The problems with BT Openreach ECI modems.ECI modem - Issue 1 8th Jan 2015
: ECI modems with old firmware connected to a G.INP enabled DSLAM, will appear to have sync but are not able to complete the initialisation process or get a PPP session.Problem
ECI modems cannot to connect to the Internet. Sync light is on.Solution
EU's will need to contact their ISP to arrange an Openreach Engineer to perform a DLM reset on the line. This should remove the ReTX profile and allow the ECI modem to sync up and be able to download the latest firmware.
Openreach engineers are only allowed to perform a DLM reset if a hard fault has been found. A faulty ECI modem is considered a hard fault. Note:
If you have internet access using the modem, then it will have been updated with the latest firmware. Issue 1 is separate to issue 2 and where a lot of people are mixing up facts ECI modem - Issue 2
Large increase in latency and reduction in connection speed.Problem
Users with ECI modems are reporting doubling of latency and large decrease in sync speed.
We are seeing ever increasing numbers of users complaining of massive increases in ping times such as 9ms > 30ms > 50ms and loss of sync speed anything up to 15Mbps. Users who are literally next to the cab and previously syncing at a full 80Mbps with no interleaving have seen speeds plummet to 67Mbps.
ISP's may see blank results when performing a GEA test on the line. Solution
As yet there is no fix. BT have not responded to any enquiries about this.
Calling out an Openreach engineer for a request for DLM reset is of no use. DLM resets either will not take or will not stick.
Due to lack of an official response, we can only conclude that it would appear that the ECI modems are not compatible with g.inp and the above firmware 'fix' that was rolled out, was simply to enable the modem to connect to the BT network.
Any lines which are connected using an non-compatible g.inp modem/router appear to default to a DLM profile that applies fairly heavy interleaving and error correction overheads.
Whether this is by design or not is unknown. It is known that BT first commenced G.INP trials on a limited number of lines in 2013, which is before the DLM changes in Nov 2014 due to the ASSIA court case†
It's looking increasingly likely that the ECI firmware update mentioned in issue 1 simply sets the ECI modem to RETX_ENA=1, yet the modem seems to be incapable of performing ReTransmission correctly hence why we see Issue 2. See this post
for more details.
The only solution we can offer is:
1). Wait and see if BT give an official statement and announce if they are able to release yet another f/w update for the ECI modems and/or if they can make changes to the DLM system which is less harsh for non-compliant modems.
2). Purchase a compatible modem/router.
Use of a compatible G.INP modem/router returns the DLM to normal within 24hrs or so.
AAISP are still waiting for a reply - link
- 1) "The f/w not been updated because the modem is connected to a line that is attached to a DSLAM that does not use the same chipset as the modem".
False: G.INP is standardised technology regulated by the ITU. G.998.4 should work regardless or not of the manufacturers chipset. If its not working then it doesnt have G.998.4 technology enabled. Also if the modem hadn't received the update then it wouldn't be able to connect to the internet.
- 2) "The modem's firmware is not updated until the DSLAM has had it's firmware updated."
False: BT have been rolling out ECI modem firmware for a good while. Software is updated automatically using the BTAgent and/or VLAN 301 regardless or not if the DSLAM has been upgraded
- 3) "The modem's firmware is updated when the DSLAM pushes the firmware onto the modem".
False: BT have been rolling out ECI modem firmware for over a year. Software is updated automatically using the BTAgent and/or VLAN 301 regardless or not if the DSLAM has been upgraded. The upgrade for the DSLAM is an entirely separate process.
Huawei HG612 modems.
These should be fine and work well as long as they have been upgraded to the latest firmware.
Anyone using an unlocked HG612 should ensure they are using HowlingWolfs latest firmware B030SP08
This will show in your stats as
Software version V100R001C01B030SP08
Firmware version A2pv6C038m.d24j
Compatible Modem/Routers known to work with G.INP:
BT HomeHub 5 Type B (BCM chipset & Software version V0.07.01.0235-BT)
Draytek Vigor 2860 series - 28/04/15 Appears to only work with g.inp beta f/w available here. May also work with the vectoring f/w on the same page
Fritzbox vdsl routers - 7390 & 7490 are ok. unsure if it applies to all models.
Netgear DGND3700v1 (Custom firmware: 2015-02-08)
Netgear D6400 - Now seems to be working.
Sky Hub SR102
Talk Talk Super router (Huawei HG635)
Thomson TG589vn v3
TP-Link TD-W9980 - compatible if using f/w TD-W9980_V1_150507 .
Zyxel VMG8924Discussion on G.INP compatible modem/routers
Modem Routers showing increased latency and lower sync
The first three on the list all contain the same Lantiq VRX-268 modem chipset & SoC. All 3 appear to be showing similar symptoms.
BT Openreach ECI modem
BT Homehub 5 Type A (Software version 188.8.131.52.83.8.204)
TP Link TD-W9980. - TP-Link are working on a fix - see below
Draytek Vigor 2850 series. - 12/05/2015. Draytek currently dont have any plans to release g.inp f/w for the 2850
Netgear D6400 - Users of this router appear to be having a problem getting Netgear to acknowledge that there is an issue - see here
Now seems to be working. Updates from TP-Link.
TP-Link are aware of the problem on the TD-W990. We will keep you updated.
TP-Link are aware of a compatibility issue with the chipset which should be capable of G.INP. TP-Link R&D are jointly working with Lantiq on finding a solution for the TD-W9980.
PN User JHewess is testing beta f/w for TP-link which appears to be successfully working with G.INP on his line.
TP-Link releases beta f/w for g.inp. More information & download http://forum.kitz.co.uk/index.php/topic,15322.0.html
TP-Link hope to have news about an official f/w release soon. Problem identified with the underlying Lantiq f/w.
TP-Link releases official g.inp firmware TD-W9980_V1_150507 . - Now marking the TD-W9980 as compatible.