[Asterisk-Users] PRI & BRI question

[firedude at shorelinuxsolutions.com]

Greetings all,
As most of you probably know from my previous questions on the list, I'm 
still in the newbie category.  My question today is pretty brief, as I 
told you all a few weeks ago I ordered a PRI from Verizon.  I understand 
that there is a "B" channel that comes with this.  The question is just 
what can I use this "B" channel for and how??? 
Thanks
AJ