I can't read my data into JETDSP

First rule out simple errors: for example

The signal reading dialog remembers its setting between invocations. This means that, if, for example, the last JPF you read was offline, then it will be set to read offline JPFs next time round.
Remember that the pulse number is shared between different panels on the Signal reading dialog
Check, if possible, whether the data exists. The PPF system allows you to do this using the online utilities.

Often data-reading problems are due to a limitation of the system that JETDSP is using to get the data. Note that:

JETDSP is a single-threaded application. This means that if the underlying data server hangs, then so will JETDSP
If you are reading data for an old shot, you might have to wait for it to be recalled from tape.
PPFs are normally read through the IDLPPF interface. If a PPF can be read into IDL using PPFREAD but not JETDSP, then JETDSP is at fault. If PPFREAD direct into IDL does not work, then IDLPPF or the PPF system is at fault. In either case contact us at the email address below.