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ASCII Hosts
ASCII Devices
In addition to or instead of having one or two SNA host connections, the 3708 can
have up to nine ASCII host connections. A terminal that selects an ASCII host has
exclusive use of the host line until disconnected. This prevents more than one
terminal from using a single ASCII host line simultaneously. However, if multiple
concurrent sessions are required for an ASCII host, multiple lines to the ASCII host
may be defined. When the user logs on, connection to the ASCII host is permitted if
a line to the host is available.
An ASCII host may be a personal computer, a printer, or any other ASCII device.
Attachment to an ASCII host is point-to-point, and can
be
either direct or remote
over a switched or nonswitched (leased) line. Line speeds up to and including 19.2
Kbps can be used. When an ASCII device and an ASCII host are communicating
through a 3708, the line speeds of the line to the device and the line to the host
should be such that the transmission over the slower of the two lines is less than 979
characters behind the transmission over the faster line, or data may be lost. See
Chapter 6, "ASCII Pass-Through Mode."
When an ASCII device and an ASCII host are communicating through the 3708, the
3708 transmits data unchanged and unchecked between the device and the host.
Dial out is allowed to an ASCII host. See "Dial Out" on page 6-4.
ASCII devices that can be attached to the 3708 include displays, printers, and
keyboard printers. ASCII devices may be directly attached up to 50 feet with the
EIA 232C interface or, for distances up to 4000 feet, with the direct-attach interface
using EIA 422A signaling. They also may be remotely attached over switched or
nonswitched lines.
Displays, printers, and keyboard printers can also be attached to the 3708 for
operation in protocol conversion mode.
1-16
IBM 3708
Description
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