Why do we need to assign ip address to the D channel (signaling ) when we configure ISDN-PRI in the example below :
http://www.cisco.com/univercd/cc/td/doc/product/access/ap/ap_ts3/ap_ts3sw/apswisd.htm
<quote>
Step 1:Specify the D channel of the first Primary Rate Interface (PRI):
AS01(config)# interface Serial 0:23
AS01(config-if)#
Step 2: Assign an IP address and subnet mask to the interface:
AS01(config-if)# ip address 172.16.254.253
</quote>
Regards