What's going on?

Hi all,

I have a cisco box, and it's showing thus..

Via SNMP/cactus reckons
Actual Linespeed 1192000/14199000 bps
ADSL currently trained at 1204000/22538000 bps
Current Noise Margin 6/19 dB, Current Attenuation 3/10.5 dB

and my provider's guestimation is that I should get a good 20Mbp/s service.
also, from what I've read. those stats are ok, and shouldn't be causing any issues?.
I'm not that far from the exchange, and never had any issues with an ADSL1 service.

ok, looking good.... but...


Alcatel 20190 chipset information
ATU-R (DS) ATU-C (US)
Modem Status: Showtime (DMTDSL_SHOWTIME)
DSL Mode: ITU G.992.5 (ADSL2+) Annex A
ITU STD NUM: 0x03 0x2
Chip Vendor ID: 'STMI' 'BDCM'
Chip Vendor Specific: 0x0000 0x918F
Chip Vendor Country: 0x0F 0xB5
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x0000 0x0000
Modem Vendor Country: 0xB5 0x00
Serial Number Near: FCZ121362M3
Serial Number Far:
Modem VerChip ID: C196 (0)
DFE BOM: DFE3.0 Annex A (1)
Capacity Used: 63% 99%
Noise Margin: 19.0 dB 6.0 dB
Output Power: 18.5 dBm 12.0 dBm
Attenuation: 10.5 dB 3.0 dB
Defect Status: None None
Last Fail Code: None
Watchdog Counter: 0x25
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction: 0x00
Interrupts: 20546 (0 spurious)
PHY Access Err: 0
Activations: 4
LED Status: ON
LED On Time: 100
LED Off Time: 100
Init FW: init_3.0.33_nobist.bin
Operation FW: AMR-3.0.033.bin
FW Source: external
FW Version: 3.0.33

DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 14199 0 1192
Cells: 0 6728 0 697650
Reed-Solomon EC: 0 0 0 0
CRC Errors: 0 0 0 0
Header Errors: 0 0 0 0
Total BER: 0E-0 0E-0
Leakage Average BER: 0E-0 0E-0
Interleave Delay: 0 56 0 11
ATU-R (DS) ATU-C (US)
Bitswap: enabled enabled
Bitswap success: 0 0
Bitswap failure: 0 0

----------------------------------------------------------------------------------------

What ever I do, I can't get above 14199bps, I'm wondering if I'm capped for some reason because I'm using a cisco box (supposedly industry standard equipment...)

Cisco people, what's your thoughts ?

MisterG

Chip Vendor ID: 'STMI'

There's your problem.

Who's the ISP?

And the problem with Alcatel / Thomson / Infineon is ???

You are trained at 14199kbps, the max attainable rate is 22538kbps according to the routers stats.
From the line stats (downstream attenuation is 3dB) you should be a little bit faster though. If you have a access to the Cisco site there are a couple of later firmwares for the adsl modem which are to fix instability issues, not sure if they will help though.
Your downstream noise margin does seem rather high at 19dB.

I take it you have tried all the usual checks of plugging the router into the NTE test socket ??

Maybe worth trying a router with a Broadcom chipset, even if you have to get a good 2nd hand one via ebay

In reply to a post by Rockh:

And the problem with Alcatel / Thomson / Infineon is ???

Who?

STMI is Alcatel, Thomson

No, it's STMicroelectronics

Good point, yet to fire up my Cisco on my new O2 connection as the O2 II box seems to be working just fine and as they share a similar chipset should be similar however might play with the old Sky DG834 router since that's a broadcom IIRC.

So thats why Cisco use Alcatel chips then .......

What is?

RockH

Many thanks for a sensible reply,

yes, the router is plugged into the NTE, I've a solwise version that has the integral uFilter. but I did wonder about the stats. hence I've got a ticket open regarding this issue.

I wonder if this router has a slightly iffy ADSL interface, that's taken a hit from something on the line in a previous life. as the stats did look a little odd compared with 837 when it was running on an 8Mb service. I wasn't exactly sure what the 22538kbps was, Thank you clarifying that.
I'm not CCNA, but can just about glue/hack a config together and debug it and leaning about ADSL in a cisco world.

I only have cco access to cisco hence why the firmware is only at .33, I understand there's 4.x around, but I can only find the version 4 for the 837 in the wild.

Again, Many thanks for you reply

"plastic box" routers, always imho seem to have other issues that'll be fixed in the next realease, (as well as cooking themselves) and cannot and will not offer the sort of feature that Cisco software dose.
Plus, the 837, togther with a Prosfe WAP, was the most stable thing I ever used, uptime of well over 12 months, I had interface up times of several months... I've not come across a white netgear/thomson that'll do that...



Regards
MisterG

In the absence of a sensible answer to the question about your ISP, I suggest you try a plastic-box alternative router based on a Broadcom chipset to help isolate where the problem is. Maybe your ISP has provided one, but so far you haven't tried it.

the 19 dB downstream margin is the odd one, if you restart the interface (or the box) does it go back to the same figure ?

Could flash the sky dg834 with dgteam firmware, gives you a lot more options to tweak? I don't know what is on it under sky, but I brought an ex sky router and flashed it with that, works fine.

That is, if you haven't already

Edited by deleted (Thu 10-Dec-09 20:36:01)

how do

ive got the 877 annex m, wireless g, euro spec one

although my connection seems to be more stable with the cisco, my sync rate is allot slower than my o2 wireless box III, i think it down to the chipset and the extensions on the dslam

you'd be fighting an up hill battle trying to get o2 to loosen its grip! id like to use my cisco too, seem to handle everything allot better than this o2box

but then you come up against the dreded "loss of routing" problem

ive havnt tried the v4 of the modem firmware, ive read that it reduces sync further to enhance stability, let me now how it goes i may give it a whirl

laters