Description
- Packet Gateway expansion card for Definity Phone Systems
- 4 RS-423 physical ports
- DEF G3 TN577 Packet Gateway
TN577 Packet Gateway expansion card for AT&T/Avaya Definity Phone Systems. - Provides 4 RS-423 physical ports for X.25 protocol interfaces between the system and adjuncts - 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 - 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 - Supported adjuncts include Audix, CMS, and Message Server Adjunct (MSA) 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