[nsp] UBR 7114 testing rig

[Christopher J. Wolff]

Scott,

While changing the power levels the cable modem dropped to -9 and the
modem connected.  I'm assuming now that I'm running the output too hot
for the modem and need to add an attenuator.

Christopher J. Wolff, VP CIO
Broadband Laboratories, Inc.
http://www.bblabs.com 

-----Original Message-----
From: Scott Morris [mailto:swm at emanon.com] 
Sent: Wednesday, July 16, 2003 9:12 PM
To: 'Christopher J. Wolff'; cisco-nsp at puck.nether.net
Subject: RE: [nsp] UBR 7114 testing rig

Do you have a dhcp server in place for it?  

The * means that noise power adjustment is active for the modem  (if you
see a ! There, the modem is talking as loud as it can).

I could step you through good debugs, but the best ones come if you have
a Cisco cable modem!  (If you do, do a 'debug cable mac log' on it and
it'll tell you all sorts of good stuff!)

Scott

-----Original Message-----
From: Christopher J. Wolff [mailto:chris at bblabs.com] 
Sent: Thursday, July 17, 2003 12:01 AM
To: swm at emanon.com; cisco-nsp at puck.nether.net
Subject: RE: [nsp] UBR 7114 testing rig


Hi Scott,

I've been successful with a combiner that I found.  I can see the modem
as follows;

Interface   Prim Online    Timing Rec    QoS CPE IP address      MAC
address
            Sid  State     Offset Power
Cable1/0/U0 1    offline    1226   *6.00  2   0   0.0.0.0
0090.838d.f6b5

At this moment I do not understand the SID error I'm receiving but need
some ideas on how to get the modem online.  Thank you for your reply.

Christopher J. Wolff, VP CIO
Broadband Laboratories, Inc.
http://www.bblabs.com 

-----Original Message-----
From: Scott Morris [mailto:swm at emanon.com] 
Sent: Wednesday, July 16, 2003 8:58 PM
To: 'Christopher J. Wolff'
Subject: RE: [nsp] UBR 7114 testing rig

You will likely need a bit more attenuation than that.  :)

Presuming you are outputting from your upconverter port at +55 or so,
you will likely need about 50'ish more db of padding on there depending
of course on the quality of your splitter.  (-3.5db per split (2:1 = 1
split) on a decent splitter)

Watch the placement of your padding as well because you have to take
into account how "loud" your CM will need to transmit back as well.  The
goal is to reach nominal level (0'ish) db by the time your signal gets
to the end.

Hope that helps!

 
Scott Morris, MCSE, CCDP, CCIE4 (R&S/ISP-Dial/Security/C&S) #4713,
CCNA-WAN Switching, CCSP, Cable Communications Specialist, IP Telephony
Support Specialist, IP Telephony Design Specialist, CISSP, JNCIS,
INFOSEC CCSI #21903 swm at emanon.com


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Christopher J.
Wolff
Sent: Wednesday, July 16, 2003 6:29 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] UBR 7114 testing rig


Hello,

I have a UBR7114 and a Toshiba cable modem I'm testing for an upcoming
project.  "I've been told" that I can run the upconverter and
downconverter output into a 2 to 1 splitter and plug it right into the
cable modem.  Unfortunately this is not the case.  Has anyone else set
up this type of testing rig with a UBR?  Thank you.

Christopher J. Wolff, VP CIO
Broadband Laboratories, Inc.
http://www.bblabs.com 


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