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dteclk3: Sets the interface clock selection mode to DTE clock option 3.
dteclk4: Sets the interface clock selection mode to DTE clock option 4.
dteclkauto: Sets the interface clock selection mode to DTE autonegotiation.
Description Use the
clock command to set clock selection mode for the synchronous serial
interface.
Use the
undo clock command to restore the default.
By default, the DTE-side clock on synchronous serial interfaces is DTE clock option
1 (dteclk1).
A synchronous serial interface can operate as DCE or DTE.
■ As DCE, the interface provides DCEclk clock to the DTE.
■ As DTE, the interface accepts the clock provided by the 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, four clock options are
available for a DTE device.
See Figure 1:
Figure 1 Select a clock for a synchronous serial interface
In the figure, “TxClk” represents transmitting clock and “RxClk” receiving clock.
The following table gives the four clock selection options.
In the table, the clock ahead of the equal sign (=) is the DTE clock and the one
behind is the DCE clock.
Example # Set the synchronous serial interface working as DTE to use the clock selection
option dteclk2.
<Sysname> system-view
[Sysname] interface serial 1/0
[Sysname-Serial1/0] clock dteclk2
Table 16 Clock options available for a synchronous serial interface working as DTE
Clock selection option Description
DTEclk1 TxClk = TxClk, RxClk = RxClk
DTEclk2 TxClk = TxClk, RxClk = TxClk
DTEclk3 TxClk = RxClk, RxClk = TxClk
DTEclk4 TxClk = RxClk, RxClk = RxClk
DCE DTE
TxCl k
RxClk