They turn these radio symbols into the ones and zeros familiar to computers everywhere, then pass them along to JPL via the communications system. If you've ever set up a modem and configured your computer to talk to a data service, you know that data communications are not always one hundred percent easy and reliable. Configurations can be set incorrectly. Circuits can overload. Severe weather, as well as solar flares, can interfere.
Land lines can fail.
Once received at JPL, there are more telemetry system components that process the data. There's an interface with the communications link. Then, there's the storage and distribution of the data. Glitches can occur in these systems, too. When all goes well, the data are seen at the users' workstations, and are stored and archived for future reference.