Cisco 837 & BT 21 century upgrades

Unanswered Question
Jan 22nd, 2010
User Badges:

I have been advised by our ISP that problems with loss of CD are the result of BT having upgraded their exchange to the 21st Century IP network. We recognise that the 837 does not support ADSL2/2+. However does the fact that the router does not support ADSL2+ mean that it will not be compatible with the basic ADSL level services with the new exchanges? If so is there a fix to this? I have seen that there are firmware upgrades to other integrated services routers such as the 836 and 877, is there one we can obtain for the 837?

Many thanks any pointers on this.


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Giuseppe Larosa Sat, 01/23/2010 - 13:10
User Badges:
  • Super Silver, 17500 points or more
  • Hall of Fame,

    Founding Member

Hello Alan,

per standards ADSL2+ is backward compatible with ADSL1, ADSL2 is not.

So ask them if their line is ADSL2+ or ADSL2.

UK scenario looks like different there have been several threads about problems also with ADSL2+ implementations (different flavours)  on the router side with exchange of informations about DSL firmware to use.

for example

Hope to help



This Discussion