[asterisk-users] question on show channels

[Jerry Geis]

when I do "core show channels" I see
Channel              Location             State   
Application(Data)            
DAHDI/i1/8125551212- s at default:1          Ring    
Wait(1)                      
DAHDI/i1/3175551212- s at default:10         Up      
BackGround(SM_ATTENDANT)     
2 active channels

what is the "i1"??  I thought this was the actual channel like 1 or 2 
etc... I am using asterisk 1.8.3
How do I show the actual channel in use?

Jerry