ASM-20 Installation and Operation Manual Chapter 2. Installation and Setup
11/4/99 14:09 Electrical Installation 2-5
Table 2-1 ASM-20 Strap Selection Settings
Jumper and
Switch Identity
Function Possible
Settings
Factory
Setting
J1
V54 DIS
Prevents activation of remote V.54 loops. EN
DIS
EN
J2
CARRIER
Selects the transmit carrier mode. When ON,
transmit carrier is constantly ON. When CNTRL,
transmit carrier is ON only when RTS is High. In
X.21, RTS is replaced by the CONTROL signal.
ON
CNTRL
ON
J3
XMT CLK
Selects the transmit timing signal from either:
internal clock, external clock or receive clock and
enables working in Asynchronous mode.
INT
EXT
RCV
ASY
INT
J4
RTS-CTS
DLY (ms)
Selects the delay between RTS and CTS. 0
9
70
9 msec
J6
SW. EN.
Enables activation of DIG, ANA and REM
loopbacks via the front panel push buttons.
ON
OFF
ON
J7
RLB DTE
Enables Remote Loopback command from the
DTE.
EN
DIS
EN
J8
ALB DTE
Enables Analog Loopback command from the
DTE.
EN
DIS
EN
J9
RCV LVL
Selects the receiver sensitivity level required. LOW
HIGH
LOW
J10
RCV IMP
Selects receive line impedance. 150Ω
HIGH
150 Ω
J11
RPF*
Enables the Remote Power Failure feature. ON
OFF
ON
J12
XMT LVL
Selects the transmit output level to the line. 0 dBm
-6 dBm
0 dBm
J13
XMT IMP
Selects the transmit line impedance. 150Ω
LOW
150Ω
J14
CHASS
The CON setting connects Signal Ground to
Chassis Ground. The DIS setting disconnects
them.
DIS
CON CON
* Only for standalone option