FTTC Modem: Difference between revisions

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[[Category:Routers]]

[[Category:FTTC]][[Category:Modem]][[Category:Configuring]][[Category:Router]]

=No longer supplied=

= Related Pages on the A&A Website: =

Note, these Openreach modems are no longer supplied, but they can still be purchased from some 'auction' web sites.

⚫

With FTTC, BT OpenReach used to supply and install a VDSL modem (the Active NTE in BT speak), You will then need a PPPoE device (router or software) to use the service.

*[http://www.aaisp.net.uk/broadband-FC.html www.aaisp.net.uk/broadband-FC.html]

----

⚫

With FTTC, BT ~~will~~ supply and install a VDSL modem (the Active NTE in BT speak), You will then need a PPPoE device (router or software) to use the service.

*PPPoE Service Name = Blank

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*PPPoE password = as supplied

*MTU = 1500 (if your equipment can handle baby jumbo frames and [http://www.faqs.org/rfcs/rfc4638.html RFC 4638]), otherwise 1492

*Auth Protocol CHAP

*Auth Protocol = CHAP

= FTTC Modem =

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*Huawei EchoLife HG612

Openreach tend to install the FTTC modem to match the DSLAM in the Cabinet. However, ~~we're think~~ they ~~may be moving to~~ installing ECI modems whether the DSLAM is an ECI or not.

Openreach tend to install the FTTC modem to match the DSLAM in the Cabinet. However, later they were installing ECI modems whether the DSLAM is an ECI or not.

[[File:FTTCModems.png|600px]]

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[[File:FTTCModem-LEDs.png|600px]]

The FTTC modem supplied by Openreach is described in detail on [http://www.~~sinet.bt~~.com/~~498v5p1~~.pdf BT SIN 498]

The FTTC modem supplied by Openreach is described in detail on [http://www.btplc.com/sinet/SINs/pdf/498v7p1.pdf BT SIN 498]

= Huawei HG612 PPP/UDP/VPN Bug=

In 2013 we discovered a bug with the HG612 which affects VPNs when the PPP drops. The shot version of the bug is that UDP session, such as a VPN, has problems re-establishing when PPP drops. This is due to the modem blacklisting the packets. More information can be found on these pages:

*https://www.revk.uk/2013/11/bt-huawei-fttc-modem-bug-breaking-vpns.html

*https://aastatus.net/1854

*https://www.revk.uk/2013/11/bt-huawei-working-with-us.html

=Router Throughput=

With the switch to FTTC (especially from low sync'd ADSL connections) your modem is suddenly confronted with throughput possibly 10 or even 20 times more than before!

{| ~~border~~="1" align="center" style="text-align:center;"

{| class="wikitable" align="center" style="text-align:center;"

|Router

!Router

|Sync Speed

!Sync Speed

|Throughput

!Throughput

|Notes

!Notes

|-

|Linksys WRTU54G-TM

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|style="color:green"|16Mb

|It should be able to handle around 350Mbit/s!

|}

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=FireBrick 2700=

The Firebrick 2700 is a great router for FTTC, and even bonding FTTC. See the [[FireBrick]] pages for more info

The Firebrick 2700 is a great router for FTTC, and even bonding FTTC. See the [[:Category:FireBrick|Firebrick]] pages for more info

=Testing and using FTTC with just a computer=

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=RFC 4638 Information=

When using a router with an external modem, one has to use PPPoE on the router as the connection method. This normally means that the MTU on the PPPoE link

can be no higher than 1492 octets (PPPoE has an 8 octet overhead, and the whole packets has to fit in a 1500 octet Ethernet frame). However there is a

can be no higher than 1492 octets (PPPoE has an 8 octet overhead, and the whole packets has to fit in a 1500 octet Ethernet frame). However, there is a

technique to use ''baby jumbo frames'' to extend the Ethernet frame size to 1508 octets and allow the full 1500 octets on the PPPoE link.

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=RFC 4638 OpenWRT 12.09 (Attitude Adjustment)=

A brief guide is available at http://monki.org.uk/blog/2013/04/14/patching-openwrt-for-bt-fttc/

Patches for WNDR3x00 are available at https://github.com/mattwillsh/openwrt-wndr3x00-rfc4638