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[Pfrog]

Hi

After a long period of contented Plusnet fibre using an unlocked HG612 I note that this morning my max attainable rate is still approx 97mbit/s and the line rate is 76/20 (used to be 80/20), however the actual max download is 52 - and this is confirmed by a BT Speedtest and numerous thinkbroadband tests at various servers.  I am about 400m from the cabinet.

HG612

Attainable rate (kbit/s)   96580   24985
SNR margin (dB)   7   6.7
Line attenuation (dB)   13.9   0
Output power (dBmV)   14.3   1.9


BT Test

 Download speedachieved during the test was - 50.42 Mbps
 For your connection, the acceptable range of speedsis 40 Mbps-73.93 Mbps .
 Additional Information:
 IP Profile for your line is - 73.93 Mbps

The change happened at about 06.00 with a jump in ping from 15 to about 25ms.  Both snrs are about 7db and the DS attenuation is 13.9db.

DSLStats shows:

Stats recorded 26 Jun 2015 10:40:25

DSLAM/MSAN type:           IFTN:0xb204 / v0xb204
Modem/router firmware:     AnnexA version - A2pv6C038m.d24j
DSL mode:                  VDSL2 Profile 17a
Status:                    Showtime
Uptime:                    36 min 5 sec
Resyncs:                   0 (since 26 Jun 2015 08:58:21)
         
            Downstream   Upstream
Line attenuation (dB):     13.9      0.0
Signal attenuation (dB):   Not monitored      
Connection speed (kbps):   76382        20000
SNR margin (dB):           6.9      6. 7
Power (dBm):               14.3         1.9
Interleave depth:          1195       298
INP:                       3.00      2.50
G.INP:                     Not enabled      

RSCorr/RS (%):             0.0004      0.0224
RSUnCorr/RS (%):           0.0000      0.0000
ES/hour:                   0      0


         Bearer 0
INP:      3.00      2.50
INPRein:   0.00      0.00
delay:      6      6
PER:      1.33      5.12
OR:      119.53      190.47
AgR:      76501.16   20190.17

Should I expect a drop of actual achievable download from about 74 down to 52?

G-INP is shown as not enabled so I appear not to be a victim of the G-INP rollout issues?

Any thoughts would be greatly appreciated as I am a bit baffled!

[roseway]

Your IP profile is 73.93 Mbps, and this is in line with your connection speed, so your reduced download speed is caused by something other than the state of your DSL connection. This could be congestion in the exchange or in your ISP's network, or some temporary networking/routing issue.

[kitz]

my max attainable rate is still approx 97mbit/s and the line rate is 76/20

You have had INP applied to your line which means Interleaving and Error Correction has been applied.  The redundancy required to carry RS overheads means that the line has to carry a level of redundant data above the sync throughput speed.   These overheads are what appear to cause the max attainable to be higher than the actual sync speed.

That doesnt account for the difference between sync and throughput speed though.   The Error rate % seems low, so its not I assume that you wont be getting lots of CRCs which is something that could slow throughput so as Eric says its looking like something else.

One other thing to try is the http x6 v hhtpx1 test on Thinkbroadband which will produce a graph comparing the two,  depending on how straight that line is, it can sometimes give an indication of where the issue may be. 

[Pfrog]

Hi

And thanks for the replies......  The test as Kitz has suggested is below but fails to enlighten me particularly as to the underlying cause of the low download spped compared to the Sync speed...... any thoughts please?  CRC errors appear to be very low according to the HG612 stats.

http://www.thinkbroadband.com/speedtest/results.html?id=143532486620588723088

Thanks again!

[Chrysalis]

find out what your plusnet speed profile is.

either by asking them or checking the broadband tools section in the member area.

[Pfrog]

All it has is:

Estimated line speed:
    There's no speed estimate currently held on your account.
Current line speed:
    52.4 Mb

[Chrysalis]

yep there you have it, they set the profile to 52.4mbit, thats the problem.

Ask them to bump it up to 74mbit.

Code: [Select]

Current line speed:
    52.4 Mb
is the plusnet profile.