# Verifying trunk connections

Complete the following steps to verify that the board is working correctly:

Step | Action
1 | Set the following keyword values in the board keyword file: Clocking.HBus.ClockSource = OSC Clocking.HBus.ClockMode = STANDALONE
2 | Use the oamsys command to boot the board.
3 | Run the digital trunk monitor utility, trunkmon. This utility monitors alarms and gathers performance statistics for T1 and E1 trunks. A red trunk LED indicates an alarm state when trunkmon detects a local or remote loss of frame or excessive bit errors. If no T1/E1 trunk cables are connected to the CG 6565E board, trunkmon shows a loss of frame and an alarm state on all trunks. The red alarm LED on the end bracket lights up for all trunks. Refer to the Dialogic® NaturalAccess™ OAM System Developer’s Manual for information about trunkmon.
4 | Connect a crossover cable between any two trunks of the CG 6565E board. The Frame Sync status changes to OK and the red/yellow LEDs go out. The remote alarm (yellow) LEDs light up to show that the trunk is indicating an alarm state to the other side. About 15 seconds (for T1 trunks, immediately for E1 trunks) after frame synchronization has been acquired, both trunks leave the alarm state. trunkmon indicates NONE for the alarm status and the yellow/red alarm LEDs go out.