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WildBill
Aspiring Contributor
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Message 1 of 3

BT Infinity 2 HomeHub 5 DSL Re-sync issues?

Hi All,

 

I wonder if someone is able to assist. I recently migrated back to BT Infinity 2 Unlimited (FTTC) from Sky Fiber Unlimited (FTTC). (BT had a better package deal etc.) I had been with BT for several years prior to Sky without issues.

This unfortunately is where my connection issues started.

 

The setup with Sky Fiber was as follows:-

Sky Hub connected to a BT OpenReach Modem (ECI type) connected to an ECI cabinet.

Data rates were 40,000 Down - 8000 Up (Interleaved).

This connection was very stable. It would stay connected for months at a time.

 

The setup with BT is as follows:-

BT HomeHub 5. (Yes, I know you just smiled!) 🙂

After the 10 day period it settled at a data rate around 50,000 Down - 7000 Up (Interleaved).

However, this modem re-syncs (not reboots) the DLS connection several times a day.

The worst time of day is between 18.00 - 02.00hrs. If you want to game, stream or watch a movie on the YouView box you can forget about it. Last night between 18.00 - 01.00hrs it re-synced 14 times.

The DLM has kicked in hard and the line stats at the moment are:-

 

1. Product name:BT Home Hub
2. Serial number:+068343+NQ41575995
3. Firmware version:Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated Unknown
4. Board version:BT Hub 5A
5. VDSL uptime:0 days, 01:10:07
6. Data rate:6210 / 29998
7. Maximum data rate:6277 / 57941
8. Noise margin:6.2 / 11.8
9. Line attenuation:0.0 / 22.2
10. Signal attenuation:0.0 / 20.6

 

The last log entry before it re-syncs is PPP LCP Send Termination Request [User request].

I have read the long thread about this and I am not saying that this is the cause, just reporting what the log says before the re-sync.

 

I have also read alot of other threads that suggest the HomeHub 5 does like to re-sync alot for whatever reasons.

 

As the data you collect from the HomeHub 5 is limited I decided to use an Asus DSL-AC68U to capture line data over a 24hr period to try and spot why the routers (Yes the Asus re-syncs on the line aswell) indicating its a line issue rather than a router issue.

 

The results tend to show an high amount of CRC error / Error seconds just before the re-sync occurs.

Below are some examples:-

 

Yesterday, uptime before 18.00hrs

 

Tx_CRC[0] = 0
Tx_FEC[0] = 15
Tx_ERR_SEC = 0
Tx_FEC_SEC = 11
Rx_CRC[0] = 684
Rx_FEC[0] = 58554235
Rx_ERR_SEC = 276
Rx_FEC_SEC = 29064
Near-end total: los=0, sef=0, lpr=0
Far-end total: los=2, sef=2, lpr=0
VDSL2 Sync-Up Time: 0 Day(s) 8:37:41
[Vcxo]=10622342
##TASK:Vdsl2LogShowTimeErrPwr done [4 symbols]

Pilot info:[174] SNRM=45.75,SNR=48.05,Bit= 0,ErrPwr=35,FFTout(52/890)
SNRM[min=1577]=-2.49, (SNR=19.30, Bit= 7, ErrPwr=1068140)
SNRM:Ave= 8.29-> 8.4, Max[1573]=12.44, Min[1577]=-2.49
SNRM_Band[0]= 8.8-> 9.0
SNRM_Band[1]= 7.8-> 8.0
SNRM_Band[2]= 8.1-> 8.3
US SNRM = 7.4
##TASK:Vdsl2TaskPMDSNRSNRMCalc done [13 symbols]
[ST_TASK] OLR_EXEC (1)
CG=7, NM=-2, CG-NM=9
[OVHD_DBG] ACT_INP in Bearer[1]=0
##TASK:Vdsl2FarACTINP done [0 symbols]
[END] SSCN/STSSC (DS SSC) = 1024/1023 (0)
Link State: DSL link down.

