Configuring an ADTRAN 4305 with a P2P

I am trying to configure my Adtran 4305 for a new P2P line.  I selected T1 3/8 port and want to assign the internal IP address as to the port PPP4.  When I give it a subnet mask of I get an error
Error: Bad mask for address  

I have other t1's configured with different IP addresses on Ports T1 3/1-3/6 but the only differences is they are two bound together.

Any suggestions would be appreciated.

Thank you.
Nancy VillaDirector of ITAsked:
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rpawlyConnect With a Mentor Commented:
The problem you are having is with the IP you are using. is a broadcast address of the network  If you want to use this network, you will need to use either or as your IP.

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