Command Reference Guide

3Com Router 5000 Family and Router 6000 Family clock (Serial Interface) ● 49
Command Reference
Working as DTE, the synchronous serial interface must accept the clock provided by
the remote DCE. As transmitting and receiving clocks of synchronization devices are
independent, the receiving clock of a DTE device can be either the transmitting or
receiving clock of the DCE device. So is the transmitting clock. Therefore, there are
four clock options are available for a DTE device.
The following table gives the four clock selection options
In the table, the clock ahead of = is the DTE clock and the one behind is the DCE
clock
Table 1 Clock options available for a synchronous serial interface working as DTE
Clockk selection option Description
DTEclk1 TxClk = TxClk, RxClk = RxClk
DTEclk2 TxClk = TxClk, RxClk = TxClk
DTEclk3 TxClk = RxClk, RxClk = TxClk
DTEclk4 TxClk = RxClk, RxClk = RxClk