Overview of the MAPD
1-6 Issue 3 May 2002
DLG Software
The software that provides the DEFINITY LAN Gateway application on the system
assembly comes preloaded on the system when it is shipped from the factory.
The function of the software is to act as a mapper (or Brouter) for ASAI messages.
It links an ISDN network (the DEFINITY system call control) to a TCP/IP network
(computer client) by moving ASAI messages back and forth from Q.921
synchronous data frames to TCP/IP Ethernet packets. It also associates computer
clients (by their TCP/IP network addresses) to physical ports on the DEFINITY
systems that are administered as ASAI extensions.
This mapping provides a virtual point-to-point connection between a particular
computer client and an associated port on the DEFINITY system. This
arrangement continues to support ASAI ability to sense when a a particular
computer client connection is lost and to send an alarm. It also provides a more
secure environment by fixing the addresses of the clients that may receive this
service.
Figure 1-2. MAPD System in the DEFINITY System
Modem
HUB
10Base-T
RS232-A
RS232-B/C
Terminal or Emulator
CTI Application
DEFINITY system G3R with MAPD
Computer
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