https://insidehuaweima5616msan.wordpress.com/

IFTN ?

In reply to a post by mixt:

DSLAM type: Broadcom (Huawei)
ChipSet Vendor Id: BDCM:0xa44f
ChipSet VersionNumber: 0xa44f

Mine is a slightly different Vendor Id. Do all Huawei cabs show up as "BDCM" or is it specifically the 0x???? string which defines the vendor? Would an ECI cab show something other than "BDCM" ?

Mine is below:

ChipSet Vendor Id:      BDCM:0xa451
ChipSet VersionNumber:  0xa451

Note, my cab has already been identified as Huawei by BatBoy elsewhere in this thread, based on looking at the Band Plan figures, so purely asking this for clarification really.

An ECI cabinet DSLAM would include "IFTN" rather than "BDCM".

e.g:-

ChipSet Vendor Id: IFTN:0xb204
ChipSet VersionNumber: 0xb204


It seems there are now 3 versions of Huawei cabinet DSLAMS in use:-

Original - 0xa44f - uses up to tone 3970 in the Discovery Phase band plan


Newer DSLAMS - 0xa451 & 0xa458 - These seem to only use up to tone 3959.

Awesome, thanks!

Posting here because it is in context to my previous parent post but in all honesty has nothing to do with the the topic of this thread.

Just had a neighbourhood wide powercut, and thought I would take a reading of the modem stats right after the power came back on.

# xdslcmd info
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason:	0
Last initialization procedure status:	0
Max:	Upstream rate = 38540 Kbps, Downstream rate = 102296 Kbps
Bearer:	0, Upstream rate = 20000 Kbps, Downstream rate = 74000 Kbps
Bearer:	1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps

IP Profile: 71.55 Mbps

Stats before powercut (see parent post):

Max:    Upstream rate = 29033 Kbps, Downstream rate = 67736 Kbps
Bearer: 0, Upstream rate = 20000 Kbps, Downstream rate = 69112 Kbps

I suppose this is most likely because everyone else on the cabinet disconnected and the readings and sync it has obtained is during a brief moment when there is no cross-talk occurring.

Pretty cool!

Anyway, I expect some further re-syncs back to what the original sync speed was. I'm sure my experience of this kind of sync speed will be short lived.

Edited by deleted (Thu 30-Apr-15 00:45:34)

I found there is a danger in not re-sync'ing yourself. Once everyone else reconnected my error rates became so high that although I kept sync for a few days at the higher speed DLM suddenly jumped in with drastic interleaving levels.

I ended up with the loss of several Mbps from my norm, for about three weeks and very high latency, until G.INP was implemented on my cabinet. That has given me my best ever "valid" connection speed and normal latency, but with a residual small amount of interleaving.

Edited by RobertoS (Thu 30-Apr-15 01:16:52)

I forgot. You now have G.INP on, which usually does improve sync speeds by a few Mbps.

Yeah, but before G.INP was enabled, I was getting ~60 Mbps. Then G.INP got enabled, and with switching to the Huawei, that rose to ~69 Mbps. Now after a power cut, it's at 74 Mbps, and the Huawei is telling me the line can do ~102.5 Mbps?!

For a line that must be ~400m long, that's pretty impressive stats (I think the Huawei is reporting rubbish).

Edited by deleted (Thu 30-Apr-15 06:47:53)

In reply to a post by mixt:

(I think the Huawei is reporting rubbish).

So do you think the Huawei is picking on you personally, or do you think the max attainable is always rubbish?

No, I think it is as you said a while ago where it calculates these max attainable values during initial sync. I guess during its re-sync after the power outage, the cabinet was pretty "quiet" due to no noise/cross-talk.

Yes, it calculates the Max Attainable during sync and with other modems still booting and little traffic a high figures can often be achieved.

However, max attainable will continually vary - I see mine changing sometimes several times a minutes - albeit small steps but is is continually monitoring it.