hi there,
we have a Cisco CMTS UBR 10012 and Thomson TCM 420 cable modems running Eurodocsis standard
the problem is that we never get upload speeds over 2,7 mbit. does anybody have some experience about cisco ubr's and configuration running Docsis 2.0
the modem is showing MAC: Docsis 2.0 QOS: Docsis 1.1 channel width is at 6,4 mhz in the upstream running qam 64 - the modem shows that he is connected with QPSK in the upstream
any help would be great
kind regards
Simon
May be the problem in logical upstream channel settings?
Post UBR config here
Sorry, I'm not a Cisco guy, but your upstream channel width says 6.4 followed by 1.6 Mhz wide? your modem file should have a max burst as well. in my setup I use 6.4Mhz wide running atdma. I couldn't attach a picture, so a link follows that shows 20.4 Mbps on my upstream with Ixia Qcheck. jperf is slightly better because it runs longer
http://photos1.hi5.com/0036/541/477/rlcDUp541477-02.jpg
Hi cmcaldas,
Have u tested throughput on upstream port of CMTS or cable modem upstream ?
Can I have your cable modem config as well as CMTS configuration..plz
Harindra
Hi Harindra,
I'm sorry for not checking the posts, I've been working on getting my docsis 3.0 working and the all the fun that goes with it lol
Please keep in mind, my setup is in a lab. but I have made changes in my modulation profile for noisy plant. I wish there was a way to attach to the post, but with Ixia Qcheck or Iperf on a domestic config on the upstream I average 14 Mbps and on my euro I can reach a little over 20 Mbps upstream.
send me an email and I can reply with the modem file, running config and snap shot from the Qcheck
Regards
Carl
cmcaldas@gmail.com
@Simon,
have you set DOCSIS2.0 enable at configfile?
here are the important config parts
ubr config:
cable modulation-profile 222 request 0 16 0 22 64qam scrambler 152 no-diff 64 fixed qpsk1 1 2048
cable modulation-profile 222 initial 5 34 0 48 64qam scrambler 152 no-diff 128 fixed qpsk1 1 2048
cable modulation-profile 222 station 5 34 0 48 64qam scrambler 152 no-diff 128 fixed qpsk1 1 2048
cable modulation-profile 222 a-short 6 76 6 22 64qam scrambler 152 no-diff 64 shortened qpsk1 1 2048
cable modulation-profile 222 a-long 8 231 0 22 64qam scrambler 152 no-diff 64 shortened qpsk1 1 2048
cable modulation-profile 222 a-ugs 8 231 0 22 64qam scrambler 152 no-diff 64 shortened qpsk1 1 2048
[cable interface]
cable tftp-enforce
no cable packet-cache
cable downstream annex A
cable downstream modulation 256qam
cable downstream frequency xxxxxxx
cable downstream channel-id 1
no cable downstream rf-shutdown
cable downstream rf-power 57
cable upstream 0 connector 4
cable upstream 0 frequency xxxxxxxx
cable upstream 0 docsis-mode atdma
cable upstream 0 channel-width 6400000 1600000
cable upstream 0 minislot-size 2
cable upstream 0 power-level 0
cable upstream 0 range-backoff 3 6
cable upstream 0 modulation-profile 222
cable upstream 0 equalization-coefficient
modem config:
Main
{
NetworkAccess 1;
BaselinePrivacy
{
AuthTimeout 10;
ReAuthTimeout 10;
AuthGraceTime 600;
OperTimeout 10;
ReKeyTimeout 10;
TEKGraceTime 600;
AuthRejectTimeout 60;
}
VendorSpecific
{
.
.
.
