ADTRAN 1200212L1, Руководство пользователя

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Chapter 3. Operation
61200212L1-1 DSU IQ User Manual 3-3
To activate a menu item designated by an alpha character rather
than a number, place the cursor on the menu item using the up and
down arrows or press
S
HIFT
and then the letter. The flashing cursor
indicates which parameter is activated. Press
Enter
to select the
item.
LED Descriptions
The DSU IQ has seven LED indicators: RS, CS, TD, RD, CD, ALM,
and TST. These LEDs are identified as follows:
RS: Request to Send
Reflects the status of the RS pin of the DTE interface.
CS: Clear to Send
Reflects the status of the CS pin of the DTE interface.
TD: Transmit Data
This LED is active when the DSU IQ DTE port is transmitting data.
RD: Receive Data
This LED is active when the DSU IQ DTE port is receiving data.
CD: Carrier Detect
This LED is active when frame synchronization is achieved and the
DSU IQ is ready to transfer data.
ALM: Alarm
This LED is active when an alarm condition exists and the physical
connection is lost. Alarm conditions include:
DDS Alarm Conditions
• Open loop on network
• No frame synchronization
• OOS/OOF
Frame Relay Alarm Condition
• Network frame relay signaling state is down
TST: Test
This LED is active when the unit is in test mode.