HP 30242 Manual

HP 3000 Computer Systems
UP 30242 LAN/3000 Link
Local Area Network Interface Controller
(LANIC)
Installation and Service
Manual
r,;;. HEWLETT
a:~ PACKARD
HEWLETT-PACKARD COMPANY
Roseville Networks Division
8000 Foothills Boulevard
Roseville, California
95678
Update 1 (Jul~T 1986)
Manual Part No. 30242-90001
E0285
Printed in U.S.A
February
1985

11
NOTICE
The information contained in this document is subject to change without notice.
HEWLETT-PACKARD MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS
MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall
not be liable for errors contained herein or for incidental or consequential damages in connection
with the furnishing, performance or use of this material.
This document contains proprietary information which is protected by copyright. All rights are
reserved. No part of this document may be photocopied, reproduced or translated to another
language without the prior written consent of Hewlett-Packard Company.
Copyright © 1985, 1986 by HEWLETT-PACKARD COMPANY

PRINTING HISTORY
The Printing History below identifies the Edition of this Manual and any Updates that are included.
PeriodicallY,
update packages are distributed which contain replacement pages to be merged into the
manual, including an updated copy of this Printing History page. Also, the update may contain write-in
instructions.
Each reprinting of this manual will incorporate all past updates; however, no new information will be
added. Thus,
the reprinted copy will be identical in content to prior printings of the same edition with
the user-inserted update info~mation. New editions of this manual will contain new information, as well
as updates.
30242-90001
First Edition
Update 1
February 1985
... July 1986
111

SAFETY CONSIDERATIONS ]
SAFETY SYMBOLS
Instruction manual symbol: the product
will be
marked with this symbol when it is
necessary for
the user to refer to the
instruction manual in order to protect the
product against damage.
GENERAL -This product
documentation must be
familiarization
with safety
instructions before operation.
and related
reviewed
for
markings and
r CAUTION I The CAUTION sign
denotes ahazard.
It calls
attention to an operating
procedure, practice,
or the
like, which, if not correctly
performed or adhered to,
could result in damage to or
destruction of
part or all of
the product. Do not proceed
beyond aCAUTION sign
until
the indica ted condibons are
fully understood and met.
I CAUTION]
ST A TIC SENSITIVE DEVICES
WARNING,
Indicates hazardous voltages.
Indicates
earth (ground) terminal
(sometimes used in manual to indicate
circuit common connected to grounded
chassis).
The WARNING sign
denotes a
hazard. It calls
attention to aprocedure,
practice,
or the like, which, if
not correctly performed or
adhered to, could result in
injury. Do not proceed
beyond a
",7 ARNING sign
until the indicated conditions
are fully understood and Inet.
When
any two materials make contact,
their surfaces are crushed
on the atomic
level
and electrons pass back and forth
between the objects. On separation, one
surface comes away
with excess electrons
(negatively charged) while the
other is
electron deficient (positively charged). The
level
of charge that is developed depends on
the type
of material. Insulators can easily
build
up charges in excess of 20,000 volts.
Aperson working at abench or walking
across afloor
can build up acharge of
many thousands
of volts. The amount of
static voltage developed depends on the
rate of generation of the charge and the
capacitance of the body holding the charge.
If
the discharge happens to go through a
semiconductor device
and the transient
current pulse is not effectively diverted by
protection circuitry,
the resulting current
flow through the device can raise the
temperature of internal junctions to their
melting points. MOS structures are also
susceptible to dielectric damage due
to high
fields.
Feb 85
v

Feb 85
vi
The resulting damage can range from
complete destruction to latent degradation.
Small geometry semiconductor devices are
especially susceptible to damage by static
discharge.
The LANIC card is shipped in a
transparent static shielding bag. The card
should be kept in this bag at all times until
it is installed in the system. Save this bag
for storing or transporting the card. When
installing
the card in the system, do not
touch any components. Hold the card by
its edges.
WAR,NING
SAFETY EARTH GROUND - The
computer on which this product is installed
is a
safety class Iproduct and is provided
with a protective earthing terminal. An
uninterruptible safety ground must be
provided f
rom the main source to the
product input wiring terminals, power cord,
or supplied power cord set. Whenever it is
likely that the protection has been
impaired,
or before the power cord is
removed from the wall receptacle, the AUI
cable connector
must be removed from the
junction panel and insulated from exposed
conductive surfaces.
WARNING
At infrequent intervals, exposed metal
surfaces of the AUI cable may be subject
to transient hazardous voltages due to·
strong electrical disturbances (such as
lightning or disturbances in the electrical
utilities power grid) in the area
surrounding the network to which this
product is connected. These surfaces
should be handled with caution when the
AUI cable is not connected to aproperly
grounded DP
3000 Computer System.
SERVICING
WARNING
Any servicing, adjustment, maintenance, or
repair of assenlblies within the DP 3000
ca binet must be performed only by
qualified personnel.
WARNING
This product is not designed for
attachment to a network serving an area
which contains multiple unconnected
power system
safety grounds. Before
installing this product, verify that all of
the power system safety grounds are
securely interconnected in the area served
by
the local network.
WARNING
Do not connect this product to an
ungrounded· network coaxial cable.

