ADSL2 , ADSL2+ et compatibilité entre MODEM et DSLAM
Contexte:
Ligne ADSL2+ degroupe par CLub Internet ( Yvelines / infrastructure de degroupage fourni par LDCOM )
Speed TOUCH Home ethernet ( ADSL 1 )
Modem LinkSys ADSL2MUE ( ADSL2/ADSL2+ )
SpeedTouch 516 ( ADSL2/ADSL2+)
Avec L'ancetre
>golden operational_data
Operational data report : near end (Downstream)
-----------------------------------------------
Attainable line rate : 8076 kbit/sec
Attainable Atm rate : 7072 kbit/sec
Used line rate : 7916 kbit/sec
Fast used Atm rate : 0 kbit/sec
Interleaved used Atm rate : 6944 kbits/sec
Rel. capacity occupation : 98
Noise Margin : 10 dB
Line attenuation : 16 dB
Output Power : 17 dBm
Operational data report : far end (Upstream)
--------------------------------------------
No data available.
Type 'help golden' for more information.
Avec la nouvelle generation par LinkSys
#cat /proc/avalanche/avsar_modem_stats
AR7 DSL Modem Statistics:
--------------------------------
[DSL Modem Stats]
US Connection Rate: 768 DS Connection Rate: 8352
DS Line Attenuation: 19 DS Margin: 10
US Line Attenuation: 4 US Margin: 10
US Payload : 36768 DS Payload: 40416
US Superframe Cnt : 7882 DS Superframe Cnt: 7883
US Transmit Power : 0 DS Transmit Power: 0
LOS errors: 0 SEF errors: 0
Frame mode: 3 Max Frame mode: 0
Trained Path: 1 US Peak Cell Rate: 1811
Trained Mode: 3 Selected Mode: 1
ATUC Vendor Code: 4753504E ATUC Revision: 1
Hybrid Selected: 1 Trellis: 1
Showtime Count: 1 DS Max Attainable Bit Rate: 8576
BitSwap: 1 US Max Attainable Bit Rate: n/a
[Upstream (TX) Interleave path]
CRC: 1 FEC: 0 NCD: 0
LCD: 0 HEC: 68
[Downstream (RX) Interleave path]
CRC: 0 FEC: 0 NCD: 0
LCD: 0 HEC: 0
[Upstream (TX) Fast path]
CRC: 0 FEC: 0 NCD: 1
LCD: 0 HEC: 0
[Downstream (RX) Fast path]
CRC: 0 FEC: 0 NCD: 0
LCD: 0 HEC: 0
[ATM Stats]
[Upstream/TX]
Good Cell Cnt: 766
Idle Cell Cnt: 241940
[Downstream/RX)]
Good Cell Cnt: 842
Idle Cell Cnt: 2638746
Bad Hec Cell Cnt: 0
Overflow Dropped Cell Cnt: 0
[SAR AAL5 Stats]
Tx PDU's: 278
Rx PDU's: 237
Tx Total Bytes: 29319
Rx Total Bytes: 33905
Tx Total Error Counts: 0
Rx Total Error Counts: 0
[OAM Stats]
Near End F5 Loop Back Count: 0
Near End F4 Loop Back Count: 0
Far End F5 Loop Back Count: 0
Far End F4 Loop Back Count: 0
Avec la nouvelle generation par Thomson
{Administrator}=>adsl info
Modemstate : up
Operation Mode : G.992.5 Annex A
Channel Mode : interleaved
Number of resets : 1
Vendor Local Remote
Country : 0f ff
Vendor : TMMB GSPN
VendorSpecific : 0000 000d
StandardRevisionNr : 00 02
Downstream Upstream
Margin [dB] : 10.5 10.5
Attenuation [dB] : 20.0 6.0
OutputPower [dBm] : 32.5 8.0
Intrinsic/Actual Bandwidth %
Upstream : 2
Downstream : 84
Available Bandwidth Cells/s Kbit/s
Downstream : 35863 15206
Upstream : 1500 636
Transfer statistics
Errors
Received FEC : 861
Received CRC : 18
Received HEC : 1
Transmitted FEC : 4
Transmitted CRC : 1
Transmitted HEC : 0
Near end failures since reset
Loss of frame: 0 failures
Loss of signal: 0 failures
Loss of power: 0 failures
Errored seconds: 2 seconds
Near end failures last 15 minutes
Loss of frame: 0 seconds
Loss of signal: 0 seconds
Loss of power: 0 seconds
Errored seconds: 0 seconds
Near end failures current day
Errored seconds: 2 seconds
Near end failures previous day
Errored seconds: 0 seconds
Analyse des resultats
Les trois equipements detectent un affaiblissement quasi identique ( 16db , 19db et 20db ) .
Les deux equipements ADSL2/2+ se connectent a des vitesses differentes ( facteur 2 ) .
8352 kbit/s pour le linksys ADSL2MUE
15206 kbit/s pour le SpeedTouch 516
Conclusion
Linksys vend un modem ADSL2+ incompatible avec certains DSLAM .
Plusieurs produit du meme constructeur , ainsi que d'autres constructeurs , sont impactes car construit autour de la meme plateforme .
Dans le tableau suivant ( http://wiki.openwrt.org/TableOfHardware
) , il faut regarder les produits bases sur la plateforme Texas Instruments AR7 .
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