Could my speed be better?

[#1]

Test Outcome

	Pass
Test Outcome Code	GTC_FTTC_SERVICE_0001
Description	GEA service test completed and no fault found but unable to check for customer equipment connected to modem.
Main Fault Location	OK
Sync Status	In Sync
Downstream Speed	64.1 Mbps
Upstream Speed	20.0 Mbps
Appointment Required	N
Fault Report Advised	N
NTE Power Status	PowerOn
Voice Line Test Result	Pass
Bridge Tap	Not Detected
Radio Frequency Ingress	Not Detected
Repetitive Electrical Impulse Noise	Not Detected
Cross Talk	Not Detected
Estimated Line Length In Metres	501.4
Upstream Rate Assessment	Very Good
Downstream Rate Assessment	Good
Interference Pattern	Regular Interference Observed Daily
Service Impact	No Impact Observed
Interference Duration Longest Occurrence	; 00:00 to 23:45
Interference Location	Customer Premise
Interference Observed In Days	14
Home Wiring Problem	Not Detected
Downstream Policing Discard Rate	0.0
Customer Traffic Level	Upstream and Downstream Traffic Detected
Profile Name	0.128M-67M Downstream, Retransmission High - 0.128M-20M Upstream, Error Protection Off
Time Stamp	2016-11-17T17:30:00

Parameters	MIN	MAX	AVG
Down Stream Line Rate	66.9 Mbps	66.9 Mbps	66.9 Mbps
Up Stream Line Rate	19.9 Mbps	19.9 Mbps	19.9 Mbps

I've retested your service and from the stats above; the circuit is in sync at 64 Mbps, the banding is set at 67 Mbps.

If the banding was restricting the sync then we would arrange an engineer visit. As it's the other way round, we wouldn't I'm afraid. Rather, as the banding isn't restricting the sync speed we can't arrange the visit

[#2]

How is my sync on my router 66.997 Mbps when your test is showing 64.1? 😕 I mean, the linestats would support the line being banded, since it's literally generating no errors at all. 

As I asked before though, how come my line was reset before the work was completed, and not afterwards?

[#3]

From your router stats your router is showing a downstream line rate of 66.9 Mbps which is also what our stats are showing.

As the sync itself is within the estimated speed and not being restricted by the banding, it's something we can't arrange an engineer for

As for the line not appearing to be reset following the resolution of the fault, I can see that your fault was fixed remotely by our suppliers capacity management team as the issue was overutilisation across the VLANs. An engineer wasn't arranged.

[#4]

@Anoush  The OP's router is reporting a downstream line rate of 66.9 Mbps - surely that is the sync speed so it is being restricted by the banding. Can you explain what the 64.1 Mbps in your test is? How can the OP have a line rate higher than the sync speed? That doesn't make much sense. I think the speed could be better if the banding was removed.

[#5]

Yeah it seems a bit weird. My router is reporting the sync 66.9, GEA is saying the profile band is 67. My line never improved and the interleaving never backed off after the work was done. I'm really not seeing how this line isn't banded? 

[#6]

The line rate is 66.9, the sync is 64.1 Mbps. I'm not sure why DLM is not removing the banding of 67 to be honest but as the banding isn't restricting the speed we can't send out an engineer to reset the line because it's likely not to change anything.

Interleaving is also turned off. As for the discrepancy between the line rate and sync I'll look into it with my faults colleague tomorrow and will get back to you.

[#7]

On the ZyXEL VGM 8324, the actual line rate is the sync speed, so I'm still failing to see how the profile isn't banded. As I said before my line didn't improve at all after the problem was rectified on the 30th, the only improvement was that the mass CRC errors and error seconds cleared up.  

*Sorry didn't mean interleaving, I meant re-transmission. 

[#8]

---

@Anoush wrote:

The line rate is 66.9, the sync is 64.1 Mbps. I'm not sure why DLM is not removing the banding of 67 to be honest but as the banding isn't restricting the speed we can't send out an engineer to reset the line because it's likely not to change anything.

Interleaving is also turned off. As for the discrepancy between the line rate and sync I'll look into it with my faults colleague tomorrow and will get back to you.

---

This is the worst nonsense I've heard so far in this thread. "Line rate" and "sync speed" are usually used as different ways to refer to exactly the same value, the proper technical term for which is "Actual Net Data Rate". It can't be two different values at the same time.

[#9]

@ejs  I agree with you, so far Anoush has not explained what the 64.1Mbps value is but it certainly isn't the sync speed!

[#10]

Apologies for the lack of clarification.

I hadn't had a chance to look into it today and I'm on annual leave for the rest of the week.

I'll pick this back up on Monday.

Sorry for any inconvenience caused.

[#11]

No worries, enjoy the downtime!

[#12]

Thanks @aj007 and many apologies for not picking this back up yesterday.

I seemed to have missed it off my To Do list  I'll definitely get back to you tomorrow with clarification.

[#13]

Thanks for your patience.

Regarding the GEA service test detail, the line rate is the sync over time, and sync shows this rounded up. If the banding was restricting the speed then the circuit would sync at the top end of the banding i.e. 67 Mbps.

I hope this helps clarify things

[#14]

@Anoush

That does not help "clarify" things at all.

Have you considered the possibility that the GEA Test Result is showing an incorrect value for some unknown reason?

How do you explain that the minimum, average and maximum downstream line rate values from the test results are all 66.9? Clearly the line rate / sync speed being anything other than 66.9 would be inconsistent with those figures.

How do you explain the 66,997k sync speed / line rate reported by the modem?

The circuit is in sync at the top end of the banding, and the GEA Test Result is displaying an incorrect speed of 64.1.

[#15]

Sorry @Anoush but your clarification bears no relation to the facts and is as clear as mud, as pointed out by @ejs. The modem is syncing at the banded speed, what the 64.1 Mbps figure is you have still failed to explain.