ADTRAN DSU III TDM Manual page 42

Chapter 3. Operation
RS: Request to
Send
CS: Clear to
Send
TD: Transmit
Data
RD: Receive
Data
CD: Carrier
Detect
ALM: Alarm
Indication
TST: Test Mode
3-12
Reflects the status of the request to send pin of the
EIA-232 connector for the currently selected port.
Reflects the status of the clear to send pin of the EIA-
232 connector for the currently selected port.
This LED is active when the multiplexer transmits
data to the DTE on the currently active port.
This LED is active when data is received from the
DTE on the currently active port.
This LED is active when the multiplexer achieves
frame synchronization and is ready to transfer data.
This LED is active whenever an alarm condition
exists. Alarm conditions include:
• Open loop on network
• No frame synchronization
• Unit in dial backup
• Problem on dial backup line
This LED is active whenever the unit is in test mode.
DSU III TDM User Manual 61200063L1-20