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1
Description
General Information
This
manual describes the the HP 27140A Asynchronous 6-Channel Multi- .
plexer (MUX) Interface. We use the terms "multiplexer", "MUX", "HP
27140A", and its full name interchangeably to describe the entire product.
The terms "board", "card" and "PCA" designate the printed circuit assemb-
ly as distinct from the entire product.
The HP 27140A accesses any of the computers using the Hewlett-Packard
Channel Input/Output backplane standard. (Channel 110 is a Hewlett-
Packard standard derming the electrical and physical characteristics for
an Input/Output system.) The multiplexer supports RS-232-C and CCITT
V.24 and V.28 communications standards.
The factory setting for the information transmission rate is 9600 baud.
The MUX is also programmable to process rates from 50 to 19200 baud.
See Chapter 2, "Installation and Configuration", for the information
needed to use the six communications ports.
This
multiplexer provides for Input and Output (110) through multiple
modems from remote locations via telephone lines.
This
product has the
appropriate control lines for connection to any modem which adheres to
RS-232-C or CCITT V.24 and V.28. There are no modems included with
this
multiplexer . The MUX also communicates with local, direct-connect
devices, and supports any
mix
of six peripherals while using only one card
slot in the computer backplane.
Your local telephone company or your long distance carrier
will be
able to
install conditioned telephone lines if your modems or applications require
them.
General Information 1-1
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