}
MaxCPE 5;
UsPacketClass
{
ClassifierRef 2;
ServiceFlowRef 2;
ActivationState 1;
IpPacketClassifier
{
DstPortStart 2727;
DstPortEnd 2727;
}
}
UsPacketClass
{
ClassifierRef 1;
ServiceFlowRef 2;
ActivationState 1;
LLCPacketClassifier
{
EtherType 0x030f16;
}
}
DsPacketClass
{
ClassifierRef 3;
ServiceFlowRef 4;
ActivationState 1;
IpPacketClassifier
{
IpProto 256;
DstPortStart 2427;
DstPortEnd 2427;
}
}
UsServiceFlow
{
UsServiceFlowRef 1;
QosParamSetType 7;
MaxRateSustained 10000000;
SchedulingType 2;
}
UsServiceFlow
{
UsServiceFlowRef 2;
QosParamSetType 7;
TrafficPriority 4;
SchedulingType 2;
}
DsServiceFlow
{
DsServiceFlowRef 3;
QosParamSetType 7;
MaxRateSustained 10000000;
}
DsServiceFlow
{
DsServiceFlowRef 4;
QosParamSetType 7;
TrafficPriority 4;
}
GlobalPrivacyEnable 1;
DocsisTwoEnable 1;
}
kind regards
Simon
You cannot go any higher than 2.7Mbps. There is an issue with the chipset, so it cannot transfere more than 2.7Mbps pr. session - even though you can go higher when transfering from multiple modems at the same time.
About the doc 2.0 flag: This is enabled by default, so you don't need to set this. You will only set it to 0, if you want to disable 2.0...
There are some issues with the TCM420 as well, but I'm pretty sure that is the case here. Let me know if you purchase another CMTS, and still can't get the US rate any higher...
successfull tested a bandwith of 6MBit+ in the US
with a lower time slot and channel bw of 6,4 Mhz
Hi simon,
can you tell me, how you able to upload more than of 2.7 mbps, i have configured same in my cm file but not able to reach more than of 2.7 mbps. how did you test 6 Mbps uload ?
show me your cmts and cm file configuration plz....
That's strange. Guess I have mixed the different Cisco CMTS names. Pardon for that. But since you have managed to get the 6Mbps, I might help you to get a bit more...
What do you mean about timeslot? Is that the same as minislotsize? In that case, have you tried with both 2 and 4 slots?
You can also try with some other settings in the configfile:
UsServiceFlow {
UsServiceFlowRef 2;
QosParamSetType 7;
MaxConcatenatedBurst 4566;
MaxTrafficBurst 4566;
}
Note the MaxConcatenatedBurst and MaxTrafficBurst. Try with 1522 * X values, and see what gives you the best result.
can you tell me, how you able to upload more than of 2.7 mbps, i have configured same in my cm file but not able to reach more than of 2.7 mbps. how did you test 6 Mbps uload ? it's upstream port of CMTS or upstream speed of modem ?
show me your cmts and cm file configuration plz....
Harindra.
Hi Simon,
don't get mixed up. The 2.7Mb is a very good result. This is the physical limmitation of Docsis.
OK Docsis 2.0 at qam64 equals 30Mb upstream theoretical, for the upstreamPORT. upstreamspeed of cablemodem is different of the upstreamport of your CMTS.
Try it, 5CM's at 2.7Mb =ok, 10CM's at2.7Mb = ok 20CM's at 2.7Mb = NOK
I have the same UBR, only i work with webstart modem's.
Hi Wodec,
That means we can't go more than 2.7 Mbps per modem ...is there any modem which is supporting more than 2.7 mpbs upstream.
How much you are getting in webstart modems?
But Simon is saying that he has tested 5.5 mbps behind cable modem ... how it's possible??
Hari.
Hi all,
I finally can get 6Mb US, here's how ...
On UBR you need the IOS 123-23.BC or above (i'm using BC4).
Use the global command "cable upstream rate-adapt".
Now i can reach 26Mb/6Mb on my CM(SB5121) using a-tdma 16QAM on the upstream.
Beware that you're likely to have problems if you have more than 100 CM per US
RAC
Hey Simon,
Did you ever this this problem fixed because im having the same issues right now :)
Hope you can post it on this forum, thanks
Martin
DK
What version of firmware do You have on TCM420? Maybe You have to upgrade it?
Sorry, we use only Motorola Surfboard 5101 modems in out setup, running :
SB5100E-2.3.1.8-SCM06-NOSH
Any one know if this software or even hw (chipset) has a "feature" of max US speed of 2-3mbit ?
Martin
DK
Hi,
How do we configure dynamic SA for a multicast goup address in BSR 64K
Thanks in Advance ..
regards,
wittmann
P.S. Sorry for my poor english ;)