Cisco CISCO776 Installation Guide - Page 76
Electronic Point of Sale, Port Address Translation
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Definition of Terms and Acronyms Directory numbers The equivalent of telephone numbers. This is the number the router dials to connect to a remote router. ISDN BRI lines are generally assigned two local directory numbers, one for each B channel. EPOS Electronic Point of Sale IE Information Element of a Q.931 message Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) A digital communication medium that operates over existing analog telephone lines. The BRI provides two 64-kbps B channels (for voice and data) and one 16-kbps D channel (for customer and call information). This channel combination is sometimes denoted as 2B+D. Internet Protocol (IP) address A network address that uniquely identifies a device on an IP network. This type of address consists of 4 bytes, represented as decimal values, separated by periods, as in 123.45.67.89. Media Access Control (MAC) address Also known as a hardware address. This address is assigned by the device manufacturer, for example, 1234.5678.9000. Point-to-Point Protocol (PPP) A direct connection between two nodes; a connection without any intervening nodes or switches. In an internetwork, the term refers to a direct connection between two networks. Password Authentication Protocol (PAP) A form of PPP authentication that requires an exchange of user names and clear-text passwords between two devices. PAP passwords are sent unencrypted. Both devices must support PPP. PAT Port Address Translation 6-2 Cisco 700 Series Router Installation Guide