IBM 2702 Technisches Handbuch

Systems

R.eference Library

IBM

2702/2703

Transmission

Controls

Original Equipment Manfacturers' Information

File

No.

8360-19

Form

A27-3012-0

This

publication

describes

the

IDM

2702/2703

Transmission

Control

interfaces.

The

processor

interface

description

includes

a

description

of

the

operating

signals

and

responses.

The

interface

descriptions

provide

device

attachment

infor-

mation.

The

electrical,

mechanical,

and

cabling

specifications

of

these

interfaces

are

provided,

together

with

physical

planning

requirements.

PREFACE

This

manual

references

information

contained

in

the

System/360

I/O

Interface

Original

Equipment

Manufac-

turer's

Information

Manual,

Form

A22-6843.

Unless

otherwise

stated,

the

grounding

of

various

external

devices

to

the

2702/2703

is

made

at

the

power

source

common.

However,

when

the

power

sources

differ

(thus

allowing

the

frames

of

different

machines

to

be

at

different

potentials)

and when

the

machines

are

close

enough

to

one

another

to

present

a

hazardous

condition,

other

grounding

methods

must

be

used.

In

no

case

should

interface

lines

designated

as

grounds

be

used

to

establish

a

common

frame

grounding.

First

Edition,

February

1968

Significant

changes

or

additions

to

the.

specifications

contained

in

this

publication

are

continually

being

made..

When

using

this

publication

in

connection

with

the

operation

of

IBM

equipment,

check

the

latest

SRL

Newsletter

for

revisions

or

contact

the

local

IBM

branch

office.

The

data

contained

herein

is

current

as

February

16,

1968.

Requests

for

copies

of

IBM

publications

should

be

made

to

your

IBM

representative

or

to

the

IBM

branch

office

serving

your

locality.

A

form

is

provided

at

the

back

of

this

publication

for

the

reader's

comments.

If

the

form

has

been

removed,

comments

may

be

ad-

dressed

to

IBM

Corporation,

Systems

Development

Division,

Product

Publications,

Dept.

860,

P.

O.

Box

12275,

Research

Triangle

Park,

North

Carolina

27709.

ii

CONTENTS

CHAPTER 1.

INTRODUCTION

..

1-1

Timeouts.

2-42

Features

1-3

IBM

Telegraph

Line

Adapter

-

Operations.

2-42

2702

Features

1-3

'fransmission-Code

Error

Detection

Employed.

2-42

2703

Features

1-4

Modes

of

Operation

2-45

Communications

Facilities

1-6

Timeouts

2-45

Addressing

1-6

IBM

World

Trade

Telegraph

Terminal

Control

2-45

Transmission

Code.

2-45

CHAPTER 2. OPERATIONS

2-1

Special

Characters

2-45

2702

Operator's

Panel

2-1

Line

Cont

rol

.

2-47

Operator

Switches

2-1

Timeouts

2-47

Operator

Panel

Indicators

2-1

Message

Restrict

ion

2-48

2702

CE

Panel

2-3

Telegraph

Terminal

Control

Type

I -

Operations

2-48

CE

Panel

Switches

2-3

Transmission

Code

2-48

CE

Panel

Indicators

2-7

Special

Charact

ers

2-48

2703

Operator's

Panel.

2-10

Terminal-to-Terminal

Operation

with

Search

Operator

Panel

Switches

2-10

Command

2-50

Operator

Panel

Indi

cators

2-10

Timeouts

2-50

2703

CE

Panel

2-10

Message

Restrictions

2-50

CE

Panel

Switches

2-10

Telegraph

Terminal

Control

Type

II

-Operations

2-52

CE

Panel

Indicators

2-10

Transmission

Code.

2-52

Metering

2-10

Special

Charact

ers

2-52

Metering

with

the

TPS

Feature.

2-11

Binary

Synchronous

Communications

(BSC)

2-53

Reset

2-11

System/360

1/0

Interface.

2-26

CHAPTER

3.

COMMUNIcATIONS INTERFACES

3-1

Data

Bytes

2-26

Int

erface

Line

Descript

ions .

3-1

'Status Byte

2-26

EIA

RS232B

Interface

Description

3-1

Sense Byte

2-29

Automatic

Calling

Unit

Interface

3-3

Interface

Stop

Signal.

2-29

2702/03

Line

Adapters

.

3-5

Halt

1/0

(Interface

Disconnect

Signal)

2-29

IBM Line

Adapter.

