# 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. trunkmon monitors alarms and gathers performance statistics for T1 and E1 trunks. On a T1 trunk, an alarm state is indicated by the red, yellow, or blue LEDs. On an E1 trunk, the board indicates an alarm state when it detects a local or remote loss of frame, or excessive bit errors. If no T1/E1 trunk cables are connected to the CG 6060C board, trunkmon shows a loss of frame synchronization (Frame sync: No Frm) and an alarm state on all trunks. The green LEDs for all trunks on the front panel blink. Refer to the Dialogic® NaturalAccess™ OAM System Developer’s Manual for more information about trunkmon.
4 | Connect a crossover cable between any two trunks of the CG 6060C board. The Frame Sync status immediately changes to OK. The green LEDs for those trunks light continuously after frame synchronization has been acquired. Both trunks then leave the alarm state. trunkmon indicates NONE for the alarm status.