RAD Data comm ASM-20 PCB Layout Diagram, X.21, one of the modems should be set to RCV clock

Chapter 2. Installation and Setup ASM-20Installation and Operation Manual

HAS S

CO N

DIS

T IM P

15 0

LO W

J 13

C

J 14

X M

R CV IM P

1 50

H IG H

J 10

M T LVL

0 d bm

-6 d bm

J 12

X

RC V LVL

LO W

HIG H

R PF.

O N

O FF

J 9

J 11 *

R LB D TE

AL B DTE

EN

D IS

EN

DIS

J 7

J 8

3

4 5

6

E

2

B AU D R AT kbps

4 - 115 .2 5 - 112

9 - 57 .6

C - 38 .4

E - 2 8 .8

F - 19 .2

1

7

0 - 256

1 - 192

2 - 144

3 - 128

6 - 96

7 - 72

8 - 64

A - 5 6

B - 4 8

D - 32

0

8

9

F E D C B A

S W 3

%

12

2 5

BIT P TO S

O N

3

B IT

8 9

1 0

11

S W 2

ON

2

LN 1

O F F

O F F O N O N

O N

1

L N0

O F F

O N

O N

CAR RIER

C NTRL

XM T CL K

J 6

V 54 D IS

EN

DIS

O N

IN T E X T R C V A S Y

0 9 70

RTS -C TS D LY (m s)

SW . E N .

O N

O FF

J 1

J 2

J 3

J 4

*J11 - Only for standalone option

Warning

Note

Figure 2-3 PCB Layout Diagram

In certain locations where permanent excessive high voltages are present on the lines, disconnecting the signal ground from the chassis ground may render the unit unsafe for connection to unprotected telecommunication networks.

For applications using an X.21 interface external clock (DTE timing source), connect the input clock to Pins 7(a) and 14(b) of the 15-pin connector.

In X.21, one of the modems should be set to RCV clock.

Table 2-1specifies the strap selection settings. The jumper and switch identity numbers correspond to PCB Layout Diagram (see Figure 2-3).

2-4 Electrical Installation