3-5

Commands

•

2-29

Telegraph

Line

Adapter

3-5

Control-Type

Commands.

2-29

Data-Set

Line

Adapters

3-5

Transmit-Type

Commands

2-35

2702/03

Auto

Call

Feature.

3-9

Receive-Type

Commands.

2-38

IBM

Terminal

Control

Type

I -

Operations

2-39

CHAPTER

4.

EXTERNAL cABLING

4-1

Transmission

Code

2-39

Cable

Requirements

4-1

Special

Characters

2-40

Serpent

Contacts.

4-1

Modes of

Operation

2-41

Cables

4-1

Emergency

Power

Off

(EPO)

Cabling

4-1

iii

Figure

Page

1-1

Data

Communication

Units

Attachable

to

2702/2703

1-2

At

t

achable

Terminals

and

Comm

unica

t

ion

Facilities

for

Domestic

Use

1-7

1-3

Attachable

Terminals

and

Communication

Facilities

for

World

Trade

Use.

1-10

1-4

Addressing

Scheme.

1-11

2-1

2702/2703

Commands

2-2

2702

Operator

Panel

2-3

2702

Operator

Panel

with

TPS

and

2712

Features

2-4

2702

CE

Panel

2-5

2703

Operators

Panel

with

TPS

and

2712

Feature

2-11

2-6

2703

CE

Panel

2-13

2-7

CE

Panel

Roller

Indicators

•

2-17

2-8

Status

Bits

2-26

2-9

Ending

Status

CE,

DE,

and

UE

2-27

2-10

Ending

Status

on

Halt

I/O

•

2-28

2-11

Sense

Bit

0,

Command

and

Reject

2-30

2-12

Sense

Bit

1,

Intervention

Required

2-30

2-13

Sense

Bit

2,

Bus-Out

Parity

Check

2-31

2-14

Sense

Bit

3,

Equipment

Check

2-31

2-15

Sense

Bit

4,

Data

Check

2-32

2-16

Sense

Bi

t

5,

Overrun

2-32

2-17

Sense

Bit

6,

Lost

Data

Set

by

Common

Controls

2-33

2-18

Sense

Bit

7,

Timeout

Complete

2-34

2-19

Dial

Digits

in

System/360

Byte

Structure

2-37

2-20

IBM

Terminal

Control

Type

I

Transmission

Code

2-40

2-21

IBM

Terminal

Control

Type

I

Transmission

to

Int

erface

Conversion

•

2-40

2-22

Special-Character

Configuration

2-40

2-23

Sample

Message

Sequence

2-42

2"24

IBM

Terminal

Control

Type

II

Transmission

Code

2-44

2-25

TC-n

Transmission

to

Int

erface

Conversion

2-44

2-26

Special

Charact

er

Configuration

2-44

2-27

Sample

Message

Sequence

2-46

2-28

Baudot

Transmission

Code

2-46

2-29

Transmission

Code

Conversion

to

Interface

Code

2-46

2-30

Special

Characters

2-46

2-31

Baudot

Transmission

Code

2-49

2-32

Transmission

Code

Conversion

to

Interface

Code

2-49

Table

Page

2-1

Correlation

of

Load

Line

Ctl

Word

Switch

with

LCW

Segments

2-7

2-2

Clock

Ring

Indicators

2-8

2-3

Operator

Panel

Switches

2-12

2-4

Operator

Panel

Indicators

2-13

2-5

CE

Panel

Switches.

2-14

2-6

CE

Panel

Indicators

2-18

iv

ILLUSTRATIONS

Figure

Page

2-33

Special

Charact

ers

2-49

2-34

Telegraph

Terminal

Control

Type

I

with

AT&T

83B2/83B3

or

Western

Union

Plan

11SA

Terminals

2-51

2-35

TWX

Transmission

Code

2-52

2-36

Transmission

Code

Conversion

2-52

2-37

TWX

Special

Characters

2-53

3-1

Data

Set

Interface-(Start/Stop)

3-2

2712

Feature

Data

Set

Interface

3-2

3-3

Automatic

Calling

Interface

3-4

Automatic

Calling

Unit

Interface

Circuit

Designations

3-4

3-5

2702

Telegraph

Line

Adapter

3-6

2703

Telegraph

Adapter

3-7

2702

Data

Set

Line

Adapter

#3233

Plugged

for

Switched

Network,

Full

Duplex

3-8

2702

Data

Set

Line

Adapter

#3233

Plugged

for

Private

Line,

Full

Duplex.

