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change dsl mode on cisco 877 -Cisco and BT issue

hi all,

NB - I will need an idiots guide to this.

I have a new client who has a BT ADSL2+ installed with a Cisco 877 router. The router link is up and down like a yoyo - more down than up

I have come across this before with a draytek and it wsa due to the dsl modulation being set to auto as opposed to a specific adsl2+ modulation. That one needed to be set to ADSL2+ (Annex M) for example

if you can give me an idiots guide to this it would be really helpful. If you have any other ideas that would be great.

TIA
Gareth
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gareth629
Asked:
gareth629
1 Solution
 
macoronatCommented:
You need to check that you have this product part number:  CISCO877-M-K9 (or at least, that the product number of your router has an "M" in it).  If not, you won't be able to connect to a DSL line with Annex M operation mode.
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Craig BeckCommented:
Cisco 877 routers have known issues with BT ADSL2 and 2+.  There is a bug in the firmware on these routers apparently.

I've installed lots of these in the past and never had any luck, however there appears to be a release of firmware which is stable with BT's 21CN... v4.0.195

If you have a SmartNET agreement you can download this from Cisco and copy it to the flash on the router.  When it reloads it will use the new firmware.

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gareth629Author Commented:
Hi All,

thanks for your help, I ended up replacing the router with a Draytek which works a treat.

for completeness on an ADSL2 BT line the modulation needs to be G.DMT.

thanks
Gareth
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gareth629Author Commented:
Cisco and BT do not play well together.
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