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Figure 1-1. 3708 Network Conversion Unit
Operating Modes
Cartridge
Light
'-----Base
Power On/Off
Light
Not Ready
Light
The
3708
provides three modes of operation, which it can perform simultaneously,
for different network configurations:
• 3270 applications running on an SNA host. The 3708 provides protocol conversion
mode for communication between an ASCII end-user device and
3270
applications running on an SNA host. This mode changes a start-stop data
stream from an ASCII device into a
3270
data stream and provides
3274
Control
Unit functions, including
3270
full-screen support.
• Line-by-line applications running on an SNA host. The 3708 provides protocol
enveloping mode for communication between an ASCII end-user device and line
oriented applications running on an SNA host. In this mode, the
3708
surrounds the data stream from an ASCII device with SNA headers. Devices
that normally communicate with host applications through the start-stop support
of the Network Terminal Option (NTO) can communicate through the
3708.
NTO start-stop support is not required for
3708
operations and can be
eliminated from the communication controller.
• Applications running on an ASCII host. The 3708 provides ASCII pass-through
mode for communication between an ASCII display and applications running on
an ASCII host. This mode passes a start-stop data stream between an ASCII
display and an ASCII host without changing the data stream in any way.
Network Configurations
The
3708
provides
10
communication ports that can be defined for various
configurations of SNA hosts, ASCII hosts, and AscII end-user devices. The host
may be directly attached or may be remotely attached over nonswitched (leased)
lines. ASCII devices may be directly attached or may be. remotely attached over
switched or nonswitched lines. Line speeds of up to
19200
bps can be used.
1-2
3708 Planning and Installation
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