HP 27140A Hardware Reference Manual

HP

9000 Series 500 Computer Systems

HP27140A

Asynchronous 6-Channel Multiplexer

(with Modem Control)

Hardware Reference Manual

Hewlett-Packard Company
Roseville Networks Division
8000 Foothills Boulevard
Roseville, California 95678

Fli;-

a:~

HEWLETT

PACKARD

Card

Manual

Assembly: 27140-60001

Update 1 (October 1988)

Part

Number: 27140-90007

E0688

Printed

in U.S.A.

June

1988

Notice

The

information contained

notice.

HEWLETI-PACKARD COMPANY MAKES

WITH

KIND
LIMITED
ABILI'IY AND FITNESS
Packard
consequential damages
use

of

REGARD

TO,

THE

shall not

this material.

be

in

this document is subject

TO

THIS

IMPLIED

FOR

liable for

in

connection with

MATERIAL, INCLUDING, BUT
WARRANTIES
A PARTICULAR

errors

contained

the

to

change without

NO

WARRAN'IY

OF

MERCHANT-

PURPOSE.

herein

or

furnishing, performance,

OF

ANY

NOT

Hewlett-

for incidental

or

or

Hewlett-Packard assumes

on

software

This document contains proprietary information, which is
copyright. All rights
photocopied, reproduced,
prior

Copyright © 1988

equipment

written consent

by HEWLETI-PACKARD COMPANY

no

responsibility for the use

that

is not furnished by Hewlett-Packard.

are

reserved.

or

of

Hewlett-Packard.

No

part

translated into

of

this

another

or

document

language without the

reliability

protected

may

be

of

by

its

2

Printing History

New editions are complete revisions
which are issued between editions, contain additional
pages to
title page change only when a new edition
No information is incorporated into a reprinting unless it appears as a
prior update; the edition does not change when

A software code may
level
Many product updates and
versely, manual corrections may
changes. Therefore,
product updates and manual updates.

be

merged into the manual by the customer.

be

printed before the date; this indicates the version

of

the software product at the time the manual

fIXes

do

not expect a one-to-one correspondence between

Edition 1

Update 1 ......................

..........................

of

the manual.

or

a new

do

not require manual changes and, con-

be

done without accompanying product

Update

update

an

update is incorporated.

or

packages,

and

replacement

The

dates

on

is published.

update was issued.

June

October 1988

the

1988

3

Safety Considerations

General

Safety Symbols

This product
tion with safety markings before operation.

Instruction manual symbol:
when it is necessary for
to

protect

Indicates hazardous voltages.

Indicates earth (ground) terminal. This symbol is sometimes
manual

and

related documentation must

the

product

the

user

to

refer

the

product against damage.

to

indicate circuit common connected

be

reviewed for familiariza-

will

be

marked with this symbol

to

the

instruction manual in

to a grounded

used

in

chassis.

order

the

''1U,jut,)

I Caution I

4

The warning sign denotes a

the

practice,or
could

result

dicated conditions

The

caution sign denotes a hazard.
cedure, practice,
to, could result in damage
Do

not

proceed

fully understood and met.

like, which,

in

injury. Do

are

or

the

beyond a caution sign until the indicated conditions

hazard.

if

not

not

fully

understood

like, which,

to

or

It

calls attention

correctly

proceed beyond a warning sign

destruction

performed

and

met.

It

calls attention

if

not

correctly performed

of

part

to

a procedure,

or

adhered

to

an

or

all

of

operating

the product.

to,

until

or

adhered

the

pro-

are

in-

Servicing

General

'1i"'H,[e)

I Caution I

Any servicing, adjustment, maintenance,
be performed only by qualified personnel.

SAFE'lY
installed is a safety class I
earthing
from the
or
been impaired, the

secured

STATIC

When any two materials make contact, their surfaces
atomic level
separation, one surface comes away with excess electrons (negatively
charged) while the other
level
sulators can easily build
working
many thousands
on
holding the charge.
tor
protection circuitry, the resulting current flow through the device
the temperature
tures are

EARm

terminal. An

main

source

supplied power

against

of

charge that

at

the rate

device

any unintended operation.

