# CX 2000C status indicator LEDs

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

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.
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) | Reserved for future use.

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