3-10

3-9

Input

Line

Characteristics

•

3-11

3-10

Out

put

Line

Charact

erist

ics

3-11

4-1

2702/2703

Cables.

4-2

Connector

Blocks

and

Contact

Location

4-2

4-3

Serpent

Cont

act

4-3

4-4

2702/2703

Cable

Connectors

4-4

4-5

2702/03

to

System/360

Cables

4-5

4-6

2702/03

EPO

Cable

4-6

4-7

2702

Data

Set

Cable

(Group

No.

403);

2703

Data

Set

Cable

for

2712

(Group

No.

428)

4-7

4-8

Group

404-Domestic

TTY

4-8

4-9

Group

405-Customer

Owned

Comm.

Line

Cable

4-9

4-10

Group

406-WTC

Teletype

Cable

4-10

4-11

Group

408-Data

Set

Cable.

4-11

4-12

Group

409-Domestic

Teletype

(2702)

4-12

4-13

2702/3

IBM

Limited

Distance

Line

Adapters

Type

lA,

1B

and

2703

Type

2B

to

Line

Connection.

4-13

4-14

2703

to

Data

Set

(Group

424); 2703

to

2711

(Group

442)

•

4-14

4-15

2703

to

Telegraph

Lines

(Group

No.

425)

•

4-15

4-16

2703

to

Auto

Call

Data

Set

(Group

No.

427)

•

4-16

4-17

2703

to

(Synchronous)

Data

Set

(Group

No.

429)

4-17

TABLES

2-7

Meter

Operation

Under

Various TPS

Conditions

3-1

Length

of

Timeout

Sequence

for 2702

Read-Type

Commands

•

4-1

2702

Cable

Data

4-2

2703

Cable

Data

2-25

3-10

4-18

4-19

The

IBM

2702/2703

Transmission

Control

Units:

III

Permit

combining

data

processing

and

data

com-

munications.

•

Direct

and

control

data

flow

between

the

processor

and

remote

terminals.

o

Operate

in

byte-interleaved

mode.

Also:

•

The

2702

can

operate

from

1

to

31

half-duplex

lines.

(ll

The

2703

can

operate

from

1

to

176

half-duplex

lines.

G

The

2702

provides

speeds

up

to

180

bps,

or

up

to

600

bps

with

added

features.

Cl

The

2703

provides

speeds

up

to

600

bps,

or

up

to

2400

bps

with

added

features.

In

addition,

the

2702/2703:

e

Receives

and

transmits

data

serially

by

bit.

o

Transfers

data

to

and

from

channel

by

byte.

QII

Does

not

restrict

message

length.

The

2702/2703

Transmission

Control

Units

(from

now

on

referred

to

as

multiplexers)

provide

for

the

on-line

attachment

of

various

I/o

devices

via

private

and

commercial

common-carrier

communications

facilities

to

a

channel

that

conforms

to

the

standard

IBM

System/360

I/o

Channel

Interface

(Figure

1-1).

Data

communications

equipment

that

can

be

attached

to

the

multiplexers

inclUde

the

following:

IBM 1030

Data

Collection

System.

IBM 1032

Digital

Time

Unit

(2702 only).

IBM

1050

Data

Communication

System,

IBM

1060

Data

Communication

System.

IBM

1070

Process

Communication

System.

IBM 2712

Remote

Multiplexer,

Models

1

and

2,

IBM

2740

and

2741

Communications

Terminals.

CHAPTER

1. INTRODUCTION

AT&T

83B2/83B3

Type

Selective

Calling

Ter-

minals.

Western

Union

Plan

115A

Terminals.

Common

Carrier

TWX

Stations

(8-level

code).

European

Teleprinters

(World

Trade

attachments).

Another

IBM

System/360

via

an

IBM 2701

Data

Adapter

Unit

equipped

with

appropriate

Syn-

chronous

Features

(2703

only).

Another

IBM

System/360

via

an

IBM 2703

Trans-

mission

Control

equipped

with

the

appropriate

Synchronous

Features

(2703 only).

IBM

2780

Data

Transmission

Terminal

(2703

only),

IBM

1130

Computing

System

equipped

with

the

Synchronous

Communications

Adapter

feature

(2703 only).

Each

multiplexer

occupies

one

of

eight

allowable

control-unit

positions

in

a

multiplexer

channel.

