Driving with no licence carries a fine, but you should not be facing any jail time. If you were driving under suspension, there is the possibility of jail time, especially if you have prior convictions.
In my experience, the Crown usually doesn't seek jail time unless it's someone's third or more conviction for driving while suspended. It also depends on your overall driving record and outstanding fines.
Driving under suspension is a relatively serious HTA charge. Unless you are experience with the Court system, I'd suggest consulting with a paralegal if you're concerned about the outcome.
The charge of driving with no licence means you've either never had one, it's expired/not active or it's for the wrong class of vehicle (i.e. driving a motorcycle with only a G licence). Driving while under suspension means that the Government has actually told you you're prohibited from driving completely, usually as a result of another offence, and therefor considered more serious.
If you were actually suspended at the time the officer stopped you, the correct charge would have been driving while under suspension. I'm not sure why the officer would have charged you with the lesser offence, especially if he gave you a summons. If your charge does end up going to trial, the Crown may seek to withdraw your original charge and lay a new one for Driving Under Suspension.