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> SDSL and ADSL

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dy/dx
post Nov 6 2009, 09:44 AM
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What are these and what's the difference. Newbie to these kinda stuff.
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yap.ben
post Nov 6 2009, 09:53 AM
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SDSL = 1 mb up, 1mb down (up & down same speed)
ADSL = 512k up, 1mb down (best effort)
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fabianz03
post Nov 6 2009, 09:57 AM
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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
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ericong77
post Nov 6 2009, 10:35 AM
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Correction:

SDSL is 1.5M Up and Down.
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slimyboy
post Nov 6 2009, 04:06 PM
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QUOTE(ericong77 @ Nov 6 2009, 10:35 AM)
Correction:

SDSL is 1.5M Up and Down.
*



Nope, SDSL can go up to higher speeds.
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fabianz03
post Nov 6 2009, 04:42 PM
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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.
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pengiranijam
post Nov 6 2009, 09:02 PM
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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
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dy/dx
post Nov 7 2009, 12:05 PM
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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?
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aMer
post Nov 7 2009, 12:14 PM
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Do we have SDSL 4mbps?
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xts
post Nov 7 2009, 12:17 PM
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QUOTE(aMer @ Nov 7 2009, 12:14 PM)
Do we have SDSL 4mbps?
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SDSL max is 2.3mbps/2.3mbps for down & upstream
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fabianz03
post Nov 7 2009, 12:24 PM
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From: Sandakan
QUOTE(xts @ Nov 7 2009, 12:17 PM)
SDSL max is 2.3mbps/2.3mbps for down & upstream
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While ADSL2+ is 24Mbps down and 1Mbps up. icon_idea.gif
Correct me if I'm wrong.
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~Zhu~
post Nov 7 2009, 12:30 PM
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ADSL2+ with Annex M can have Downstream 24Mbps Upstream 3Mbps
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fabianz03
post Nov 7 2009, 12:31 PM
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Sorry tumpang thread. tongue.gif
Whats the difference between Annex M and no Annex M?
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lovelies
post Nov 7 2009, 12:34 PM
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while using SDSL, cannot use telephone...unlike, normal adsl streamyx, we can use internet while using telephone connected via a splitter.
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xts
post Nov 7 2009, 12:42 PM
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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
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fabianz03
post Nov 7 2009, 12:45 PM
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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
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