SENSmVE

and

electrons pass back

a bench

of

of

generation

and

the transient current pulse

of

also

susceptible

GROUND - The

product

un

interruptible safety

to

the

product

cord

set. Whenever

product

is

or

volts.

If

internal junctions to their melting points

must

be

DEVICES

is

electron deficient (positively charged).

developed depends

up

charges in excess

walking across a floor can build

The

amount

of

the charge

the discharge happens

to

dieletric damage due

or

repair

of

this

product

computer

and

input

it

made

and

of

and

on

which

this

product

is

provided with a protective

ground

wiring terminals, power cord,

is

likely

inoperative

forth between

on

the

of

static voltage developed depends

the capacitance

to

is

not effectively diverted by

must

be provided

that

the

protection

and

must

are

crushed

the

objects.

type

of

material. In-

20,000 volts. A person

up

a charge

of

the

go throUgh a semiconduc-

..

MOS struc-

to

high fields.

be

on

The

of

body

can

must

is

has

the

On

raise

The

resulting

tion.

Small geometry semiconductor devices

damage by static discharge.

The

MUX
should
Save

this

card

in the system,

its edges

damage

card

is

shipped in a transparent static shielding bag.

be

kept in this bag

bag for storing

or

extractor levers.

can

range

from

at

all times until it

or

transporting

do

not touch any components.

complete

the

card.

destruction

are

especially susceptible

is

installed in

When

Hold

to

latent

the

installing

the

card

degrada-

The

system.

the

only by

to

card

5

Preface

This manual describes
plexer Interface
HP

9000 Series 500 computer systems.

The

multiplexer accesses

EIA

specifications RS-232-C
These protocols
data

over telephone networks worldwide.
naming
with the electrical characteristics

To
the instructions found in the computer system manuals.

and

specification recommendation,

ensure proper installation

the

HP

27140A Asynchronous 6-Channel Multi-

Card

with Modem Control. This multiplexer is used in

up

to

six remote

or

ccrrr recommendations V.24

are

designed specifically for use with modems

of

and

operation, use

or

local terminals conforming

(CCITI

and

CCITI

those signals.)

V.24 is

this

manual along with

to

and

V.28.

to

transmit

the

signal

V.28 is concerned

6

Table

of

Contents

1 General Information

Description
Specifications

Features

Functional Specifications . . . . . . . . . . . . . . . . . . . .

Edit Functions
Electrical

Environmental Specifications

Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Supplied

Options and Additional Equipment . . . . . . . . . . . . . .

Suggested Cables for

Suggested Cable for Modem Installations . . . . . . . . . . .

RS-232-C Junction Panel
Documentation Required for Installation
Product Identification
Support Strategy

Cable Repair . . . . . . . . . . . . . . . . . . . . . . . . . . .

User Responsibility

System Console . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Buffer Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . .

................................

...........

...............................

Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . .

Communications

..

. . . . . . . . . . . . . . . . . . . . . . . .

and

Physical Specifications

Direct Current Requirements . . . . . . . . . . . . . . .

Physical Dimensions

....

Use with

.....................•.....

.............................

.........................

. . . . . . . . . . . . . . . . . .

........................

..

. . . . . . . . . . .

......................

...................

. . . . . . . . . . . . . . . . . . . . .

Terminals.

...

. . . . . . . . . . . . . . . . .

. . . . . . . . . .

...............

..

..

..
..

..
..
..

..
..
..
..
..
..

..

..

1 - 1
1 -2

1 - 2
1 -2
1 -2
1 -3
1 -3
1 -4
1-

1 -4
1 -4
1 -4
1 -4
1 -5
1­1 -5
1­1 -6
1 -6
1 - 7
1 -7
1-7
1 - 7
1 -8

4

5

5

2 Installation I Configuration

Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . .

and

Unpacking

Storage

Checking Power Requirements

Power Availability
Inserting the
Removing the
Testing
Attaching the Cables .

