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Issue 7 May 1998 13-1
13
ASAI-Ethernet
Overview
A new transport option, CallVisor ASAI over the DEFINITY LAN Gateway, is
available in DEFINITY starting with G3V4
,
and in DEFINITY G3V2/G3V3 with a
field maintenance upgrade. In G3V4, this option incorporates a system assembly
that uses a Multi-Function Board (MFB), a DEFINITY LAN Gateway circuit pack
that supports an Ethernet controller, and a software environment. Starting with
Release 5, this option incorporates a system assembly that uses a
Multi-Application Platform for DEFINITY (MAPD), which supports an Ethernet
controller and a software environment. The software environment, in turn,
supports the DEFINITY LAN Gateway application that serves as an ISDN brouter
of ASAI messages through a TCP “tunnel” via 10Base-T Ethernet.
1
While CallVisor ASAI over the DEFINITY LAN Gateway supports the same Q.931
messages used for ASAI-BRI, it replaces the ISDN BRI transport layers below
layer three with a simple TCP protocol described in the
DEFINITY Enterprise
Communications Server CallVisor ASAI Protocol Reference
, 555-230-221.
Physical Connectivity for MFB
The MFB system assembly that provides the DEFINITY LAN Gateway brouter
application is a pair of circuit packs [a Multi-Function Board (TN2208)], an
Ethernet Alarm Board (TN2170), and a spacer, that provide a processor, a hard
disk, a tape unit, an Ethernet, and serial ports. See Figure 13-1.
1. In local area networking, a brouter is a device that combines the dynamic routing capability of an
internetwork router with the ability of a bridge to interconnect dissimilar local area networks
(LANs). It has the ability to route one or more protocols and bridge all other traffic. The DEFINITY
LAN Gateway application links ISDN and TCP/IP at both a physical and addressing level.