ASM-10/8 Installation and Operation Manual Chapter 2. Installation and Setup
09/10/00 16:26 Installation and Setup 2-5
Table 2-1 ASM-10/8 Internal Jumpers and Switches (Cont.)
Item Jumper Description Values Default Setting
9 PIN 21 Controls the remote digital loopback
activation via the DTE pin 21
EN – The remote
loopback activation from
the DTE enabled
DIS – The remote
loopback activation from
the DTE disabled
EN
10 CHAS GND Controls the connection between the
ASM-10/8 signal ground and the frame
(chassis) ground
CONN – Signal ground
is connected to the
frame ground
DIS – Signal ground is
disconnected from the
frame ground
CONN
Note: Disconnecting the signal ground from the frame ground may render the unit unsafe for connection to
unprotected telecommunication networks in some locations.
11 RCV IMPD Selects receive line impedance 150
300
600
HIGH
150
Note: Set RCV IMPD to 150

Ω

for the master modem and the last modem in the line, and all others to HIGH,
when using ASM-10/8 in multipoint applications.
12 CTS-DLY Selects delay between RTS and CTS.
Refer to Configuration Considerations
below for detailed explanation of the
CTS delay settings.
0 msec
8 msec
64 msec
8 msec
13 Data Rate Selects the data rate 0 – 19.2
1 – 14.4
2 – 9.6
3 – 7.2
4 – 4.8
5 – 3.6
6 – 2.4
7 – 1.2
9.6
14 XMT TIMING Selects the transmit timing signal clock
source
INT CK – Internal clock
EXT CK – External clock
RCV CK – Receive clock
ASYNC – Async mode
INT CK