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Internal
OBA001009 ADSL
Parameters In-depth
ISSUE 1.0
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Introduction
This course introduces various
parameters in the ADSL line profile
and guide the configuration of ADSL
services.
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Upon completion of this course, you will be
able to:
Master the meanings of all parameters
in the ADSL activation template
Master the method of selecting
parameters
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Chapter 1 ADSL Line profile
Chapter 2 ADSL Line Activation Parameters
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Adsl line-profile
Profi le index :1 Name: DEFVAL
ADSL transm issio n mode : All(G992.1~5,T1.413)
Trel l is mo de : Enable
Upstream channel bi t swap : Disable
Down stream channel bi t swap : Disable
Channel mode : Interleaved
Maximum dow nstream inter leaved delay(ms) : 6
Maximum upstream inter leaved delay(ms) : 6
Target dow nstream SNR margin(dB) : 6
Maximum acceptable dow nstream SNR margin(dB) : 31
Minimum acceptable downstream SNR margin(dB) : 0
Target ups tream SNR margin(dB ) : 6
Maximum acceptable ups tream SNR margin(dB) : 31
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Adsl line-profile
Minimum acceptable ups tream SNR margin(dB) : 0
Downs tream SNR margin for rate dow nsh i f t (dB ) : 0
Downs tream SNR margin for rate ups hi f t (dB) : 0
Upstream SNR margin for rate dow nsh i f t (dB) : 0
Upstream SNR margin for rate upsh i f t (dB ) : 0
Minimum upsh i f t t ime in dow nstream(secon ds) : 0
Min imum downs hi f t t ime in downst ream(seconds) : 0
Minimum upsh i f t t ime in ups tream(seconds ) : 0
Minimum downshi f t t ime in ups tream(seconds ) : 0
Downs tream Form of transm it rate adaptat ion : Adapt ing at star tup
Minimum transmit rate dow nstream(Kbps) : 32Maximum transmit rate dow nstream(Kbps) : 6144
Minimum transmit rate ups tream(Kbps ) : 32
Maximum transmit rate upstream(Kbps) : 640
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ADSL transmission mode
ADSL transmission mode:
> 0: All (G992.1, G992.2, T1.413)
> 1: Full rate (G992.1 or T1.413)
> 2: G992.2(g.l i te) (ADLI bo ard doesn 't supp ort g.l i te operating mode)
> 3: T1.413 (ADL I bo ard doesn 't supp ort T1.413 operating mode)
> 4: G992.1 (g.dm t)
> 5: g.hs (G992.1 and G992.2, G992.1 is pr io r to G992.2)
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ADSL standards
Standard type Standard name Description
First generation
ADSL
G992.1,T1.413Full-rate ADSL, with downstream rate of up to
8 Mbit/s.
G992.2 (G.Lite) Splitterless ADSL, with downstream rate of upto 1.5 Mbit/s.
Second generation
ADSL
G992.3 (G.dmt.bis)ADSL2 standard, with downstream rate of up to
12 Mbit/s.
G992.4 (G.lite.bis) ADSL2 G.lite
G992.5 (G.dmt.bisplus)ADSL2+ standard, with downstream rate of up
to 24 Mbit/s.
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Trellis Coding
Achieve the best coding effect by special coding algorithms so
as to improve the SNR gain of the line. Practice shows that the
use of Trellis coding can improve the line SNR gain by at least
3 dB to 6 dB.
The line SNR value can be improved by 3 dB to 6 dB after
Trellis coding is used while the redundancy code used for error
control occupies the same line bandwidth.
> Trell is mode 0-disable 1-enable (0~1) [1]:
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Uplink/Downlink Bit Swapping
Function is to adjust bit distribution or power between sub-channels without deactivating the line.
> Downs tream channel bit swap 0-dis able 1-enable (0~1) [0]:
> Upstream channel bit swap 0-disable1-enab le (0~1) [0]:
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Channel Mode
Fast: Fast mode. It has general error correction capability but has little delay.
It is suitable for delay-sensitive services.
Interleaved: Interleaved mode. It has strong error correction capability.
However, the delay will increase as the error correction capability becomes
stronger with the increase of the interleave depth. This mode is suitable for
the services that require high reliability but are delay insensitive.