ConftgUl'ation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

the

MUX-to-Junction Panel Cable . . . . . . . . . . . . . .

RS-232-C Cables . . . .

Examining the

...•............................

Formula.

Card

Unit.

............................

Card

. . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . .

PCA

• . . . . . . . . . . . . . . . . . . . . . . .

..

... ~ . . . . . . . . . . . .

.....

. . . . . • . . . . . . . . . . . . .

. . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . .

• . .

..
..

..
..

..
..
..
..
..
..

2 - 1
2 - 2
2 - 2
2 - 2

2 - 2

2 -3
2 - 3
2 - 4
2 - 4
2 - 4 .
2 - 6
2 -6

7

3 Functional Description

Main Sub-assemblies . • . . . . . . . . . . . . . . . . . . . . . . .

Printed Circuit Assembly . . . . . . . . . . . . . . . . . . . .

Multiplexer-to-Panel Cables
RS-232-C Junction

Device Types Accepted

Variations from

Organization

The

Backplane Interface Circuits
Midplane Circuits

Frontplane Circuits • • • . . . . . . . . . . . • . . . . . .

Functional Blocks

Memory Interface Controller
Clock Driver

Microprocessor . • • . . . . . . . . . . . . • . . . • . • •

Z-SO

EPROM

RAM

Serial Communications Controllers . . . . . . . . . . . .

Line Drivers

...•...........................

Circuit Planes . . • . . . . . . . . . . . . . . . . . . . . .

to

SCC Command Interface . . . . . . . . . . . . .

. . . . . • • . . . . . . . . • . . . . . . . . . . .

•.•..•.•••.••.••.....•••.•.....

and

Panel

RS-232-C . . . . . . . . . . . . . . . . .

.....••...................

...•............•...•..•..

Receivers

•.........•.........

.............

....................

...............•.

.......................

.....••.......•..

..................

. . . . . . .

..
..

..

..

..

..

..
..
..

..

3 - 1

3 - 1

3 - 1

3 - 2

3 -2

3 - 2

3 -3

3 -3
3 -3

3 -3

3 -3

3 -4
3 -4

3 -5

3 -5
3 -5

3 -5

3-5

3 -6
3 -6

4 Troubleshooting

Description

Results
In

Troubleshooting

5 Component

Component Parts . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ordering Information

of

Self Test

................................

Case

of

Failure

.............................

Parts

.•.......................

............0..............

..........................

6 Reference

Other References . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supported Modems
Connecting Cables (RS-232-C)

...........................

.....................

7 Diagrams

..

..
..
..

4 - 1
4 - 1

4 - 2
4 - 2

5 - 1

5 - 2

6 - 1
6 - 2
6 - 6
6 - 6
6 - 7

8

Index

1

General Information

This

manual describes the the

plexer

(MUX)
27140A",
The

terms "board", "card"

ly as distinct from the entire product.

Interface.

and

its full name interchangeably

HP

27140A Asynchronous 6-Channel Multi- .

We

use the terms "multiplexer", "MUX", "HP

to

describe

and

"PCA" designate

the

the

entire product.

printed circuit assemb-

Description

The

HP

27140A accesses any of the computers using
Channel Input/Output backplane standard. (Channel 110 is a Hewlett­Packard standard derming the electrical
an

Input/Output system.)

V.24 and V.28 communications standards.

The

factory setting for the information transmission

The

MUX

is also programmable

See Chapter 2, "Installation and Configuration", for the information
needed

This

modems from remote locations via telephone lines.
appropriate control lines for connection
RS-232-C

this

devices,

slot in the computer backplane.

Your local telephone company
install conditioned telephone lines
them.

to

use the six communications ports.

multiplexer provides for Input

or

CCITT V.24

multiplexer .

and

The

supports any

The

multiplexer supports RS-232-C

to

and

V.28.

