First Round Schedule

Game 1: Friday, April 21st 7:00 PM Tampa Bay at Ottawa CBC
Game 2: Sunday, April 23rd 6:00 PM Tampa Bay at Ottawa CBC, OLN
Game 3: Tuesday, April 25th 7:00 PM Ottawa at Tampa Bay OLN, CBC
Game 4: Thursday, April 27th 7:00 PM Ottawa at Tampa Bay OLN, CBC
Game 5: Saturday, April 29th 7:00 PM Tampa Bay at Ottawa CBC, OLN
(if necessary)
Game 6: Monday, May 1st 7:00 PM Ottawa at Tampa Bay OLN, CBC
(if necessary)
Game 7: Wednesday, May 3rd 7:00 PM Tampa Bay at Ottawa CBC
(if necessary)

That's from TBO. I would assume that any games not televised nationally will be picked up by Sun Sports TV. Stay Tuned.

UPDATE: Sun Sports will be broadcasting all games. Per their web site:

IMPORTANT LISTINGS NOTE: Any OLN coverage in the first round, per NHL requirements, will be blacked out in Tampa/St. Petersburg and surrounding areas for all Lightning games televised by Sun Sports.

There will be extensive pre and post game coverage as well.