I have no where else to ask this question.

Is TSQL the same as CTCSS?

The reason I am so intrigued is about this is

The other day my UV-5R was in scan mode and a repeater in Huntsville continually stopped my scan with a carrier or tone, not sure which yet. But I heard no audio. No matter where I set the squelch, even to 0 I got no audio. However, if I hit the Moni button I could hear the guys talking.

What was happening here?

Thanks in advance. 

In 3 weeks I'll be W9BOQ if the FCC grants my vanity call sign.

Whiskey Niner Bravo Oscar Quebec.