Data

transfers

between

the

multiplexers

and

the

multi-

plexer

channel

are

in

the

byte-interleaved

mode,

each

byte

consisting

of

eight

data

bits

and

one

parity

bit.

Each

multiplexer

is

flexible

in

line

capacity,

trans-

mission

code,

and

speed.

The

basic

2702

can

have

15

half-duplex

lines

and

operates

at

speeds

up

to

134.5

bps

for

any

or

all

attached

communications

lines.

(Optional

features

enable

the

2702

to

operate

up

to

15

lines

in a

start-stop

mode

at

transmission

rates

up

to

600

bps.)

The

2703

can

operate

1

to

176

half-duplex

lines

at

speeds

up

to

134.5

bps

for

any

or

all

attached

communications

lines

(as

an

optional

feature

up

to

72

lines

at

600

bps).

Optional

features

available

enable

the

2703

to

operate

in

a

synchronous

mode

at

transmission

rate

up

to

2400

bps.

On

input

messages

(data

being

sent

to

the

channel),

the

mUltiplexer

accepts

data

serially

by

bit

from

the

remote

terminal

via

the

communications

line,

assem-

bles

this

data

into

characters

and

transfers

the

char-

acters

serially

to

the

channel.

On

output

messages

(data

being

sent

to

the

mUltiplexer

from

the

channel),

the

multiplexer

accepts

the

data

serially

by

byte

and

transfers

it

serially

by

bit

to

the

remote

terminal.

The

multiplexer

does

not

impose

restrictions

on

message

length.

All

2702/2703-channel

message

buffering

is

done

by

the

processor.

All

necessary

bit-byte

conversion,

data

control,

and

signal

match-

ing

to

common-carrier

equipment

are

accomplished

by

the

multiplexers.

Introduction

1-1

IBM 2780*

IBM

1050

IBM

1060

IBM 2712

IBM 1070

IBM 2740 or

2741

Figure

1-1.

Data

Communication

Units

Attachable

to

the

2702/2703

1-2

IBM 1130*

2702

or

2703

o

1M:I;p~:-e~

. Processor

IChannel r

L

_____

-'

* Connects only to 2703

**

Connects only to 2702

FEATURES

2702

Features

The

following

features

provide

expanded

capability

for

the

IBM 2702

in

terms

of

line

speed,

number

of

lines,

and

other

functions.

Speed

Extension

Feature.

Enables

the

2702

to

oper-

ate

at

speeds

up

to

600

bps

on

all

15

lines.

31-

Line

Expansion

Feature.

Expands

the

line

handl-

ing

capabilities

of

the

2702

to

31

half-duplex

lines

at

134.5

bps.

The

31-Line

Expansion

feature

and

the

Speed

Extension

feature

are

mutually

exclusive--that

is,

either

feature

may

be

selected,

but

not

both.

Auto

Call

Feature.

Provides

the

2702

with

automatic

dialing

capability

of

up

to

S

communications-line

attachments.

Auto

Call

Expansion

Feature.

Expands

the

automatic

dialing

capability

of

the

2702

up

to

16

communications-

line

attachments.

The

Auto

Call

feature

is

a

prere-

quisite.

Auto

Call

Adapter

Feature.

Matches

the

interface

of

the

common-carrier

Automatic

Dialing

Unit;

the

Auto

Call

feature

is

a

prerequisite.

The

Auto

Call

Adapter

provides

for

attachment

of

the

2702

to

private

or

common-carrier

switched

networks,

via

Western

Electric

Automatic

Calling

Unit SOlA1

or

SOlC2. A

maximum

of

16 Auto

Call

Adapters

can

be

chosen

for

one 2702

when

the

Auto

Call

ExpanSion

feature

is

installed.

One

adapter

is

required

for

each

auto

call

line.

The

Auto

Call

feature

is

a

prerequisite.

Two-

Processor

Switch

Feature.

Enables

the

2702

to

be

physically

attached

to

the

multiplexer

channels

of

two

System/360

processors.

The

2702

must

be

in a

neutral

state

for

the

switching

to

occur.

When

in

this

neutral

state,

the

2702

monitors

both

multiplexer

interfaces

and

automatically

switches

and

locks

to

the

first

channel

addressing

any

line

of

the

2702.

The

attached

processor

can

return

the

switch

to

neutral

under

program

control

or

through

a

manual

reset.

Data

Set

Line

Adapter.

Allows

attachment

to

the

fol-

lowing:

a.

IBM 2711

Line

Adapter.

b.

