5-20ms[1], if the DSL is set to Fast path (not Interleaved). The reason is simply because DOCSIS is working on a shared medium so in certain cases you have to

5-20ms[1], if the DSL is set to Fast path (not Interleaved). The reason is simply because DOCSIS is working on a shared medium so in certain cases you have to wait for others to stop transmitting on your channel so you can transmit + there are much more unpredictable errors due to RF noise caused by having a lot of devices share a "single cable" (it's not REALLY single cable, it's split, but all noise will end up on the one feed to the CMTS) and also it's quite easy to get noise from neighbors. Noise is often hard to solve (find the source of it), i.e. it's a household with a bad set top box power supply sending low voltage AC into the cable network. Problems can be solved, and in some cities DOCSIS works very well, but often times it doesn't, and when it doesn't it's really difficult to fix it other than doing a node split (i.e. adding a new CMTS and moving half of the users to it) and proactively putting filters in everyone's house and controlling installations. [1] more on DOCSIS compared to DSL