asterisk users - Oct 2003 - Is there always data at /dev/zap/1?

Hey all..in trying to futher troubleshoot my caller id problem I'm 
looking at some past troubleshooting tips and this struck me as strange:

If I cat /dev/zap/1 I *always* see data...no matter if the line is in 
use or not...is that typical? Just curious...

Thanks,
Chris

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