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3708 Sessions
This section describes the LUs that can be associated with 3708 ports and describes
how the LUs are defined.
3708 Session Components
Each downstream port on the 3708 can have up to three LUs associated with
it.
See
3-2 for an example.
LU#1
Display
SNA Host A
PU#1
-- --
--
--
SNA Host B
PU #2
" "
" "
--
"-
---
"
2
--~
~
____________ - L ____________
~
LU#2
LU#3
Display
Printer
-
-
-
Indicates that LU
#
3 can go to either host, but
not
both.
Figure 3-2. Maximum Number of LUs Associated with each 3708 Downstream Port
3
The LU
#1
is used for communication with SNA host A and is associated with the
3708 PU defined for SNA host A. The LU #2 is used for communication with SNA
host B and is associated with the 3708 PU defined for SNA host B. The LU #3 is
used for printer communication when the downstream device has been defined to the
3708 for MLU support (keyboard/display with printer). It is associated at
configuration time either with host A or host B, but not both.
All three of these LUs may be activated at the same time; however, only two (one
display and one printer) may be bound (that is, in communication with a host
application). Downstream devices can be bound to either SNA host A or SNA host
B but not both at the same time. The LU associated with the MLU printer can be
bound to either host A or host B. Although, in an MLU configuration, the printer's
LV does not become bound unless its associated display is bound as an LV type 2.
The MLU printer is not required to be bound to the same SNA host as its
associated display.
With two SNA hosts defined, the 3708 can support up to 24 active LUs with as
many as 16 of those LUs bound and in communication with host applications. With
one SNA host defined, the 3708 can support as many as 18 active LUs with all 18
LUs capable of being bound and in session with host applications.
Chapter 3. SDLC and SNA Communication
3-13
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