Each CMTS may have one or many Line Card, in these card, it can have multiple US and DS interfaces. these interface are connected to FiberNode via fiber cable, and then using coxial it send to CM. I can see that only one interface (either US/DS) from CMTS can be connected to Fibernode, then how does the CM uses the same interface for sending both US and DS signal.
How the US/DS interface of CMTS get associated with fibernode ?
More accurately it has multiple controllers - Cable interfaces, which you configure, are not physical interfaces. You connect physical ports (both upstream and downstream) to the fiber node via HFC infrastructure. And you specify which US and DS are associated with each physical fiber node in the fiber-node configuration on the CMTS.
Also, can you explain what you mean by "I can see that only one interface (either US/DS) from CMTS can be connected to Fibernode"?
One downstream(s) can feed multiple fiber nodes and upstream ports. depending on the cmts used, you would create a fiber node like FN1. within FN1 you would have downstream from one or more ports that are associated with one or multiple upstream ports.
docsis 2.0 days the one downstream would feed 6 nodes for example. the return from those 6 nodes would get combined to feed one or two receivers.
docsis 3.0 would have 8 downstream channels to feed one or two upstream ports and each port can support up to 6 frequencies with different channel widths.
Hope this helps
Carl
I would like to know about the wiring diagram between CMTS and Cable modem.
Please give me the complete guide