CMTS 1000 Lab environment | docsis.org

You are here

CMTS 1000 Lab environment

4 posts / 0 new
Last post
Anonymous (not verified)
CMTS 1000 Lab environment
I am still trying to see if I can get a sample setup from scratch running for a used CMTS 1000 I purchased. I've been playing with the CLI but don't really know what configuration settings to make. Besides that I imagine I may not even have the correct connections, etc. in my lab environment. Could someone please verify that the diagram here is feasible to get working in a lab environment? Do I need any attenuators or anything at such short distances? [img]http://www.eautoportal.com/temp/cmts/cmts-1000-lab-setup.jpg[/img] Original link here: http://www.eautoportal.com/temp/cmts/cmts-1000-lab-setup.jpg
DocsisAdmin
CMTS 1000 thread

I don't know anything about those units, but I do see a config for an Arris 1000 posted at http://www.docsis.org/node/135

There might be more info on the search: http://www.docsis.org/search/node/cmts+1000

That might give you a starting point. As for attenuators, it's likely that you'd need at least 20-30db on the return. The minimum transmit level of a modem is around 25db, but the return ports are normally configured to take ~0db. The sample config also shows the xmit at +59 so you'd need to lower that or use at least 50db of padding there too. With some of the config file generators and provisioning software at http://www.docsis.org/node/183 you might be in business.

Good luck-

thread7 (not verified)
If I look at this diagram on

If I look at this diagram on Cisco's web site [url]http://www.cisco.com/en/US/products/sw/netmgtsw/ps1982/products_configur...
I notice that they have an upconverter and are also using a spectrum analyzer. I can't imagine why I'd need the upconverter in just a test environment. As far as the spectrum analyzer, might I not need it and just get lucky on the power levels by setting it in the CMTS 1000 and hope I get the right amount of downstream to the CM?

booker (not verified)
I believe the 1000 has a

I believe the 1000 has a built in upconverter so no need for that. Also there really is no need for a spectrum analyzer in a lab enviroment. You will need to put about 45db of attenuation between the modem and the diplex filter which should get you to a usable level on d/s and u/s. You will also need to set up some type of provisioning server as mentioned above. Good luck.