Digicom SNM15 Operation Manual page 11

SNM15
Frequency tolerance
Tone duration
Control and Warning Devices
The control and warning devices with which SNM 15 is equipped
can be considered as auxiliary devices since the functions played
by these devices are already present in the form of commands and
communication protocol messages.
They are particularly useful in the case of manual calls or loop
tests for the switches.
Controls on the Front Panel
DATA
TEST
Warning Lights on the Front Panel
PWR
C108
C107
C103
C104
C109
C142
LINE
Digicom SpA
: ±1% compared to nominal
frequencies laid down in the CCITT
Q23 recommendation.
: 100 ms ± 5 ms.
answer/calling
loop 2/3
modem being fed
DTR Data terminal ready
DSR Modem ready
TD Transmit data
RD Receive data
DCD data carrier detector
TEST modem in loop
modem connected to the line
Introduction
1.7