Western

Electric

Data

Set

103A*

for

operation

at

134.5

bps

on

Common

Carrier

Switched

Telephone

or

150

baud

TWX

networks.

*Or

equivalent

(see

Chapter

3)

.

c.

Western

Electric

Data

Set

103F2*

for

operation

at

134.5

bps

on

Telephone

Company

Type

3002

Private

Line

Service.

d.

Suitable

channel

termination

for

operation

on

Telephone

Company

Type

1006 (150

baud)

Channels.

e.

Western

Union

Data

Loop

Transceiver

11S3A*

on

Western

Union

Class

D (ISO

baud)

Channels.

f.

Western

Electric

Data

Set

(202Dl*

for

operation

on

Telephone

Company

Type

3002

Channels

or

Western

Union

Class

G

channels

for

600

bps

operation.

IBM

Line

Adapter.

Two

types

are

available:

a.

Limited-Distance

Line

Adapter

Type

I--Allows

attachment

to

privately

owned

or

leased

com-

munication

networks

of

4.

75

wire

miles

or

less

length.

With

this

feature,

a

data

set

is

not

needed.

Up

to

25

adapters

can

be

mounted

in

the

2702

unit;

additional

adapters

require

the

use

of

an

IBM 2711

Line

Adapter

Unit.

b.

Limited-Distance

Line

Adapter

Type

II--Allows

attachment

to

privately

owned

or

leased

com-

munication

networks

of

S

wire

miles

or

less

length.

With

this

feature,

a

data

set

is

not

needed.

A

maximum

of

15

adapters

(16

with

the

3l-Line

Expansion

feature)

can

be

attached.

IBM

Terminal

Control

Type

1.

Enables

the

2702

to

operate

with

the

IBM 1050, 1060,

and

1070

systems

or

the

IBM 2740

and

2741

terminals.

Three

speeds

are

available:

75

bps

134.5

bps

600

bps

Connection

IBM

1050

on

telegraph

lines

IBM 1050, 1060, 1070, 2740 Mod 1,

or

2741

IBM

1070,

2740

Mod 2

IBM

Terminal

Control

Type

II.

Enables

the

2702

to

operate

with

the

IBM

1030

Data

Collection

System

(1031A

Input

Station

and

1033

Printer)

or

the

IBM

1032

Digital

Time

Unit

at

a

speed

of

600

bps.

Telegraph

Line

Adapter.

Allows

attachment

to

Com-

mon

Carrier

Leased

Private

Line

Telegraph

Service.

Channels

that

can

be

attached

are

Telephone

Company

Type

1002

at

45.5

or

56.9

bps,

Type

1005

at

74.2

bps,

and

Western

Union

Class

A,

B,

and

C

Channels

at

45.5,

56.9,

and

74.2

bps,

respectively.

A

maxi-

mum

of

15

lines

is

allowed;

with

31-Line

Expansion

feature,

31

are

allowed.

Introduction

1-3

Telegraph

Terminal

Control

Type

1.

Enables

th~

2702

to

operate

with

the

AT&T

83B2/83B3

Selective

Calling

Terminal

or

the

Western

Union

Plan

115A

terminal.

Three

speeds

are

available:

45.5

bps

56.9

bps

74.2

bps

Facilities

Telephone

Company

Type

1002

Chan-

nels

or

Western

Union

Class

A

Channels

Telephone

Company

Type

1002

Chan-

nels

or

Western

Union

Class

B

Channels

Telephone

Company

Type

1005

Chan-

nels

or

Western

Union

Class

C

Channels

Telegraph

Terminal

Control

Type

II.

Provides

con-

trols

for

the

attachment

of

Telephone

Company

Tele-

typewriter

Exchange

(TWX)

Stations

to

the

2702.

Control

is

point-to-point

over

Common

Carrier

Switched

150

baud

TWX

Service.

Transmission

speed

is

110

bps.

Terminal

Control

Expansion.

Required

if

both

IBM

and

Telegraph

terminals

are

to

be

attached

to

the

same

2702.

Additional

Selective

Speed

Feature.

Provides

ability

to

add

an

additional

selective

speed

with

IBM

Ter-

minal

Control

Type

I,

Telegraph

Terminal

Control

Type

I,

and

World

Trade

Telegraph

Terminal

Con-

trol.

This

feature

allows

one

terminal

control

as-

signable

within

a 2702

to

operate

different

lines

at

an

additional

line

rate

(speed).

