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ASAI-Ethernet
13-10 Issue 7 May 1998
Figure 13-6. Relationship of Virtual BRI Ports, Brouter, and DEFINITY LAN Gateway
Clients
Due to the point-to-point nature of ASAI, the brouter uses an administered table to
determine the valid clients for CallVisor ASAI over the DEFINITY LAN Gateway
application. Each table entry provides a dedicated association between a client
and a virtual BRI port. By using multiple table entries with different values for the
client link, it is possible to provide a single client access to multiple virtual BRI
ports. The DEFINITY LAN Gateway software represents itself to DEFINITY ECS
as a BRI circuit pack. This means that DEFINITY ECS administration will continue
to allow “ASAI” terminals to be assigned to BRI ports. The BRI ports may be
actual, as they are with ASAI-BRI, or virtual, as they are using the DEFINITY LAN
Gateway application. If a BRI port is provided using the BRI circuit pack (TN556),
then the BRI ports are actual. If a BRI port is provided using the DEFINITY LAN
Gateway system assembly on the MFB, (TN2208 and TN2170), or (TN801) on the
MAPD, then the BRI ports are virtual and tunneled over Ethernet TCP/IP.
Once a virtual BRI port is assigned in the brouter application, all its ASAI
messages are sent to the administered client, if it is connected. The brouter also
passes ASAI messages from DEFINITY LAN Gateway clients to the virtual BRI
port and then to DEFINITY ECS.
To pass messages, the brouter references the table of virtual BRI ports, client host
names, and link numbers. A maximum of 8 such connections or mappings can
exist simultaneously (only 4 are useful in a DEFINITY G3s and DEFINITY ECS
R5s
2
). Each entry in the table has the following form:
Client 2
1 link
2 links
Client 1
10Base-T Ethernet
Table-Driven BRouter
(up to 8 entries)
Port 1
Client 1 Link 1
Port 2
Client 1 Link 2
Port 12
Client 2 Link 1
Virtual
BRI Port 12
Virtual
BRI Port 2
Virtual
BRI Port 1
D
E
F
I
N
I
T
Y
B
a
c
k
p
l
a
n
e
MFB/MAPD Circuit Pack