16/4Mbps Token-Ring Network Gateway feature
The gateway feature provides
for
data passage between an SNA/SDLC host
processor and workstations and
controllers
that are attached to the IBM
Token-Ring Network. The gateway feature
will
operate on an IBM Token-Ring
Network at
either
16
or
4Mbps.
The feature can be
installed in any of the
following
controllers: 1
L,
11
L,
1
R,
11
R,
2R,
12R,
51
R,
61
R,
52R, and 62R. The gateway feature does not
interfere
with the
ability
of ring-attached devices to communicate with each
other
on the ring;
nor
does
it
affect
terminals
directly
attached to the gateway 3174.
Many workstations can be defined to the host VTAM because of the gateway
feature. Depending upon the configuration and
controller
models involved,
it
is
possible that up to
250
Token-Ring-attached workstations
or
controllers
can be
defined to VTAM. The addresses
are
mapped to unique host subchannel
or
SDLC
addresses. One subchannel
or
SDLC address is also required
for
the
controller
in
which the gateway feature is
installed~
DD
Host
3174
MOdel.53R~
I ,
A
..•.
•
•...
:.D
.•..•...
J
dl-_--l
Token-Ring
O"'~:'~\~/
,
....
,
..
;
'>------r'
3174
Model
IL
with
Gateway
Feature
3174
Model
53R
3174
Model3R
Figure
2-2. IBM Token-Ring
Network
Host-Gateway
Relationship
Adding the gateway feature to the system requires no changes in the host
application program. Nor is
there
any effect upon normal 3174 Establishment
Controller
functions.
Chapter
2.
Features and Functions
of
the
3174
Controller
2-7
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