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~ DLM Profiles - ADSL
The line will progress through various profiles depending if the line is deemed stable or unstable.
Stable:
If the line is deemed stable then it will be moved down the scale in the same mode (ie interleaved or fast) to the next lowest Target SNRM profile.
Interleaving will be removed after a period of stability at the 6dB Target SNRM profile.
ADSL 2+ lines if very stable may be moved down to 3dB Target SNRM profile.
Unstable:
If the line is unstable, the first change would be to retain the same Target SNR Margin, but apply interleaving.
If the line is already interleaved then it is moved to the next highest Target SNR Margin profile.
If the line has been opted out of interleaving then the next Target SNR Margin step will be applied. |
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In extreme cases of instability, adsl lines may be given a capped or fixed rate profile. |
20CN Fixed Rate Profiles
| 20CN Fixed Rate Profiles |
| Rate Range |
Interleave
|
Target SNRM
|
| From |
To |
Index
|
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1152
|
2272
|
0 or 1
|
6 dB
|
|
576
|
1152
|
0 or 1
|
6 dB
|
|
288
|
576
|
0 or 1
|
6 dB
|
|
160
|
288
|
0 or 1
|
6 dB
|
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| Upstream 288 kbps on all. |
ADSL2+ Capped Profiles
| ADSL2+ Capped Profiles |
| Rate Range |
Interleave
|
Target SNRM
|
| From |
To |
Index
|
|
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|
|
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7168
|
14336
|
0,1 or 2
|
6 dB
|
|
4864
|
9728
|
0,1 or 2
|
6 dB
|
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3328
|
6656
|
0,1 or 2
|
6 dB
|
|
2272
|
4544
|
0,1 or 2
|
6 dB
|
|
1472
|
3072
|
0,1 or 2
|
6 dB
|
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~ DLM Profiles - FTTC
Works slightly different to the adsl algorithm,
Target SNR Margin is fixed at 6dB for all profiles
No option to remove interleaving
Variables: Interleaving, Impulse Noise Protection (INP) & Capping (or Banding)
Capped profiles have a maximum sync rate applied
Interleaving, off or one of two different profiles
INP
Indicative Line Quality: A Mean Time Between Errors
ORC2M-20311 |
GEA-FTTC: DLM policy threshold changes for mean time between errors (MTBE). |
~ FTTC Banding Profiles.
| |
|
| Downstream Bands (Mbps) |
| From |
To |
| 0.128 |
2 |
| 1.2 |
2.5 |
| 1.5 |
3.1 |
| 7.5 |
15 |
| 8.2 |
16.5 |
| 9 |
18 |
| 10 |
20 |
| 13.7 |
27.4 |
| 15 |
30 |
| 16.2 |
32.4 |
| 17.5 |
35 |
| 20 |
40 |
| 0.128 |
40 |
| 22 |
44 |
| 25 |
49 |
| 27 |
54 |
| 37 |
74 |
| 40 |
80 |
| |
|
|
| Upstream Bands (Mbps) |
| From |
To |
| 0.128 |
0.8 |
| 0.5 |
2 |
| 3.6 |
7.2 |
| 4.2 |
8.5 |
| .0128 |
10 |
| 6 |
12 |
| 7.5 |
15 |
| 8 |
17 |
| 10 |
20 |
| |
|
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| |
SNR Margin |
Interleaving |
INP / RETX |
Capping/Banding |
| |
|
|
|
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| ADSL1 |
6-15 dB |
ON/OFF |
NO |
In extreme circumstances |
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| ADSL 2 |
3-15dB |
ON/OFF |
INP0 (off/low)
INP1, INP2 |
Yes |
| |
|
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|
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| FTTC |
Fixed 6dB |
ON. depth 1= off |
RETX0, RETX1, RETX2 |
Yes |
| |
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ADSL1
SNR Margin 6-15dB in 3 dB steps.
Interleaving.
ADSL2+
SNR Margin 3-15dB in 3 dB steps.
Interleaving.
INP
Independent upstream monitoring
On the downstream, interleaving will be set to either off/low/high. On the upstream, interleaving will be set to either off/on. (This is the same as before).
With retransmission, you can have it set to off/low/high on both the downstream and upstream.
In total there are 14 profiles available to DLM for each sync band (e.g. a 0.128M-60M downstream profile). You will also notice the lower cap for each profile has been removed (you can compare this to the ones here - http://community.plus.net...-what-it-is-how-it-works/)
If you're on an older profile, DLM will not move you to one of the new profiles above unless it sees an improvement/deterioration in your line
‘open profile’ which is likely to be either; 0.128M-40M or 0.128M-80M on the downstream and either 0.128M-20M or 0.128M-10M (depending on whether you’re on an up to 38Mbps or 76Mbps product). your line will be left on an open profile for 2 days initially to allow the line to adjust following the installation.
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