38
LDM-MR19.2
Table 5-1. Controls
ITEM
CONTROL
FUNCTION
A
DIG
Pressng the Digital Loopback button causes the local LDM-MR19.2
to loop received data and clock to its transmitter. Data Set Ready
goes low.
B
ANA
Pressing the Analog Loopback (V.54 Loop) button causes the local
LDM-MR19.2 to loop its transmitter output back to its receiver. This
loopback can also be activated from the terminal when the Pin 18
strap (strap #9) is set to EN (see
Section 3.4
).
C
REM
Pressing the Remote Digital Loopback (V.54 Loop 2) button causes
the remote LDM-MR19.2 to loop received data and clock to its
transmitter. Data Set Ready goes low. This loopback can also be
activated from the terminal when the Pin 21 strap (strap #10) is set to
RLB EN (see
Section 3.4)
.
D
RPF
ME760C only:
Turn OFF the RPF LED and reset the RPF circuitry (see
Section 5.4
).
Table 5-2. Indicators
ITEM
INDICATOR
CCITT V.24
FUNCTION
CIRCUIT
1
PWR
Green LED is ON when power is present.
2
RTS
105
Yellow LED is ON when DTE activates
Request to Send.
3
TD
103
Yellow LED is ON when steady SPACE is being
transmitted. It flickers when data is transmitted.
4
RD
104
Yellow LED is ON when steady SPACE is being
received. It flickers when data is received.
5
DCD
109
Yellow LED is ON when a valid Receive signal
is present.
6
TEST
142
Red LED is ON when the LDM-MR19.2 is in any
of the three loopback modes.
7
RPF
N/A
ME760C only:
Red LED is ON when the local card
detects a power-fail tone from the remote standalone.