MUX

also communicates with local, direct-connect

mix

of

six peripherals while using only

or

and

physical characteristics for

process rates from 50

and

Output

to

any modem which adheres

There

are

your long distance carrier

if

your modems

the

Hewlett-Packard

and

CCITT

rate

is 9600 baud.

to

19200 baud.

(110) through multiple

This

product has

no

modems included with

one

will

be able

or

applications require

card

the

to

to

General Information

1-1

Specifications

Features

Six

full duplex asynchronous serial I/O ports with

capability (satisfies European licensing requirements).

10

wire modem control

RS-132-C and

EIA

Full duplex modem operation

Support for use as a local system console on port

Programmable data rates for each channel.

Programmable number of stop bits:

Programmable parity:.

Programmable character size:

Parity, overrun, framing error check detects transmission faults.

Yumware based self test helps assure card integrity.

Programmable device
data transmission.

On-board buffering with DMA capability to send/receive data for multiple
ports in a single transfer.

CCITf

V.28

compatibility.

only.

o.

1,

1.5,

2.

odd,

even, none.

5,

6,

7,

or 8 data bits.

XON/XOFF handshaking to pace MUX output

Functional

Specifications

Capacity

1-2

General Information

Channels:

Buffering:

Transmit

Receive

Buffer Size: Effective lKbyte buffer allocated

Buffer

Size:

Six

channels - full duplex.

On card buffering with DMA capability to
send/receive for multiple ports in a single
transfer to reduce host
and increase throughput.

255

bytes per port.

dynamically over all

CPU interrupts

six

ports.

Communications

Interface

nata

Rates:

Level:

RS-232-C

Defaults to
to any of

and CCI'IT

9600;

software programmable

16

transfer rates:

V.2B.

SO,

75,

110,

134.5,150,300,600,900,1200,1800,2400,
3600,

4800,

7200,

9600,

and

19,200

baud.

Throughput:

Supports

six

interactive terminal users
running character mode at
Other RS-232-C applications receiving
and sending simultaneously should
at

9600

baud or slower. (Refer to Table

1-1

for details on transmission rates.)

Modem Support:

Originate mode.

Auto-answer mode.
Modem connection timer.
Lost receiver ready timer.
No-activity timer.
Host control of every card output modem
line.

Communications Mode: Asynchronous, bit serial.

Break Detection:

Break conditions are recognized by the
card and cause interrupts to the host. The

MUX can

as

they are needed. A break

condition for

also

generate break conditions

two

consecutive character

times.

is

Optional Handshaking: All handshaking

optional and
programmable. The protocol characters
are also programmable. Device controlled
XON/XOFF

is

performed at the card

level.

19,200

is

a "space"

baud.

be run

Edit Functions

The MUX passes edit functions (i.e., backspace, character delete, etc.) to
the host. They are then managed by the host operating system.

General Information

1-3

Electrical

and

Physical

Specifications

Direct Current

Requirements

Physical Dimensions

Environmental

Specifications

Firmware

Typical

Voltage

+5

+12

-12

Length:

Width:

1hickness:

Weight

The
operates
temperature
condensing) should

The
Memory) chip.
download monitor programs. Self test is described in
"Troubleshooting".;
control codes for
stored
to

use port 0 for communications with a terminal. This feature is typically

used

MUX

between 0

PCA

includes

properly.

for

the

(card

card

will

system control console for

Current

only):

is

sensitive

and

range

be

one

The

EPROM

The

board

The

1.380 A

0.084

A

0.125

A

17.72cm

17.70cm

2.95mm

270

grams

to

humidity

SOOC

and

should

from

-40

to

maintained

EPROM

download monitor directs
operation

EPROM

(Erasable, Programmable,

contains

and

also provides enough

+ Two a

(Standard

7SOC.
between

insures

Deviation)

2.298 A

0.159

A

0.150

A

(7 in)
(7 in)

(0.12 in)

(9.5 oz)

and

temperature.

be

stored

Humidity (@ 4<rC non-

5%

and

the

on

board

the

that

the

initial system boot-up.

The

only where

95%.

