buy new pix firewall with DMZ port for 500 connection unrestrict

i want to buy new pix firewall with DMZ port for 500 connection unrestrict
did pix 525 have dmz port or must i add to it when buy it
can anyone help me
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nasemabdullaaAuthor Commented:
now i have pix 515 but with no dmz port can i add one to it or not
and how many connection (user) can this firewall work with it

You can add a an additional port to the 515 that you already have, but you can only have a maximum of 3 physical interfaces with the restricted license.  It supports 48,000 maximum connections with the restricted license, and 130,000 maximum connections with the unrestricted license.  You should only need the restricted license since that will also allow you to add the 3rd interface for a DMZ and supports 48,000 max connections.
Also, see the following for a model comparison of the PIX firewall series:

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