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received - on for a space and off for a mark.
DSU Data Service Unit (DSU) LED lights when the unit is in
the DSU-only mode.
NS The No Signal (NS) LED lights when no signal is
received from the network or when the signal is too
weak for normal operation.
OOS The Out Of Service (OOS) LED lights when an outage
condition occurs. This happens when there is a failure
in the digital service that is detected by the network
and the telco sends a repetitive OOS sequence.
CD The Carrier Detect (CD) LED lights when a carrier
signal is received from the network.
Trunk
CN Congestion (CN) LED lights when congestion is
detected on the trunk.
LK Link (LK) LED blinks slowly when there is no link
management connection with the network. Blinks
quickly when link management is established with the
network. Remains solid ON when the network
indicates the PVC is active.
CD Carrier Detect (CD) LED lights when a carrier signal is
detected from the network.
TD Transmit Data (TD) LED blinks when data is being
transmitted - on for a space and off for a mark.
RD Receive Data (RD) LED blinks when data is being
received - on for a space and off for a mark.