The Definity TN577 Packet Gateway provides 4 RS-423 physical ports for X.25 protocol interfaces between the system and adjuncts.

The Definity TN577 Packet Gateway functions as the data communications interface unit providing protocol conversion between the X.25 protocol and the mode 3 protocol carried across the LAN bus.

The Definity TN577 Packet Gateway has X.25 protocol (Levels 1 and 2) is terminated and the data reformatted into the ISDN packet mode protocol for transport across the LAN bus.

The Definity TN577 Packet Gateway supports adjunct which includes Audix, CMS, and Message Server Adjunct (MSA) and supports the Distributed Communications System (DCS) environment by providing X.25 signaling through 1 of the RS-423 physical ports, or back through the system using the TDM Bus to appropriate DS1 or tie trunk circuit pack.

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