Docsis chat

Hi all,

I’m quite new with the DOCSIS technology. Maybe it’s a simple question, so don't think that I’m a fool ;)

We created a test setup with the following components:
1. Arris C4 CMTS
2. Arris WBM760B (High Speed Data) This part works
3. Arris TM722B (High Speed Data and VOICE) Only the High Speed Data works
4. Debian DHCP and TFTP server for provisioning

The problem is that we aren’t able to get the EMTA’s online for a TM722B modem. So everything works fine except the voice part. We only see DHCP requests from the CMAC’s, is this normal?

Hello,

How long does the 1500 store the offline modem history after the modem has been offline? I realize once the CMTS is restarted it's gone. I thought that the purge-fdb command was supposed to clean that out. So I guess my final two questions are: How do I clean out offline modem data and what does the purge-fdb command actually do?

Thanks,
emkowale

Does anyone know what OID I would poll to get the temperature of the Arris C3?

Thanks,
emkowale

Can anyone advice me on what a fair cost would be for a Residential and Business line.

Is is cheaper to DIY or outsource. And if you Outsource whats fair price to pay.

Hi Group

I have a BSR2K and I want to change DS modulation from 64qam to 256qam to increase throughput. Is there any chance cable modems go offline when changing modulation? Issues related with this? I know in US modulation change, the SignalQuality goes down but I think is not the same in DS.

Thanks in advanced.

Hi!!

I have a problem, i want to make nat using Motorola BSR 1000, and i don´t found nat function in the IOS, and i want to know if it is possible in that CMTS ???

PD: i want to make nat using a pool of public ip addresses using that Motorola BSR.

Thanks.

Hi All,

i've been lurking the forum for a while and it helped me a lot al ready!
i got the whole system online including MTA's!

But now i want to split up the CPE network to different subnets, so this can be filtered by a transparant firewall.
e.g.

CM 1 - ip 10.20.0.5\24
CPE 1 - ip 172.16.0.10\24
CM 2 - ip 10.20.0.6\24
CPE 2 - ip 172.16.10.10\24

Provisioning :
Linux Debian distro
DHCP ( 2 pools, 1 for CM, 2 (or more) for CPE)
TFTPD
DNS
NNTP
MYSQL (DB with mac address + ip address CM network) --> managing our static hosts.conf for provisioning the CM's
+/- 300 CM

I think I mentioned before, I'm new in this.. so sorry if i bother too much.
and thanks if you understand me.
im very interesting in learn everything I can in this environment.

USING: uBR7246VXR

I recently got interested in estimate the consumption of bandwidth.
how could i do this...

i know how much total bandwith is generated monitoring the internet router directly.
Also i can generate graphic with mrtg tool.
but i cant know how that traffic is distributed in the cable modems.

example:
Total traffic was 1460kbps 2:00 pm
if I have only 3 cable modem connected

Hi Group,

I'm trying to understand how to calculate the Max-Burst-Size in the CM-configfile.
For that I took some specification RFI,DRFI,DVB and some cisco-pages and what
I could find in the web.

So what I figured out is the way to calculate the upstream-max-burst-size:

Assuming Modulation is 16-qam and Minislotsize 4 (Symbolrate=64)
= 4 (Bits_per_Symbol) * 64 (Symbol_Rate) = 256 (Bit) / 8 = 32 (Byte)
= 255 (max_minislots) * 32 (minislotsize_in_byte) = 8160 (Max_Burst_Size)

Assuming Modulation is 64-qam and Minislotsize 4 (Symbolrate=64)

Hi,
Fairly new around here, but I've been performing tests on our mini CMTS for a while, using a linux DHCP/TFTP server.
I need to create some new test scenarios, where I serve different CM config files to the various modems.
I have a batch of Hitron, Motorola and Castlenet Modems on the system, and I want to give them each type a different config file in the dhcp.conf
How do I go about this? I currently use a symbolic link (cm.0) to the CM config file on the TFTP server, which works fine.
essentially, I want to use cm.0, cm.1, cm.2 for the modem groups.

current config file:

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