For

example,

IBM

Terminal

Control

Type

I

could

operate

IBM 1050,

1060,

and/or

1070

terminals

at

134.5

bps

and

1070

terminals

at

600

bps

on

the

same

2702,

but

not

on

the

same

communications

line.

Up

to

two

Additional

Selective

Speed

features

can

be

associated

with

one

terminal

control,

allowing

it

to

handle

three

speeds.

The

Additional

Selective

Speed

feature

can

be

associ-

ated

with

only

one

terminal

control.

World

Trade

Telegraph

Terminal

Control.

Enables

the

2702

to

operate

with

various

European

teleprinters

over

single-current

or

double-current

telegraph

lines.

Speeds

are

50

and

75

bps.

(Only

one

speed

may

be

selected

without

an

Additional

Selective

Speedfea-

ture.)

The

World

Trade

Terminal

Control

and

the

Telegraph

Terminal

Control

Type

I

are

mutually

exclusive;

that

is,

either

feature

may

be

chosen

but

not

both.

An IBM 3945

is

required

to

interface

with

the

telegraph

line

adapters

controlled

by

this

terminal

control.

1-4

Remote

Switch

Attachment.

Used

with

a

System/360

Model

65MP

or

Model

67

to

provide

partitioning

and

the

ability

to

attach

the

Two-Processor

Switch

feature

to

the

Multisystem

features

(#4951, #4952) on

the

65MP

or

on

the

2167

Configuration

Unit.

2712 Line

Adapter.

Provides

the

interface

between

the

2702

common

controls

and

the

2712

Modell

or

Model

2

Adapter

feature.

One

is

required

for

each

line

operating

with

the

IBM 2712

Remote

Multiplexer.

IBM 2712

(Models

1

and

2)

Adapter.

These

adapters

are

used

in

conjunction

with

an

IBM 2712

Remote

Multiplexer.

The

Remote

Multiplexer

is

a

freestand-

ing

unit

located

at

the

remote

communications

point.

It

allows

up

to

10

lines

operating

at

134.5

bps

or

14

lines

operating

at

74.2

bps

to

be

bit-multiplexed

onto

one

high-speed

full-duplex

communications

line.

Models

1

and

2

of

the

2712

Adapter

perform

demulti-

plexing

and

bit-multiplexing

of

the

10-line

and

14-line

signals,

respectively.

1032

Attachment

Feature.

Allows

the

IBM 1032

Digital

Time

Unit

to

be

attached

to

line

1

of

the

2702,

provided

an

IBM

Terminal

Control

Type

II, a

Speed

Extension

feature,

and

a

Data

Set

Line

Adapter

or

IBM

Line

Adapter

are

available.

Upon

being

polled,

the

1032

provides

time

data

at

600

bps

(60

cps)

to

the

CPU.

IBM 2741

Break

Feature.

Provides

for

attachment

of

the

IBM 2741

CommuniCations

Terminal

with

Inter-

rupt

feature

in

timesharing

and

other

applications

..

Isolation

Feature.

Allows

power

to

be

turned

on

or

off

in

the

2702

without

generating

spurious

I/O

chan-

nel

signals.

2703

Features

The

2703

does

not

have

anyone

basic

model.

Certain

major

functional

units

of

the

2703

(the

line

base,

line

set,

and

terminal

control)

must

be

ordered

to

fit

the

customer's

line

configuration.

However,

there

must

be

at

least

one

line

base,

line

set,

and

terminal

con-

trol.

The

following

are

the

features

that

are

provided

in

the

2703.

They

are

divided

according

to

line

base,

line

set,

terminal

control,

and

special

features.

Line

Base

Features

Start/Stop

Base

Type

I.

Allows

attachment

to

the

2703

of

up

to

88

half-duplex

lines

operating

at

speeds

up

to

165

bps.

Start/Stop

Base

Type

II.

Allows

attachment

to

the

2703

of

up

to

24

half-duplex

lines

operating

at

speeds

up

to

600

bps.

Synchronous

Attachment.

Allows

attachment

of

synchronous

communications

lines

to

the

2703. A

prerequisite

to

this

feature

is

that

the

Base

Expansion

feature

be

installed.

Synchronous

Base

Type

1A. Allows

attachment

to

the

2703

of

24

half-duplex

lines

using

Synchronous

Ter-

minal

Control

for

EBCDIC

or

USASCII. A

prerequi-

site

to

this

feature

is

the

Synchronous

Attachment

feature.