 

Below are examples where the connection re-syncs constantly one after the other:-

 

Tx_CRC[0] = 0
Tx_FEC[0] = 0
Tx_ERR_SEC = 0
Tx_FEC_SEC = 0
Rx_CRC[0] = 508
Rx_FEC[0] = 2368159
Rx_ERR_SEC = 137
Rx_FEC_SEC = 1181
Near-end total: los=0, sef=0, lpr=0
Far-end total: los=1, sef=1, lpr=0
VDSL2 Sync-Up Time: 0 Day(s) 0:19:41

 

Tx_CRC[0] = 0
Tx_FEC[0] = 0
Tx_ERR_SEC = 0
Tx_FEC_SEC = 0
Rx_CRC[0] = 529
Rx_FEC[0] = 1907420
Rx_ERR_SEC = 180
Rx_FEC_SEC = 901
Near-end total: los=0, sef=0, lpr=0
Far-end total: los=1, sef=2, lpr=0
VDSL2 Sync-Up Time: 0 Day(s) 0:15: 1
[Vcxo]=10620162
##TASK:Vdsl2LogShowTimeErrPwr done [5 symbols]

 

Tx_CRC[0] = 0
Tx_FEC[0] = 0
Tx_ERR_SEC = 0
Tx_FEC_SEC = 0
Rx_CRC[0] = 529
Rx_FEC[0] = 1907420
Rx_ERR_SEC = 180
Rx_FEC_SEC = 901
Near-end total: los=0, sef=0, lpr=0
Far-end total: los=1, sef=2, lpr=0
VDSL2 Sync-Up Time: 0 Day(s) 0:15: 1
[Vcxo]=10620162
##TASK:Vdsl2LogShowTimeErrPwr done [5 symbols]

 

Tx_CRC[0] = 0
Tx_FEC[0] = 0
Tx_ERR_SEC = 0
Tx_FEC_SEC = 0
Rx_CRC[0] = 2916
Rx_FEC[0] = 1154722
Rx_ERR_SEC = 57
Rx_FEC_SEC = 561
Near-end total: los=0, sef=0, lpr=0
Far-end total: los=4, sef=3, lpr=0
VDSL2 Sync-Up Time: 0 Day(s) 0: 9:21

 

As you can see, the CRC and error seconds are alot higher than during the day.

 

Here are the things I have tried to eliminate any electrical interference within the home that would be causing this:-

 

1. Router directly into test socket with no internal wiring connected.

2. Bought a new BT Mk2 vDSL/ADSL Faceplate for NTE5.

3. Disconnected every electrial item in the home including the freezers.

4. Tried different routers.

 

What are your thoughts?

To my understand it seems that the line is getting high levels of crosstalk/interference thats causing the re-syncs.

As stated, online gaming, streaming and even watching a movie on the YouView box is too annoying for words.

 

Thanks for any advice you can offer.

 

Best Regards

 

Bill.

 

 

 

 

 

 

 

 

 

 

 

 

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Distinguished Sage
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Message 2 of 3

Re: BT Infinity 2 HomeHub 5 DSL Re-sync issues?

have you tried using the existing eci modem with your hh5?



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WildBill
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Message 3 of 3

Re: BT Infinity 2 HomeHub 5 DSL Re-sync issues?

Hi Imjolly,

 

I did try connecting HH5 (Wan Port) to the OpenReach ECI modem but could not get the YouView box to work. It also kinda defeats the object of having an all in one unit. (Wifi on HH5 is weak hence I bought the Asus router.)

 

The OpenReach modem is also locked so I cannot get any line stats from it to see whats happening and whether it re-syncs or not. I know I can buy an unlocked one from a certain website for about £40, but trying to get support from BT using tampered with items is not the way forward for me. Hope you understand. 🙂

 

Best Regards

 

Bill.

 

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