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MT56DSU-R Owner's Manual
4.2.7
RTS Indicator
The RTS LED lights when the RTS signal is received from the DTE.
The DIP switch for RTS Forced On does not affect this indicator.
Refer to Chapter 2 for switch settings.
4.2.8
NS Indicator
The NS (No Signal) LED lights when no signal at all is received from
the network, or when the signal is too weak for normal MT56DSU-R
operation. This indicator will also flash to indicate that errors have
been detected when using the Test Pattern diagnostic feature.
4.2.9
TM Indicator
The TM (Test Mode) LED lights when one of the Test switches is set
to the down (Test enabled) position. When the TM LED is lit, normal
operation (network transmit/receive) cannot occur. Refer to the
Diagnostic Tests section for more information.
4.2.10
OOS Indicator
The OOS (Out of Service) LED lights when an outage condition
exists. This occurs when there is a failure in the digital service
detected by the network, and the telco sends a repetitive OOS
sequence.
If this indicator is on , check the remote DSU for proper installation
and operation. If the remote DSU is installed and operating correctly,
then report the Out-Of-Service condition to the telephone company.
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