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.___G_E_N_ER_A_L _IN_FD_R_M_A_T_ID_N _ _ _
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1-1. INTRODUCTION
This section describes the
functional
and
physical
character-
istics
of
the
HP
300208
Intelligent
Network Processor (INP)
shown in figure 1-1.
Related publications that may
be
required
for
operation
and service of the !NP are listed in the Preface.
In this manual, the HP 3000 HP-18 Version Computer Systems refers
to the HP 3000 Series 30,33,40,44 and 64 Computer Systems.
1-2. GENERAL DESCRIPTION
The HP
300208
Intelligent
Network
Processor
(frequently
re-
ferred
to
hereafter as the !NP) provides the HP 3000 HP-!8 ver-
sion Computer Systems with
data
communication
capabilities
in
high-speed as well as low-speed modem environments.
A microprocessor within the INP performs the communications
pro-
tocol
management,
thus
relieving the HP 3000 processor of that
task.
As power is applied, the INP initializes
itself,
runs
a
mini-diagnostic
routine,
reports to the system that it is func-
tionally
operational,
and
requests
configuration
parameters.
When
a
request
for data communication performance is made (for
example, when a user at a terminal opens a DS line),
the
system
loads
the
appropriate driver onto the INP.
The INP then trans-
fers control to the driver from its
background
loader
program.
The
driver
opens the communications channel and passes buffered
data back
and
forth
between
the
HP 3000
CPU
and
the
data
communication channel.
Serialization, protocol management, frame/block management, modern
management, and data buffering are all performed by the INP.
The
CPU must still process message formats and higher level link pro-
cedures.
While
the
INP
is
transferring
the
last
correctly
received block of data to the CPU, the INP is also processing and
buffering the next block of data corning
from
the
communication
channel.
1-1
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