Specifications

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.