Chapter 2. Installation and Setup
ASM-20
Installation and Operation Manual
2-4 Electrical Installation 11/4/99 14:09
BAUD RATE
kbps
INT
EXT
RCV
ASY
XMT CLK
CHASS
DIS
CON
RTS-CTS
DLY (ms)
0
9
70
0 - 256
1 - 192
2 - 144
3 - 128
4 - 115.2
5 - 112
6 - 96
7 - 72
8 - 64
9 - 57.6
A - 56
B - 48
C - 38.4
D - 32
E - 28.8
F - 19.2
V54 DIS
EN
DIS
CARRIER
ON
CNTRL
ON
OFF
SW. EN.
LOW
HIGH
EN
DIS
ON
OFF
0 dbm
-6 dbm
150
LOW
EN
DIS
RCV IMPRCV LVL
RLB DTE
RPF. XMT LVL XMT IMP
ALB DTE
150
HIGH
1
2
3
4
5
6
7
8
0
9
A
B
C
D
E
F
ONON
321
OFF
ON
ON
ON OFF
OFF
8
9
10
12
25
11
ON
ONON
STOP BIT
%
LN1 BIT
LN0
J14
J12
J10
J9
SW2
J1 J2 J3
J6
J4
J7 J8
J11
J13
*
SW3
*
J11 -
Only for standalone option
Figure 2-3 PCB Layout Diagram
Warning
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.
Note
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 2-1 specifies the strap selection settings. The jumper and switch
identity numbers correspond to PCB Layout Diagram (see Figure 2-3).