Synchronous

Base

Type

lB.

Allows

attachment

to

the

2703

of

16

half-duplex

lines

using

Synchronous

Ter-

minal

Control

for

6-Bit

Transcode.

A

prerequisite

to

this

feature

is

the

Synchronous

Attachment

feature.

Base

Expansion.

Allows

attachment

of

a

Synchronous

Attachment

feature

or

more

than

one

Start/Stop

Base

Type

I

or

Type

II

feature

to

the

2703. Only

one

Base

Expansion

feature

can

be

used

at

one

time.

Terminal

Control

Features

IBM

Terminal

Control

Base.

Allows

attachment

to

the

2703

of

an

IBM

Terminal

Control

Type

I

and/or

Type

II

feature.

A

prerequisite

to

this

feature

is

the

Start/Stop

Base

Type

I

feature.

IBM

Terminal

Control

Type

I.

Allows

attachment

of

the

IBM 1050, 1060, 1070,

systems

or

the

IBM 2740

and

2741

terminals

to

the

2703. A

prerequisite

to

this

feature

is

the

IBM

Terminal

Control

Base

fea-

ture.

Three

speeds

are

available:

Connection

75

bps

IBM

1050

on

telegraph

lines

134.5

bps

IBM 1050, 1060, 1070, 2740,

or

2741

600

bps

IBM

1070

IBM 2741

Break.

Allows

attachment

of

the

IBM 2741

Communications

Terminal

with

Interrupt

feature.

IBM

Terminal

Control

Type

II.

Enables

the

2703

to

operate

with

the

IBM 1030

Data

Collection

System

at

a

speed

of

600

bps.

Telegraph

Terminal

Control

Base.

Allows

attach-

ment

of

a

Telegraph

Terminal

Control

Type

I

or

Type

II

to

the

2703.

Telegraph

Terminal

Control

Type

I.

Enables

the

2703 to

operate

with

the

AT&T

83B2/83B3

Selective

Calling

Terminal

or

the

Western

Union

Plan

115A

terminal.

Three

speeds

are

available:

45.5

bps

56.9

bps

74.2

bps

Facilities

Telephone

Company

Type

1002

Chan-

nels

or

Western

Union

Class

A

Channels

Telephone

Company

Type

1002

Chan-

nels

or

Western

Union

Class

B

Channels

Telephone

Company

Type

1005

Chan-

nels

or

Western

Union

Class

C

Channels

Telegraph

Terminal

Control

Type

II.

Provides

con-

trols

for

the

attachment

of

Telephone

Company

Tele-

typewriter

Exchange

(TWX)

Stations

to

the

2703.

controi

is

point-to-point

over

common

c-arrier

switched

150

baud

TWX

Service.

Transmission

speed

is

110

bps.

Telegraph

Attachment.

Allows

attachment

of

Tele-

graph

Line

Set

feature

to

the

2703.

This

feature

is

required

when

one

or

more

AT&T

83B2/83B3,

Western

Union

Plan

115A, IBM 1050,

or

IBM

2740

Model

2

are

attached

to

the

2703

via

the

Telegraph

Line

Set.

Synchronous

Terminal

Control.

Allows

attachment

of

synchronous

terminals

to

the

2703.

It

is

available

for

communicating

in

three

different

codes:

(1) EBCDIC; (2) USASCII;

and

(3)

SBT.

Station

Selection.

This

feature

is

required

when

one

or

more

lines

are

assigned

to

a

Synchronous

Ter-

minal

Control

that

is

functioning

on a

leased

commu-

nications

line

as

a

terminal

station

or

as

a

combina-

tion

terminal

and

control

station.

Line

Set

Features

Data

Line

Set.

Allows

attachment

of

up

to

eight

lines

of

terminals

(IBM 1030, 1050, 1060, 1070, 2740,

2741,

and

Common

Carrier

TWX

terminals

Model

33/35

type)

using

facilities

such

as

switched

and

leased

telephone

networks,

TWX,

Western

Union

Class

D (180

baud)

and

Class

E

Channels,

and

Telephone

Company

150

baud

Type

1006

Private

Line

Service,

or

for

attachment

of

up

to

eight

lines

to

the

IBM 2711

Line

Adapter

Unit.

Intr

oduction

1-5

Data

Line

Set

Expander.

Permits

attachment

of

up

to

eight

additional

lines

to

the

Data

Line

Set

feature.