Read

self

test

and

Chapter

downloading

they

are

correct

on

board

card
the

Only

4,

intelligence

of

and

Equipment

Supplied

1-4

General Information

The

HP

27140A is designed for

Description

Multiplexer
RS-232-C Junction
Cable, PCA-to-Panel, 1

This Reference

PCA

Panel

Manual

metre

HP

9000 Series

500

computers:

Part

Number

27140-60001

28659-60005
28659-63002

27140-90007

Options

and

Additional Equipment

The

following

fices

if

you
cable connects to the standard cable for greater
Use of the Test Hood

27140A

Option #001:
Option #019:
Option #540:

Option #550:

items are

did not order them

also

available through HP Sales and Support Of-

is

described in Chapter

Extension cable

19

inch Rack Mounting Bracket Kit, pIn

Mounting Bracket Kit for

5061-4963

pIn
Mounting Bracket
pIn

5001-5280

with

the

system.

10

metre, pIn

Kit

for

The 10-metre extension

flexibility

4,

"Troubleshooting".

28659-63004
9040A
92211R

in installation.

5061-4962

Systems,

Cabinet,

Suggested Cables for

Use with Terminals

Suggested Cable for

Modem Installations

RS-232-C Junction

Panel

27140-60003

The

following

tion Panel to your terminals:

• HP

• HP

• HP

• HP922190

The HP 922190 cable, 5 metres long,
a modem.

The
which provides serial, asynchronous interconnections between the multi-

plexer card and a modem or terminal device.

has

tors on the front.

13242M
13242N
13242Y

RS-232-C

one 62-pin receptacle and

Test Hood

cables are designed to connect the MUX RS-232-C Junc-

(5

metres)

(5

metres)

(5

metres)

(3.8

metres).

is designed to connect the MUX to

Junction Panel

(28659-60005)

six

25-pin D subminiature female connec-

is

a six-port junction box

See Figure

1-1.

This

panel

I Note I

RS-232-C

This
should be replaced on failure. Hewlett-Packard does not support user
maintenance of
Office for additional information.

Junction Panel

this

component. Contact your

is

considered a field replaceable unit and

HP

Sales and Support

Generallnfonnation

1-5

II

~

Screw

Documentation

Required for

Installation

Product

Identification

Figure 1·1. RS·232-C

To

insure

proper

manual, the computer system reference manual,

stallation manuals for all

installation

of

Junction

of

the

the

peripherals you intend

Panel

multiplexer, you should study this

MUX.

The

interface

part

number (27140-60001)
digits (A-2450) printed below
printed
alphameric fields. Both

affect you. However, your

it is a good idea

The

sticker will look like

on

card

a label

to

supplied with the

and

a date

the

affIXed

to

are

CE

record all

the card.
production sequence numbers,

may

of

this information.

this:

HP

27140A

code

consisting

part

number. This information is

The

label also has two

need

to

refer

HP

28659-60005

and

the

to

product

of

to

them

reference

attach

is identified by a
a letter

occcasionally, so

other

and

to

and

will

and

the

not

in-

four

1-6

GenerallnformatioD

27140-60001

A-2450

Above,
identification label.
while the

"X"

represents any alphanumeric character.

board

is identified.

XXXXXX

If

it is

missing,

XX

service for your

Do

not

MUX

may.be delayed

remove

the

Support Strategy

The

HP

27140A Multiplexer Interface
(FRU).
repairable except
nificantly reduces downtime
ing
EPROM
card
protect the

The

electronic components

under

the

original card. Whenever

and

retain it for insertion in

will not have

an

EPROM

EPROM
from static discharge.

factory conditions. Exchanging

and

compared

the

PCA

the

on

it. Insure

card

is a Field Replaceable

circuitry

to

removing, repairing

is replaced, remove

replacement card, as

on

that

precautions

the

card

are

boards

are

not

also sig­and
the

the

taken

Unit

replac-

new

to

Cable Repair

User Responsibility

Component level repair is not
attempt repair
ception

at

this level may invalidate their warranties.

to

this guideline is the

will remove it, have it tested

The

multiplexer is designed with

of

Because

or

modify the

failure of the cable

the tolerances for

board

connector

at

the board connector end requires replacement

supported

EPROM.

and

replace it if necessary.

an

the

cable connector it is impossible

end

by Hewlett-Packard.

