- The
TN577 packet gateway (PGATE) provides 4 RS-423 physical ports
for X.25 protocol interfaces between the system and adjuncts.
- In
this application, PGATE 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
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).
- The
TN577 also 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
the appropriate DS1 or tie trunk circuit pack.
|
