Ofcom tweaked the Annex M mask (the range of frequencies used for the
upstream) for the UK from the international standard. To be compliant with
the "Access Network Frequency Plan" (or "how you use a copper line in the
UK") the UK specific frequency mask should be used.
As (now) stated in the Cisco dats sheets they dont support the UK mask.
Though that data sheet amendment is relatively new.
I would therefore question the providers of LLU services that have an Annex
M service working with current Cisco hardware whether their exchange
equipment also implements the ofcom ANFP with regards to Annex M.
I beleive code enhancements from Cisco to be UK compliant are coming.
http://www.niccstandards.org.uk/files/current/nd1405_2005_08.pdf?type=pdf
Section 6.6 & 6.8 refer to the above issue.
Dean
----- Original Message -----
From: "Alex Pimperton" <[email protected]>
To: <[email protected]>
Sent: Monday, September 28, 2009 9:28 AM
Subject: Re: [c-nsp] HWIC-1ADSL-M
This is an interesting one. I've used 877-M and 1801-M with Be/O2 and
don't have a problem on Annex M.
On Friday I tried both with a Tiscali (via Griffin) service and
couldn't get it to sync at Annex M. When they re-graded it to remove
the Annex M it suddenly synced, but now we are seeing pretty bad QoS,
mostly packet loss. Doesn't seem to be line (SNR) or bandwidth
related, but there is significant error correction activity on the
downstream link which I find strange.
I have heard rumours about Cisco kit not liking the Tiscali DSLAMs but
can't find anything to back this up.
Thanks Richard,
I've also heard rumours (http://piersdaniell.com/wordpress/?p=102) but as
it's the blog of a chap who works for the competition I'll take it with a
grain of salt!
I actually wanted to use Nildram but after about 5 goes at getting
compatibility info out of Nildram tech support I gave up.
Looks like it'll be Be as various people have confirmed that working.
Cheers for the help.
Alex
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