IBM

Line

Set

1A.

Allows

attachment

to

the

2703

of

up

to

eight

half-duplex

lines

with

2740/2741

terminals.

Used

for

two-wire

local

use

(up

to

4.75

wire

miles).

IBM

Line

Set

lB.

Allows

attachment

to

the

2703

of

up

to

eight

half-duplex

lines

with

2740/2741

terminals.

Used

for

four-wire

local

use

(up

to

4.75

wire

miles).

IBM

Line

Set

2.

Allows

attachment

to

the

2703 of

up

to

eight

half-duplex

lines

with

IBM

1030's, 1050's,

1060's,

1070's,

2740's

or

2741'so

Used

for

two-wire

local

use

(up

to

8

wire

miles).

Telegraph

Line

Set.

Allows

attachment

of

up

to

eight

lines

via

common-carrier

private-line

telegraph

service--such

as

Telephone

Company

Type

1002

(45.5

and

56.9

bps)

and

Type

1005

(74.2

bps)

Private-

Line

Service,

and

Western

Union

Class

A,

B,

and

C

Channels.

AT&T

83B2/83B3

and

Western

Union

Plan

115A

terminals

at

75

bps

and

IBM 1050

or

2740

Model

2

terminals

can

be

connected

to

the

2703

using

this

feature.

Telegraph

Line

Set

Expander.

Allows

attachment

of

up

to

eight

additional

lines

to

the

Telegraph

Line

Set

feature.

Synchronous

Line

Set.

Allows

attachment

of

up

to

four

synchronous

lines

using

voice-grade

facilities.

Allows

IBM 2701

's

and

IBM

2703's

with

System/360

processors,

or

System/360

Model

20

and

IBM

1130's

with

appropriate

communications

adapters,

and

IBM

2780's

to

be

connected

to

the

2703.

Synchronous

Clock.

Required

when

attachment

of

Western

Electric

Data

Sets

202C1

or

202D1

are

used.

Allows

attachment

to

the

2703 of

up

to

four

such

data

sets.

Special

Features

This

group

of

features

can

be

divided

into

five

classi-

fications:

(1)

Line-Speed

Options;

(2) Auto

Call;

(3) 2712

Attachments;

(4)

Two-Processor

Attach-

ment;

and

(5)

Isolation.

Line

Speed

Options.

These

features

provide

the

attachment

of

the

various

synchronous

and

asynchro-

nous

terminals

with

the

following

speeds:

1-6

Asynchronous

45.5

bps

56.9

bps

74.2

bps

75

bps

110

bps

134

bps

600

bps

Synchronous

600

bps

1200

bps

2400

bps

Autocall.

Provides

the

2703

with

automatic

dialing

capabilities

for

up

to

eight

communications

line

attachments.

2712

Attachment

Features.

These

include:

1.

2712

Attachment--Needed

for

any

2712

lines.

2.

2712

Modell

Adapter--Allows

attachment

of

up

to

eight

2712

Modell

lines.

3.

2712

Modell

Expander--Allows

an

additional

ninth

and

tenth

line

to

the

2712

Modell

Adapter

feature.

4.

2712

Model

2

Adapter--Allows

attachment

of

up

to

eight

2712

Model

2

lines.

5.

2712

Model

2

Expander--Allows

an

additional

ninth

through

fourteenth

2712 Model 2

line.

Two-Processor

Switch

Feature.

Enables

the

2703

to

be

physically

attached

to

the

multiplexer

channels

of

two

System/360

processors.

The

2703

must

be

in

a

neutral

state

for

the

switching

to

occur.

When

in

this

neutral

state,

the

2703

monitors

both

multiplexer

interfaces

and

automatically

switches

and

locks

to

the

first

channel

addressing

any

line

of

the

2703.

The

attached

processor

can

return

the

switch

to

neutral

under

program

control

or

through

a

manual

reset.

Isolation

Control

Unit.

Allows

power

to

be

turned

on

or

off

in

the

2703

without

generating

spurious

I/o

channel

signals.

COMMUNICATIONS

FACILITIES

Figures

1-2

and

1-3

show

the

communic~tions

facili-

ties

used

with

the

2702/2703,

the

data

set

used

for

attachment

of

each

terminal,

the

operating

speed,

and

features

required.

ADDRESSING

As

previously

mentioned,

the

multiplexers

appear

as

control

units

to

the

IBM

I/o

channel

interface.

Up

to

IBM 2702 Technisches Handbuch

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