Your

HP

extremely compact cable connector.

of

the

PCA

-to-Panel cable.

the cable assembly.

The

junction panel

connector. Tables in Chapter

this cable.

There

are

no physical adjustments
preventive maintenance required. You may want
card

cage occasionally.
on this subject.
in Chapter

4.

If

In

the

end

case

board

of

the cable was fabricated using a conventional

6,

"Reference", list

to

make

on

this

If

so, your computer manual will have instructions

of

apparent

fails, call your

card

failure,

HP

Customer Engineer.

Users

The

sole ex-

Customer Engineer

Any

the

pin assignments for

card

nor

is any special

to

clean

the

computer

run

the

self test described

to

who

repair

of

System Console

If

the system console is attached
the resident
console at 9600 baud, using 8 bit ASCII characters with
bit.

There

fIrmware

will

be

one

on

this

stop bit.

to

port 0 of

card

will transmit

the

RS-232-C

to

and

Junction

receive from

no

parity check

General Information

Panel,

the

1-7

Buffer Capacity

The

HP

27140A uses a 4Kbyte buffer to temporarily store
to the host computer. Because
each character received, this capacity provides actual character storage
equal to lKbyte. Buffer space is dynamically allocated
they require it. Thus, no one port has specific buffer address space dedi­cated to it. This buffer capacity limits the throughput
1-1 lists four possible combinations

Table 1-1. ButTer Capacity Baud Rate Limits

of

the distinctive system

of

baud

rates for the

used

to

of

data

the

the

HP

MUX.

27140A.

to

be

sent

to identify

six ports as

Table

I Note I

Port

0 19200

1

2

3

4

5

All

of

these speeds assume full duplex operation

tion

of

channel capacity. Operation at higher speeds

result in

When all six terminals
is unlikely that the users could overload the buffer, since human beings
not enter data rapidly enough to use the potential
case, all six ports could

DATA

OVERRUN

1

4800* 19200 19200 9600*
4800* 19200
4800*
4800* unused
4800* unused

*Slower rates may

errors.

are

being used by people in interactive programs, it

be

programmed to 19200.

Baud Rate

2

19200 19200

2400*

unused

2400*
2400* 9600*
2400*

be

used.

and

of

3

near

100% utiliza-

than

noted

19200 baud.

4

9600*

9600*
9600*

9600*

may

In

this

do

1-8

General Information

Update 1 (October

1988)

2

Installation / Configuration

I

Caution

Please read all
puter before proceeding with the installation
plexer.

Installing

1.

Unpacking
discussed).

2. Inserting the card into the computer

3. Testing the

4.

Attaching MUX-to-Junction Panel, Modem,
connect cables.

After installation, the card

of

Many

I

or

degradation by electrostatic discharge. See

the front

tractor levers

of

the sections

this

PCA

involves the following steps:

and

examining the

unit.

the components

of

this manaul.

to

avoid damage

of

is

configured by programmatic instructions.

of

the

To

handle this card, use only

to

this chapter which apply

of

your

HP

card

(temporary storage

card

cage.

and

HP

27140A

components.

are

susceptibl~

the

safety considerations in

/~

to

your com-

27140A Multi-

is

also

RS-232-C direct

to

destruction

the

edges

and

ex-

Site Preparation

There

is

no site preparation required for this product other than

installation

Using the
C Junction Panel. Consideration must
Junction Panel mounting bracket so that these cables present
to

traffic

the

length

15

metres

of

the host computer.

MUX

will

require that several cables

or

maintenance

of

cable from the card itself

(SO

feet).

of

the computer.

be

attached to

be

given

to

locating

The

RS-232-C standard limits

to

any terminal device

Installation I Configuration 2

the

proper

the

RS-232-

RS-232-C

no

problems

to

a total

of

..

