User manual

ASM-20 Installation and Operation Manual Chapter 2 Installation and Setup
Setting Internal Jumpers and Switches 2-3
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 2-1. 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 2-1 specifies the strap selection settings. The jumper and switch identity
numbers correspond to PCB Layout Diagram (see Figure 2-1).
Warning
Note