MM710 T1/E1 Media Module LEDs

The T1/E1 Media Module has four LEDs on its faceplate (see Figure 23). Table 198 shows their color and functions. The first three are the standard LEDs, which are under software control.

Figure 23. T1/E1 Media Module LEDs

The supported portion of the LED Control message allows software to change the status of the three standard LEDs on the T1/E1 Media Module faceplate. Power-up and alarm states are the only conditions where hardware sets the state of the LEDs independent of ANGEL firmware control.The exceptions to letting software turn off the LEDs are:

• The board is in reset (RED ALM LED remains on)
• A call is up (YELLOW ACT LED remains on while the E1 line is in-frame and at least one voice/data call is up)
• During board reset initialization testing (GREEN TST LED remains on until initialization testing is complete)

Note: For ISDN operation, the Yellow LED will be turned on if ANY port has an active TDM connection (including the D-channel).

Synchronization

The YELLOW ACT LED on the front of the MM710 Media Module can tell you the status of that module regarding synchronization.

• If the YELLOW ACT LED is solidly on or off, it has NOT been defined as a synchronization source. If it is on, one or more channels is active. If it is an ISDN facility, the D-channel will count as an active channel and will cause the YELLOW ACT LED to be on.
• When the MM710 is driving a clock sync source line to the G700 main clock, the YELLOW ACT LED does not indicate port activity, but instead indicates that the MM710 is the sync source by flashing with a regular 3-second period:
• It is on for 2.8 seconds and flashes off for 200 milliseconds if it has been specified as a sync source and is receiving a signal that meets minimum requirements for the interface.
• If it has been specified as a sync source and is not receiving a signal, or is receiving a signal that does not meet minimum requirements for the interface, then the YELLOW ACT LED will be off for 2.8 seconds and flash on for 200 milliseconds.

T1/E1 Initialization

The T1/E1 Media Module LEDs behave in the following manner during initialization. The Angel provides a visual indication of the Media Module's status through the three faceplate LEDs:

• During initialization the YELLOW ACT LED is held off, while the RED and GREEN LEDs are on during the entire initialization sequence.
• Upon power up or reset, if only the RED ALM LED comes on, the Angel processor is dead or the board is being held permanently in reset.
• Upon completion of the diagnostics and initialization, the GREEN TST LED turns off.
• If the initialization tests fail, the RED ALM LED remains on.
• If the tests all pass, then all LEDs are extinguished until Communication Manager starts using the Media Module.

Operational Control

After successful initialization, the T1/E1 Media Module's LEDs are controlled as follows:

• The Angel lights the YELLOW ACT LED when there is at least one non-idle trunk. If Communication Manager sends a message to drive the clock sync signals, the YELLOW ACT LED indicates this instead of the port busy/idle status.
• The Media Server may independently light and extinguish the three LEDs through downlink LED Control messages, subject to the constraint that it may not turn off a YELLOW ACT LED turned on by the Angel as a result of port activity.
• If the Media Module resets for any reason and is not released from reset, the RED ALM LED lights and the YELLOW ACT and GREEN TST LEDs are held off.