i'm not mistaken

Annex L
- Reach Extended ADSL2
- Targets 192 kbit/s DownStream - 96 kbit/s Upstream on 6km (0.4mm cable)

Annex M
- Increases Upstream speeds
*


I see... hmm.gif
Annex M is also known as ITU G.992.5/G.992.3
QUOTE
Annex M is an optional specification in ITU-T recommendations G.992.3 (ADSL2) and G.992.5 (ADSL2+), also referred to as ADSL2 M and ADSL2+ M. This specification extends the capability of commonly deployed Annex A by more than doubling the number of upstream bits. The data rates can be as high as 12 or 24 Mbit/s downstream and 3 Mbit/s upstream depending on the distance from the DSLAM to the customer's home.

The main difference between this specification and Annex A is that the upstream/downstream frequency split has been shifted from 138 kHz up to 276 kHz (as in Annex J), allowing upstream bandwidth to be increased from 1.4 Mbit/s to 3.3 Mbit/s, with a corresponding decrease in download bandwidth.


Got this from wikipedia...

This post has been edited by fabianz03: Nov 7 2009, 12:46 PM
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · Broadband User-2-User · Next Newest »
 

Bump TopicReply to this topicTopic OptionsStart new topic
 



----debug section please ignore----
Lo-Fi Version Time is now: 24th November 2009 - 06:49 AM
All Rights Reserved 2003-2009 Vijandren Ramadass (~living on a prayer~)
Powered by Invision Power Board(Trial) © 2009  IPS, Inc.