1

Unpacking and

Examining the

peA

Remove

material in a clean workspace.

ing parts,
for damage.

the

and

PCA

from its protective envelope

verify

the

part

Inspect

number. Also,

the

card

check

and

place

itself for

the

it

on

damage

other

subassemblies

anti-static

or

miss-

Storage

Checking Power

Requirements

H you

store

the

card
cally safe container.
cage.

If

you must
packaging material
must

protect

age

containing

This

card

draws its electrical
must verify
load.

Refer

store

this

PCA

the

that

the

to

Table

Table 2-1. Power

Voltage

+12

for any reason,
The

safest

place

the

peA

outside

or

have

the

card

from static electricity

card

upright (like a

requirements

computer

2-1 for

+5

-12

can

accommodate

the

power

Requirements

Mean

6.90W

1.01W 1.90W

1.62W

place

it

in

for

the

PCA

of

the

packed

level

by

and

book

on

from

requirements

for

Power

an

electrically

is in

computer,

a commercial firm.

impact.

a shelf),

the

host

this additional

of

the

UP

2alevel

and

the

computer

use

the

Place

to

avoid crushing.

computer.

the

MUX.

27140A

12.06W

I.SOW

mechani-

card

original

You

the

pack-

You

power

Power Availability

Formula

2-2

Installation I Configuration .

Mean

power

required

ment

of

the

card.

use

the

mean

power

ment.

Check

the

the

backplane
watts) for
wattage available. This difference
27140A.

Power

Available

for

the

MUX

There

must

each

voltage level.

Power

Available Power

for

the

MUX

the

be

at

other

more

can

be

For

the

purposes

level figures plus

computer

each

cards

= by

>

system

voltage level.

in

the

Power

Supplied

the

Host

power

available

Required

by

the

MUX

thought

computer,

of

as

of

calculating

20%

manual

After

is

the

power

- L

to

the

the

nominal

probable

as

the

maximum

for

the

total

summing

subtract

available for

Power

all

{

MUX

than

the

this

other

the

power

power

power
total

require-

power

power

supplied

fIgUl'es (in

from

use

by

Loads

Of}

cards

requirement

usage,

require-

to

the

the

HP

at

If

the power available
each voltage
remove another board before installing the card. Contact your
and Support

level,

Office for details.

you

is

too

low

to meet the requirements of the MUX at

must

augment the computer power supply, or

HP

Sales

Inserting the

ti''''''',)

Card

Refer to the

your

system

Before attempting

down"
disconnect the
damage both the computer

be covered by warranty.

The

27140A
card in place. Hold the card
it into the track-like guides of the slot.
plane connectors (you'll notice the resistance), press
backplane.
tractor levers will start to
the card

System

for the proper placement and positioning of the card.

procedure

MUX card uses friction at the backplane contacts to hold the

As the card reaches its limit of travel, the free ends of the

is

fully

Installation

to

install this

and

current

seated

and

TURN

OFF

could result

and

firmly

fold

down

in

the backplane.

Configuration

(or

any) peA, follow the computer "shut .

the computer power supply. Failure to

in

an

electrical shock,

the card. Any

by

the extractor levers and gently push

Once the card touches the back-

against the card. Press on them until

Guide included with

resultant

and

damage will

it

firmly

it

may

into the

not

ex-

Removing the

Card

I

Note

To remove the card, grasp the free ends of the extractor levers, and pivot

you

(away

from

them toward
slightly
careful to pull both levers
its components.
charge discussed in the paragraph on unpacking the card
the board once

Repair or replacement of other electronic components could invalidate

I

your warranty.

from

the connectors at the backplane. Continue pulling, but be

Use the

you

have

the card cage). This will force the card out

evenly

to

avoid

jamming the PCA or breaking

same

caution against static build-up and dis-

while

removed it.

Installation I Configuration

handling

2-3