Question concerning BPI

[rabby]

Have just modded a sb5100i with SB5100MoD.1.0.4.Beta.bin
the only thing I set in there was the Mac.

Don't know what the default is for BPI in the SB5100MoD.1.0.4.Beta.bin
firmware but I havn't enabled or disabled anything there.

I was on the verge of trying different settings via telnet
when it suddenly connected - Lucky me.

The Mac I am using is on my UBR but it is way down the
bottom of the list of my sniffed macs and worked perfectly
all last night on an ambit.

[mattjames78]

Maybe certain areas are letting them on still...Here in Nottm, I have had none work. Went through dozens last week. Same old registration complete/activation page. Tried manually putting config in, changing NIC mac/BPI/steath etc etc but nothing. I`d be interested to see a nonvol from that modem blakey if you could put one on chap!

[eamon187]

the reason why the bpi 1.1 setting doesnt work in most cases is because it has embedded security in it and these macs also run on a different frequency than 1.0 macs apparently when all the 1.0 ones are turned off its going to be a bitch to get a mac to stick
187

[hethemlrijk]

ffs, BPI+ or docsis 1.1 or whatever you wwant to call it validates the modem with its certificates, if they aint legit ones (either self signed or none at all) it wont allow the CM access to the network. BPI usually used on DOCSIS1.0 is okay as the these validations are not in place in BPI. However the network does say to the CM that the BPI registration is mandatory, so you must do it else no access yet again (even though it doesn't validate the CM properly)

[sputnikk]

Originally Posted by eamon187

... and these macs also run on a different frequency than 1.0 macs

Eh, no - I don't think so.

Every MAC i've got locks at 40275, and loads are Docsis1.1. (Granted, there are problems after locking onto a downstream freq, but they still lock.)

I though that Docsis was only a standard and determined (amongst other things) the upstream/downstream throughput of the channel (at least 42.88 Mbit/s per channel downstream for Docsis, 55.62 Mbit/s per channel downstream for EuroDOCSIS)

My understanding is this: The reason that your cable modems know to lock on the x MHz DOCSIS QAM channel and not the other QAM channels is because the DOCSIS QAM channel is transmitting Sync, UCD and MAP messages. A cable modem will lock to all 64-QAM and 256-QAM channels (as per the Docsis standard - 16-QAM for upstream and Docsis 2.0 and 3.0 also specify 32-QAM, 64-QAM and 128-QAM for upstream), but if they do not have the three above messages, they will move on to the next QAM channel, lock and look for the messages.

I'm very wet behind the ears with all this stuff, so if i'm giving out wrong info here, someone correct me.

I'm pretty interested in all this stuff and if i'm misunderstanding something, it's better that I get it correct.

[Gnu B.]

watching this thread with interest.

[MorriSoft]

Originally Posted by sputnikk

Eh, no - I don't think so.

Every MAC i've got locks at 40275, and loads are Docsis1.1. (Granted, there are problems after locking onto a downstream freq, but they still lock.)

I though that Docsis was only a standard and determined (amongst other things) the upstream/downstream throughput of the channel (at least 42.88 Mbit/s per channel downstream for Docsis, 55.62 Mbit/s per channel downstream for EuroDOCSIS)

My understanding is this: The reason that your cable modems know to lock on the x MHz DOCSIS QAM channel and not the other QAM channels is because the DOCSIS QAM channel is transmitting Sync, UCD and MAP messages. A cable modem will lock to all 64-QAM and 256-QAM channels (as per the Docsis standard - 16-QAM for upstream and Docsis 2.0 and 3.0 also specify 32-QAM, 64-QAM and 128-QAM for upstream), but if they do not have the three above messages, they will move on to the next QAM channel, lock and look for the messages.

I'm very wet behind the ears with all this stuff, so if i'm giving out wrong info here, someone correct me.

I'm pretty interested in all this stuff and if i'm misunderstanding something, it's better that I get it correct.

You're not far off mate, along the right lines..

Docsis - Laymens Terms:

The DOCSIS architecture consists of two primary components.
1) A cable modem located with the customer and
2) the cable modem termination system operated by cable service providers.

The second function is to perform as a Hi Speed way station for multiple cable modems and then communicate with the system network. DOCSIS defines protocol for bi-directional signal exchange between these two components through the use of cable.

A brief History:

DOCSIS 1.0 debuted in March 1997 and is what most consumers typically link with high speed cable Internet access. This version facilitates a downstream traffic transfer rates of 27-36 Mbps over a radio frequency (RF) path in the 50 MHz to 750+ MHz range, and upstream traffic transfer rates between 320 Kbps-10 Mbps (average 5 Mbps) over a RF path between 5 and 42 MHz. In layman's terms when more people who use DOCSIS 1.0 are using the Internet the slower the overall speed will be for customers.

DOCSIS 1.1 can coexist with DOCSIS 1.0, but features an increased upstream data transmission and improved security. This version facilitates multiple services such as voice and streaming. The end result is faster transmission and reception with a greater inventory of features.


DOCSIS 2.0 has an added capacity for symmetric services by operating at 64 QAM, backed by a new 6.4 MHz wide channel. Enhanced modulation and improved error correction ensures that this standard offers an increased bandwidth for IP traffic.

The upstream traffic DOCSIS 2.0 is above 30 Mbps which is 3 times better than DOCSIS 1.1 and 6 times faster than DOCSIS 1.0. DOCSIS 2.0 is interoperable and backward compatible with DOCSIS 1.x. Long story short - this version works with both of the others but remains much faster and exhibits fewer errors.

Then of course, there is Docsis 3.0 which I don't know enough about to go into detail just yet, but since only 50meg modems on VMs network use this version of the docsis architecture, I think we'll do without for now

[sputnikk]

So i'm correct in thinking that Docsis1.1 describes protocol (QoS specifically) and has noting to to with the downstream frequency at all (which will be in the 50-750+MHz range)?

[toolzkit]

good post MorriSoft

[anthrax]

ive noticed i have more luck , when the modem stealth settings r spoofed to correct modem for the mac, as it seems certain macs r from differnet makes of modem. so if u have say a 0002 / 0004 mac spoof it to an ambit , or if its 00d0 mac spoof it as an sb modem , seems to work for me , unless its coincidense?? but now im doing this its seems i can get about 70% of macs to work eventually appose to 2% well, also say a mac will work on docsis 1.0 in my area i can take a few miles away and the same mac wont work until u change to docsis1.1 than woila works again! strange but true!, so the docsis, seems to be by area rather than by mac. dont know if this is what is meant to be done , but its what ive found anyway!

and once u get 1 online, download the nonvol settings and the config file for working modem, then when u do anymore u can revert to factory defaults first then upload the confif and nonvol settings then go ahead and set up modems,as by the 'sysncing hax tutiorial' in downloads,

and remember alwasy change settings with casble feed out, and when u try differnet macs , change the nic mac each time......, there an easy way to do this if u dont use smac and use xp not sure if same in vista or windows 7, though i thjink it prob is very similar once u get to the net adapter page , if u look up when of my thread called something like 'how to change nic mac easily'

How to spoof you 'nic' mac easily with xp