Re: ADSL interface attenuation
- From: bod43 <Bod43@xxxxxxxxxxxxx>
- Date: Sat, 29 Nov 2008 13:58:48 -0800 (PST)
On 29 Nov, 17:58, alexd <troffa...@xxxxxxxxxxx> wrote:
Philippe wrote:
I have at home a Cisco 857W router connected to an ADSL line. Very
briefly, I need this equipment because I use the time-range based ACL's
to manage Internet use at home. This i why I bought it instead of using
any Netgers or Linksys box.
Zyxel routers can do time-based access rules.
I am quite far from the DLSAM (local loop is 4.600 m long ...) and the
attenuation of the loop (52 dB) is very close to the upper limit (53
dB).
I have heard many people recommend 2Wire ADSL routers for long lines, being
able to hold onto sync with very low noise margins. Don't know if they do
time-based ACLs, however.
Out of interest which country are you in
and who is your ISP? Getting a DSL
provider to even look at technical details
has been in my experience rather difficult.
(OK impossible).
I can confirm that there seem to be issues
with older 857 ADSL firmware. My experience has been
that some lines would not come up or were unreliable
until the firmware was changed. This was in the
UK with BT.
Definately worth trying an upgrade.
The other thing that I found to "work" on at
at least one ocassion was to change the
"dsl operating-mode" from auto to
the other options in turn. In the UK BT
for example works with either of the
options, ansi-dmt itu-dmt).
Of course of you are on ADSL2 then
these oprtions won't be suitable.
Easy to try.
Just so you know what is available:-
I am using IOS 12.4(15)T7 which comes with
DSL firmware "FW Version: 3.0.14".
sh dsl int atm0
The firmware is available seperately from
the IOS and is a free download.
Details on this newsgroup.
ftp://ftp.cisco.com/pub/access/800/
This seems to work again now but
has been 'resting' for a while.
You just put the file in the routers flash,
NOT accepting the "ERASE FLASH" option
if offered.
then rename it to whatever it says in the
release notes and reboot.
adsl_alc_20190.bin or something like that.
Note that the site (or maybe my firewall?)
requires passive ftp.
Site has also 3.0.33 and 4.10.9.
Read the release notes to make sure they
apply to your router. It may say that
it is only compatible with IOS x.x.x
but you basically need to ignore that
if you have a later IOS.
The ones that gave trouble were early 2.x.x.
I have had no problems at all with 3.0.x
but have not tried 4.x.x.
.
- References:
- [Cisco 857W] ADSL interface attenuation
- From: Philippe
- Re: [Cisco 857W] ADSL interface attenuation
- From: alexd
- [Cisco 857W] ADSL interface attenuation
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