ES-5211 Rev.7

P. 3 / 4

INSTALLATION INSTRUCTIONS

■LIGHTNING PROTECTION

Long distance transmission system via cables are often

destroyed by inductive surge of lightning. In order to

prevent lightning surges entering through power sup-

ply line and signal line, proper procedure will be

required.

Specify M-System's special lightning ar-

rester M-RESTER for this purpose. Fuses provided by

NTT do not meet to the protecting purpose of transmis-

sion cable.

■CABLE RESISTANCE OF NTT SPECIAL LINE

Check that cable resistance (including return) of the

NTT special line is within 3kΩ. In general, it is around

1kΩ and does not cause any problem.

4

3

1

2

7

8

TMA-S

4

3

1

2

7

8

TMA-R

8

1

4

5

2

MA-100/200

S–

S+

P+

P–

MDP-24-1

G

P–

P+

S+

S–

MDP-24-1

G

+

–

+

–

INPUT

OUTPUT

POWER

+

–

POWER

5

4

1

8

2

MA-100/200

S–

S+

P+

P–

MDP-24-1

G

TELEPHONE LINE

(leased circuit)

FUSE BOX

LEASED CIRCUIT

50 bps

REMOTE

LOCAL

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

+

–

+

–

Isolation

*

Base Socket

S

Z

*Input shunt resistor attached for current input.

INPUT

3

Low Drift

Amplifier

Output

Driver

OUTPUT

R

4

5

6

1

2

U(+)

V(–)

POWER

7

8