Brother International DCP1000 Service Manual - Page 167

WSW20

(Overseas

communications

mode

setting)

Selector

No.

Function

Setting

and

Specifications

1

EP*

tone

prefix

0:

OFF

1:

ON

2

Overseas

communications

mode

(Reception)

0:

2100

Hz

1:

1100

Hz

3

Overseas

communications

mode

(Transmission)

0:

OFF

1:

Ignores

DIS

once.

No.

4

5

4

Min.

time

length

from

reception

of

0 0

:

100

ms

CFR

to

start

of

transmission

of

video

0

1

:

200

ms

5

signals

1

0

:

300

ms

1 1

:

400

ms

No.

6

7

0 0

:

Yes

(When

CNG

goes

either

ON

or

OFF)

6

7

Chattering

noise

elimination

at

detection

of

CNG

:

0

1

Yes

(Only

when

CNG

goes

OFF)

1

0

:

No

1 1

:

No

8

CNG

detection

on/off

0:

OFF

1:

ON

*

EP:

Echo

protection

•

Selector

1:

EP

tone

prefix

Setting

this

selector

to

"1"

makes

the

equipment

transmit

a

1700

Hz

echo

protection

(EP)

tone

immediately

preceding

training

in

V.29

modulation

system

to

prevent

omission

of

training

signals.

Prefixing

an

EP

tone

is

effective

when

the

equipment

fails

to

transmit

at

the

V.29

modem

speed

and

always

has

to

fall

back

to

4800

bps

transmission.

•

Selectors

2

and

3:

Overseas

communications

mode

These

selectors

should

be

used

if

the

facsimile

equipment

malfunctions

in

overseas

communications.

According

to

the

communications

error

state,

select

the

signal

specifications.

Setting

selector

2

to

"1"

allows

the

equipment

to

use

1100

Hz

CED

signal

instead

of

2100

Hz

in

receiving

operation.

This

prevents

malfunctions

resulting

from

echoes,

since

the

1100

Hz

signal

does

not

disable

the

echo

suppressor

(ES)

while

the

2100

Hz

signal

does.

Setting

selector

3

to

"1"

allows

the

equipment

to

ignore

a

DIS

signal

sent

from

the

called

station

once

in

sending

operation.

This

operation

suppresses

echoes

since

the

first

DIS

signal

immediately

follows

a

2100

Hz

CED

(which

disables

the

ES)

so

that

it

is

likely

to

be

affected

by

echoes

in

the

disabled

ES

state.

However,

such

a

disabled

ES

state

will

be

removed

soon

so

that

the

second

and

the

following

DIS

signals

are

not

susceptible

to

data

distortion

due

to

echoes.

Note

that

some

models

when

called

may

cause

error

by

receiving

a

self

-outputted

DIS.

•

Selectors

8:

CNG

detection

on/off

If

this

selector

is

set

to

"1,"

the

equipment

detects

a

CNG

signal

according

to

the

condition

preset

by

selectors

2

and

3

of

WSW18

after

a

line

is

connected.

If

it

is

set

to

"0,"

the

equipment

detects

a

CNG

signal

as

long

as

the

line

is

connected.

24

Brother International DCP1000 Service Manual - Page 167

communications.

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