Please select channel mode 0-interleaved 1-fast (0~1) [0]:
Wil l you set inter leaved d elay? (y/n)[n] :y
Maximum downstream in ter leaved delay(0~255 ms) [6] :
Maximum upstream inter leaved delay(0~255 ms) [6] :
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Channel Mode
Interleaved
send receive
transmitinput output
output input
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Interleaving Principle
1234567
891011121314
15161718192021
Bit sequence(withoutinterleaving)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Bit sequence(with interleaving)
1 8 15 2 9 16 3 10 17 4 11 18 5 12 19 6 13 20 7 14 21
Burst error
Receive bit(withoutinterleaving)
1 2 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Receive bit(with interleaving)
1 3 4 5 6 7 8 10 11 12 13 14 16 17 18 19 20 21
1234567
891011121314
15161718192021
Write into FEC
Read in channel
Interleaving Process
Deinterleaving Process:
Write into channel
Read in FEC
DepthD=3
Span N=7
21654321
16921581
21654321
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Form of transmit rate
Fixed
It indicates that an ADSL port is activated at a fixed downstream rate. This
downstream rate must be equal to the maximum/minimum downstream rate to beset.
adaptAtStartup
It indicates that an ADSL connection is set up between an ADSL port and the
Modem at an optimal rate according to the auto-training result between them. This
rate shall be within the range from the maximum to the minimum rate to be set.
adaptAtRuntime
It indicates that the line rates are adjusted according to line conditions. When line
conditions deteriorate, the line rate will be reduced to boost ADSL connection
stability. When line conditions are good, the line rate will be boosted.
> Please select form of transm it rate adaptation in dow nstream:> 0-f ixed 1-adaptA tStartup 2-adaptA tRun time (0~2) [1]:
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SNR margin
SNR (Signal to Noise Ratio) margin refers to the level of noise that is tolerable without
deteriorating the current line rates and Bit Error Rate (BER).
The SNR margin for a Modem is proportional to ADSL connection stability. The largerthe SNR margin is, the higher the stability will be.
> Wil l you set SNR margin for modem? (y/n) [n] :
> Target SNR margin in down stream (0~15 dB ) [6] :
> Minim um SNR margin in downstream (0~6 dB ) [0] :
> Maximum SNR margin in downstream (6~31 dB ) [31]:> Target SNR margin in ups tream (0~15 dB ) [6]:
> Minim um SNR margin in ups tream (0~6 dB ) [0] :
> Maximum SNR margin in upstream (6~31 dB ) [31]:
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Rate parameters
The rate is closely related to the ADSL line stability. A too high rate maycause poor stability in an ADSL connection.
> Wil l you set parameters for rate? (y/n) [n] :y
> Minim um transm it rate in dow nstream (32~32000 Kbps) [32]:
> Maximum transm it rate in down stream (32~32000 Kbps) [24544]:
> Minim um transm it rate in up stream (32~3000 Kbps ) [32]:
> Maximum transm it rate in up stream (32~3000 Kbps ) [1024]:
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Chapter 1 ADSL Line profile
Chapter 2 ADSL Line Activation Parameters
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Uplink/Downlink Noise Margin
The SNR
taken up for
bit allocation
Current
noise
margin
SNRduring
training
Used to
allocate
bits
Target
noisemargin
SNRatacertain
practicalmoment
The SNR
taken up for
bit
allocation
Current noisemargin
SNRatacertain
practicalmoment
The noise margin has
become a complex valueThe noise margin
can still be tolerated
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Uplink/Downlink Rate
The maximum rate that can be activated varies for the interleaved mode
and the fast mode due to the different overheads and algorithms they
adopt. The downlink rate can be up to 8128 kbps for the fast mode while
it can be only up to 7616 kbps for the interleaved mode.
The uplink rate can be up to 896 kbps for both the interleaved mode andthe fast mode. These values all refer to the values measure din the
G.dmt and T1.413 modes.
In the G.lite mode, the maximum uplink rate is 512 kbps and the
maximum downlink rate is 1536 kbps.
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Maximum Uplink/Downlink Rate
The maximum attainable rate is only a calculation result
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Uplink/Downlink Attenuation
The attenuation of a line is decided by the core diameter,
length, conductorand media material feature of the line.
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Transmit Power
The transmit power refers to the signal power sent by the Modem (CO,
CPE) to the line.
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Summary Upon completion we learned:
Various parameters in the ADSLactivation template
Guide the configuration of ADSL
services.
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