# CX 2000C status indicator LEDs

As shown in the following illustration, the CX 2000C has LEDs located on its end bracket:

CX 2000C LEDs

The following table describes each LED:

LED | Description
--- | ---
Application | Indicator that is optionally controlled by the application.
Ring Voltage | LED on verifies that a ring signal is available to the board.
Low Battery | LED on verifies -30 V DC is available to the board.
High Battery | LED on verifies -48 V DC is available to the board.
BLOCATE | Not used.
All Ports Idle | LED on indicates all circuits are idle on the board. This indicates that the board may be hot swapped without impacting a connected call.
Rear Board In | LED on indicates that a rear transition board is installed.
DSP Active | The blink rate of this LED indicates whether the CPU is active: Blink rate CPU status 1 second cycle Active > 1 second cycle No clock signal After the board is inserted, all LEDs are on momentarily. If this LED stays on after you boot the board, the DSP is halted.
Hot Swap LED (blue) | Illuminated when it is safe to remove the CX 2000C board from the system. The LED illuminates under one of the following conditions: If the board is fully inserted when the backplane is powered up, the blue LED momentarily flashes. This is a normal part of the initialization process. After opening the handles (during the extraction process), the LED illuminates to indicate that it is safe to remove the board. Do not remove the board until the LED illuminates. This occurs only if Hot Swap software is present. If the LED remains illuminated during insertion of a board, the board failed to successfully perform its primary hardware initialization. While it is safe to remove the board, this condition indicates a problem. For more information about Hot Swap, refer to the NMS OAM System User's Manual.

When the board is not configured, all LEDs are ON.