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Figure 1-2

DVII

Communications

Multiplexer

Parity

Generation and Detection

Odd,

Even,

or

None

Modems Accommodated

Synchronous

modems

(Bell System 201, 208,

209,

or

equivalent)

Asynchronous

modems

(Bell System 202 series,

103

series

or

equivalent)

Bus Loading

Two

PDP-II

Unibus

Loads

Protocols Implemented

The

DV

II

specifically implements

(but

is

not

limited to) Digital's

DDCMP

and

IBM's

BIS-

YN

C protocols.

Maximum Throughput

38,400

characters/second

1-5

Sync

Character

Facility

Synchronization

of

a line

can

be selected

to

be

on

the basis

of

the

receipt

of

either

one

sync

character

or

two

consecutive, identical sync

characters.

For

each 4-line

group,

two

sync

codes

may

be

manually preset in switches.

The

PD

P-II

program

may select either

of

those

two

sync codes for use

on

a selected line.

NOTE

Since the

DVll

requires

21

A

of

+5

V power, only

three

DVl1s

can"e

placed on a typicaI21-in. expander

box. Expander boxes

usually contain three H744 regu-

lators, each

of

which has a capacity

of

25 A. A device

cannot be powered partially from one regulator and

partially from another regulator; the number

of

DVl1s

must equal the number

of

regulators. Therefore, three

DVlls

is the maximum for one expander box.