| Attachment | Size |
|---|---|
 Config file | 57.17 KB |
Hello,
I am new here, so I hope someone can help me. We upgrade recently our Cisco UBR7246VXR to a Cisco UBR10012 with two card 20x20 and 5 card 5x20. We are planning on only use the 20x20 for now. We configure and migrate all our nodes without issues, all our clients have have cable modem 2.0, so no problem while migrating. But now the issue is that we are testing cable modem 3.0 and they are taking the upstream wideband in partial mode. When we check the cable modem 3.0 interface, it only show one upstream and the other one is still down and ranging. We are trying to make 4x2 configuration, 4 downstream and 2 upstream.
I am guessing the reason for this is that the CM isn't finding at physical level the second connection to the card port, but I am not sure. Can that be the issue? Do I have to physically combine the nodes with a splitter from the optical receptor to the line cards upstream?
Any help I would appreciate it.
Please share your config file. It can be config problems too.
Is the MTC mode enabled?
Yes, I have MTC mode enable, I add the config file in my previous post and here too
It is strange when you use US channels in different connectors for bonding.
It can work when you add them with a splitter, but easier way when use frequencies from the same bonding in a same connector.
Like upstream 0 and upstream 1 are on connector 0 and upstream 2 and upstream 3 in connector 1.
Or you can put all of the four upstream on the same connector.
If I do that, then it means I have to physically connect the outputs from the optical receptor to the same connector throught a splitter?
Is this possible only on 20x20 or on 5x20 too?
Based on your config, you should have return path wiring like this :
* node1 ---> receiver1 ---> 4 way coax splitter -> CMTS 5/1 connector 0,1,2,3
* node2 ---> receiver2 ---> 4 way coax splitter -> CMTS 5/1 connector 4,5,6,7
* node3 ---> receiver3 ---> 4 way coax splitter -> CMTS 5/1 connector 8,9,10,11
* node4 ---> receiver4 ---> 4 way coax splitter -> CMTS 5/1 connector 12,13,14,15
* node5 ---> receiver5 ---> 4 way coax splitter -> CMTS 5/1 connector 16,17,18,19
As another poster said, you can alter the config to stack 2 x US CH per connector which allows for simpler wiring eg
* node1 ---> receiver1 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 0,2
* node2 ---> receiver2 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 4,6
* node3 ---> receiver3 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 8,10
* node4 ---> receiver4 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 12,14
* node5 ---> receiver5 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 16,18
Other tips for return :
* Since you don't have any DOCSIS 1.1 modems, you should change your config from "tdma-atdma" to "atdma"
I am a bit worried about your forward path too, the config doesn't look optimal to me...
If you get it wrong it can result in new modems taking a very long time to first come online.
Which way have you wired it? :
OPTION 1:
* node 1 <--- transmitter1 <--- CMTS 5/1 DS connector 0
* node 2 <--- transmitter2 <--- CMTS 5/1 DS connector 1
* node 3 <--- transmitter3 <--- CMTS 5/1 DS connector 2
* node 4 <--- transmitter4 <--- CMTS 5/1 DS connector 3
* node 5 <--- transmitter5 <--- CMTS 5/1 DS connector 4
OPTION 2:
* node 1 <--- transmitter1 <--- 8 way coax splitter <--- 8 way coax combiner <--- CMTS 5/1 DS connector 0,1,2,3,4
* node 2 <--- transmitter2 <---
* node 3 <--- transmitter3 <---
* node 4 <--- transmitter4 <---
* node 5 <--- transmitter5 <---
OPTION 3:
* node 1 <--- 8 way optic splitter <---- transmitter1 <--- 8 way coax combiner <--- CMTS 5/1 DS connector 0,1,2,3,4
* node 2 <---
* node 3 <---
* node 4 <---
* node 5 <---
Or some other variation ?
First, thanks for tip, I will change tommorow the return to "atdma"
I think I understand the US bonding more now. In my case, I have 20 nodes with
Internet service, if I intend to configure 4 DS and 2 US, then I have implement the second option you mention.
But I will need to use my two line cards 20x20 and the cables in odd connectors:
1,3,5...15,17 would be left in the air or disable.
Or if I could try this combination:
* node1 & node2 ---> receiver1 & receiver2 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 0
* node3 & node4 ---> receiver3 & receiver4 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 2
* node5 & node6 ---> receiver5 & receiver6 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 4
* node7 & node8 ---> receiver7 & receiver8 ---> 2 or 4 way coax splitter -> CMTS 5/1 connector 6
* etc etc
Thanks for the worry on the forward path and you are right, the CMs take some time to get online and more now
that I have more downstream frequencies available.
I have it wired like option 3 with some variations.
Instead of a 8 way coax combiner, I use 24 way coax combiner. Also a lot of variation, since I need to combine it in a 3 way coax splitter with Digital TV,
then an amplifier, a set of taps to feed the transmitters and 2, 4, 8 way optic splitter to the nodes.
OPTION 3 with variations:
* node 1, 2, 3... N node <--- (2, 4, 8) way optic splitter <---- transmitters1 <--- Set of Taps <--- Coax Amplifier <--- 3 way Coax Splitter <--- 24 way coax combiner <--- CMTS 5/1 DS connector 0,1,2,3,4 To the 3 way coax splitter too <--- 12 way coax combiner <--- Digital TV
I hope my explanation can be understood and I should improve the downstream connections, so the CMs can get online the first time more quickly.