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Section 4: SG-DVL2A Compatible Line Card
4.1 Switches and LEDs on the SG-DVL2A
Each module of SG-DVL2A has 2 line cards. The LEDs and push button switches on the left side and the upper LCD are
for line card #1. The LEDs and push button switches on the right side and the lower LCD are for line card #2.
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1. Liquid Crystal Display is backlit to help reading in low light level.
2. CARRIER LOST: This LED follows the DSR line inversely (when DSR is high LED is off, when DSR is low LED is on).
3. TX: This LED monitors the outgoing message transmitted and follows TXD.
4. RX: This LED monitors the incoming message received and follows RXD.
5. ACK/FUNCTION button: Press this button to acknowledge an alarm in urgent mode (CPM is in failure). In the normal
mode, this button provides access to the line card menu.
6. ALARM LED: The alarm LED is situated inside the ACK button. It will flash if an alarm is received and it turns off when
the alarm is successfully sent to the master CPM.
7. TROUBLE LED: Turns on when the line card is shut down by the operator. Turns off when the situation returns to normal.
8. SELECT button: In the normal mode, press SELECT has no effect at all. But in the line card menu mode, this button is
used to select the menu. Once a menu is selected, the SELECT button acts to go down to the next item.
9. WATCHDOG LED: Flashing every 4 seconds to monitor the line card operating system.
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-L01-Digital Rec
*Unit in Standby
-L02-Digital Rec
*Unit in Standby
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