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Old 11-02-2007, 16:53   #12
Tezcatlipoca
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Location: Cambridge
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Re: Sky BB speed issues - improving a poor noise margin

Yeah, from looking around, seems it must still be the Sky LLU service, as the upstream is still a nice full 768kbps.


I disconnected the ring wire yesterday.... instant improvement. I now get the same stats as if it was connected to the test socket.

Quote:
Originally Posted by Netgear DG834GT
ADSL Link Downstream Upstream

Connection Speed 8096 kbps 768 kbps

Line Attenuation 41.0 db 27.5 db

Noise Margin 8.9 db 14.0 db

Did some speedtests at DSLZone...got a very nice 6meg, even with Alison downloading stuff at the same time.


From having a look around ThinkBroadband (formerly ADSLGuide) & Skyuser.co.uk, it seems like Sky have a policy of capping people's speeds dependant on line quality, with some people also being put on G.DMT (?) rather than ADSL2+.

It's apparently possible to get Sky to uncap your speed, & put you on ADSL2+, if you talk to "Tier3" tech support & they think your stats are good enough for it.


Quote:
Originally Posted by Netgear DG834GT ADSL info
/usr/sbin/adslctl: ADSL driver and PHY status

Status: Showtime Channel: INTR, Upstream rate = 768 Kbps, Downstream rate = 8096 Kbps

Link Power State: L0

Mode: G.DMT

Channel: Interleave

Trellis: ON

Line Status: No Defect

Training Status: Showtime

Down Up

SNR (dB): 8.4 14.0

Attn(dB): 41.0 27.5

Pwr(dBm): 19.8 11.5

Max(Kbps): 9120 1120

Rate (Kbps): 8096 768

G.dmt framing

K: 254(0) 25

R: 12 16

S: 1 8

D: 64 8

ADSL2 framing

MSGc: 1 1

B: 254 25

M: 1 8

T: 1 1

R: 12 16

S: 1.0470 8.6153

L: 2040 208

D: 64 8

Counters

SF: 711208 711206

SFErr: 88 0

RS: 96724306 6045251

RSCorr: 539088 4

RSUnCorr: 948 0



HEC: 56 0

OCD: 0 0

LCD: 0 0

Total Cells: 230858165 0

Data Cells: 12459284 0

Drop Cells: 0

Bit Errors: 0 0



ES: 73 0

SES: 3 0

UAS: 47 0

Total time = 3 hours 22 min 41 sec

SF = 711208

CRC = 88

LOS = 3

LOF = 0

ES = 73

Latest 1 day time = 3 hours 22 min 41 sec

SF = 711208

CRC = 88

LOS = 3

LOF = 0

ES = 73

Latest 15 minutes time = 7 min 41 sec

SF = 27171

CRC = 6

LOS = 1

LOF = 0

ES = 6

Previous 15 minutes time = 15 min 0 sec

SF = 52931

CRC = 6

LOS = 0

LOF = 0

ES = 4

Previous 1 day time = 0 sec

SF = 0

CRC = 0

LOS = 0

LOF = 0

ES = 0

15 minutes interval [-30 min to -15 min] time = 15 min 0 sec

SF = 52930

CRC = 5

LOS = 0

LOF = 0

ES = 5

15 minutes interval [-45 min to -30 min] time = 15 min 0 sec

SF = 52931

CRC = 6

LOS = 0

LOF = 0

ES = 4

15 minutes interval [-60 min to -45 min] time = 15 min 0 sec

SF = 52989

CRC = 4

LOS = 0

LOF = 0

ES = 4
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