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downstream capacity cmts bsr1000
Mon, 06/20/2011 - 13:21 — flavio.mali
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Hi guys. Excuse my poor English. I have a small cable TV operator in southern Brazil and I'm having a problem with the following CMTS bsr1000. between 18-19h 23-00h and he can not reach its maximum capacity, it seems that acting is a limiter. I did a test between now and 3:40 p.m. to 3:50 p.m. h download forced to dye reached maximum capacity and no problems but noted that in the chart below it does not reach these hours. any suggestions?
Config
Hi Flavio
It would be better to post your bsr1000 configuration specially your downstream modulation. I think it's a problem of your PRTG in average measure.
Best regards,
config bsr1000
hi! Thank you for your interest. attached configuration of the downstream, it is 256QAM not believe how you imagined 64QAM. cmts1 also attached the bsr1000 curve and having a normal consumption. cmts2 already seems that there comes a time and not spend more than 32mbps WHAT been proven physically. could even imagine a hardware problem but he gets to have a transmission rate close to 38mbps as seen just before hitting the 32mbps. work has a 6 year with this CMTS never seen it going on.
Rate Limit
Hi Flavio
Could you post your running config? leave passwords and networks out. what is the total number of modems on the system and what is the average modem getting for downstream speed via the modem config file? specs for the unit says domestic docsis is 38 Mbps at 256Qam. that's what any cmts would give you because of docsis overhead.
http://www.latin-broadband.com/PDF/CMTS%20&%20Routers/BSR1000_513710-001...
~Carl
config data
Dear Carl;
Data attached. WHAT is certainly hoped that the downstream rate reached its maximum at 38mbps as has happened on other occasions. the problem is that between approximately 20:00 to 21:00 h to 23:00 to 00:00 h with the same 5-6Mbps to eat it is parked at around 32mbps. it is as if this were the limit and have no server practicing traffic shaping. this very strange behavior.
Flávio.
Have you
already check Internet Service? any restriction on clear channel perhaps? It's very rare...
Upstream
upstream goes hand and hand with downstream. your running qpsk on the upstream, so figure around 3 Mbps shared bandwidth. over 200 modems per receiver, even though each modem only gets about 512k. what do you get for an output when you run show stats 0 cmts? sh controllers cable 0/0 | in SNR ? are you running bpi+? possible theft issue? shared secret configured? all just thoughts
~Carl
Resolved
Guys, the problem was not in the CMTS but I use a firewall ISA Server is installed to test a software (surfcop) for bandwidth management, did some testing and after uninstall but do not know why a rule was applied. I have reinstalled the software is to uninstall and I think the problem is resolved. See attached chart of a CMTS normal consumption of a little overwhelmed. Thanks for the replies.
Att
Flavio.
good to know problem solved
I'm glad you solved the problem.
See you