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General Information
1-4. Features
Important features of the INP are:
•
Hardware data transfer rates to 56,000 bits per second.
•
32K bytes of random
support
program
access
storage
memory
(RAM)
for
and
for
character
driver
and
and
message
buffering.
•
BK bytes of read-only memory (ROM) •
•
Protocol
and
link
intervention.
processing
without
computer
•
High-speed, silicon-on-sapphire (SOS) microprocessor.
system
•
Compatible
with
IBM
Binary
protocol •
Synchronous
Communications
•
EIA
RS232C,
and
CCITT
V.24
and
V.35
compatibility.
•
Full- or half-duplex operation.
•
Compatible with HP 37210T, HP 37220T, and HP 37230A modems and
with Bell 201C, 208, and 209 moderns.
•
Direct-connect capability between two HP 3000, or HP 3000 to
HP 1000 computers.
•
Retention of buffered data during power fail/restore periods.
•
Stand-alone, user-initiated, self-test capability.
•
Auto Call Interface which allows automatic
dial-up
of
phone
lines.
HP
supports
the Racal Vadic VA811 auto call unit
used with the HP 37210T modem, and the
Bell
801C
auto
call
unit used with the Bell 201C or 208B modems.
1-5. Interface to System
The HP 30020B INP has one PCA board that is backplane
compatible
with
the HP 3000 HP-IB Version Computer Systems.
The INP PCA is
installed in the "device" section of the I/O card cage.
The
INP
communicates with the General I/O Channel (GIC) via connector J3,
and with the modem via connectors Jl and J2.
(See figure
1-3.)
The
INP receives power from the system via connectors P2 and P4.
Connector Pl is used for test signals, and connector
P3
is
not
currently used.
1-8
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Table of Contents
Troubleshooting
