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> If multiple ports connected in each CMTS are not allocated per cable
> but can handle multiple cables according to demand, the above
> argument is not true.
In HFC system, one node which is one cable line in head end
accommodates the home pass of 1000 to 2000 as you say.
※ HFC: Hyblid Fiber Coaxial
According to demand over their service, operators mix and connect two
or more cables in one CMTS port as your imaging.
US: up stream
DS: down stream
CMTS line card
1 node US-----+ +---------+
2 node US ----+ | |
3 node US ----+->---->-+ US port |
4 node US ----+ | |
| |
1 node DS-----+ | |
2 node DS ----+-<----<-+ DS port |
3 node DS ----+ | |
4 node DS ----+ +---------+
Some line cards have the port of a different number of DS and US.
If it mixes, a noise level will go up relatively. Since US is more
sensitive than DS to noise in many cases, there are more US than DS.
CMTS line card
+---------+
1 node US------->---->-+ US port |
2 node US ------>---->-+ US port |
3 node US ------>---->-+ US port |
4 node US ------>---->-+ US port |
| |
1 node DS-----+ | |
2 node DS ----+-<----<-+ DS port |
3 node DS ----+ | |
4 node DS ----+ +---------+
Regards,
-- ashida
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