CONTENTS
Section 1
GENERAL INFORMATION
General Description 1-1
Equipment Supplied 1- 3
System
Interface 1-4
Link Address 1- 5
Specifications......................................................................................... 1- 5
Section 2
INSTALLATION
Current Requirements 2-1
Channel Address Switch 2-1
Cables 2-3
Installing the LANIC 2- 4
Start Up ~ 2-6
Reshipmen t. , , " : 2- 6
Section 3
PRINCIPLES OF OPERATION
LAN Interface Controller (LANIC) ~ 3-1
Host to LANIC Communication 3-1
LANIC MPU and Firmware , 3-3
Local Communications Controller 3- 3
Direct Memory Access 3- 3
Firmware Download and Configuration 3- 3
Firmware Download 3-3
Setting Station Address 3- 3
Queue Initialization 3-4
Transmit Operation 3-4
Types of Packets Transmitted 3-4
Transmit Buffer Management. 3-4
Queuing of Transmit Buffers :::' 3-4
Transmit Operation Example 3-4
Receive Operation 3-4
Types of Packets Received 3-4
Receive Buffer Management 3- 5
Queuing of Received Packets 3- 5
Receiver Blind Spots 3- 5
Receive Operation Example 3- 5
Error Management ,............................... 3- 5
Self-Test Operation 3-6
System In terru pt. .................................... ..................................... 3- 6
Feb 85
vii

CONTENTS (continued)
SINTR 0 Self-Test In terru pt. " 3- 6
SINTRI LANIC Interrupt. 3-6
Interactive Command Completion 3-7
Interactive Comnland Acknowledgement. 3-7
Batch Command Completion 3-8
Fatal Error Response ,. 3-8
LANIC Resets , 3-8
Power-On Reset 3-9
Hard Reset. 3-9
Soft Reset 3-9
Z-80 Reset. , 3-10
Power-Fail Warn 3-10
Self-Test 3 -1 0
Manually Initiated Self-Test 3-10
Remotely Initiated Self-Test. 3 -1 0
Idle Self -Test ,3 -1 0
Visual Indicators · , , 3 -10
Attachment Unit Interface (AU!) 3-10
MAU Power Control Circuit. 3-12
LEDs 3-12
DO LED Pair ' 3-15
CL LED Pair 3-16
CR LED Pair 3-16
H through Nand *LEDs ,3- 16
TX, RX, MN, DL, RO, Q, and IT LEDs 3-16
Medium Attachment'Unit (MAU) 3-18
Receiver ,3- 18
Transmitter 3-18
Collision Detection 3-18
Jabber Fault Detection 3-20
Section 4
MAINTENANCE
Repair Philosophy 4-1
Self-Test 4-1
Appendix A
CONfIGURATION INFORMATION
Configuration Dialog A-I
Feb 85
viii

_GE_N_E_R_A_L_IN_F_O_R_M_A_T_IO_N ---'I~
This manual presents installation and service instructions for the HP 30242A LAN/3000 Link Local Area
Network Interface Controller. This section contains general information covering the HP 30242A
LAN/3000 link product, and includes adescription and specifications.
GENERAL DESCRIPTION
The HP 30242A LAN/3000 link is an implementation of the IEEE 802.2 and IEEE 802.3 Local Area
Network (LAN) standards and is used in HP 3000 computer systems. The HP 30242A allows the !:lP
3000 to communicate with other HP 3000s over an IEEE 802.3, O. 4-inch baseband Local Area Network
(LAN).
The IEEE
802.3 Local Area Networks (LANs) consist of three major elements: acoaxial cable transmission
medium, units
to access this medium (Medium Attachment Units, or MAUs), and controllers. For the
HP 30242A, the controller is the Local Area Network Interface Controller (LANIC).
Afitting, called atap, pierces
the coaxial cable and provides aconnection from the cable to the Medium
Attachment Unit (MAU). An Attachment Unit Interface (AUI) cable connects the MAU to the LAN
Interface Controller (LANIC). The LANIC, in addition to controlling the other LAN elements, functions
as
the interface from the Local Area Network to the computer system. Atypical Local Area Network is
shown in figure 1-1. Each host computer system, including LANIC, AUI, tap, and MAU is called anode
on the Local Area Network. The LANIC, AU I, tap, and MAU are all part of the HP 30242A LAN/3000
link.
The HP
30242A LAN/3000 link is available for use with the HP 3000 Series 39, 40, and 42; and the HP
3000 Series 44, 48 64, and 68. The LANIC, MAU, and AUI cable are the same for all HP 3000 Series;
however, two
different LANIC cables are offered (see the paragraph "Equipment Supplied").
The
LAN/3000 link functions as an intelligent Direct Memory Access (DMA) channel which
communicates
with the host system via the system I/O backplane. Local intelligent control is provided by
amicroprocessor
and firmware on the LAN Interface Controller (LANIC). An 8-bit Z-80B
microprocessor (MPU) on the LANIC handles all the LAN/3000-to-host communication and performs
many link-level operations independently of the host. Atype 82586 Local Communications Controller
(LCC)
on the LANIC performs high-speed serial operations, packet address checking, network contention
control, packet formatting, and Cyclic Redundancy Check (CRC) generation and checking. The LCC is
controlled by the Z-80B through local (card resident) memory.
Feb
8S
1-1

General Information
HP 3000
r--~----i lANle
AUf CABLE
AUI CABLE
HP JOOO
50-OHM
TERMINATOR
50-OHM
TERMINATOR
AUf CABLE
""------I lANle
COAXIAL CABLE
COAXIAL CABLE
AUI CABLE
HP3000
HP 3000
Figure 1-1. Typical Local Area Network (LAN)
Feb 8S
1-2