3Com 10014299 manual Inversion is disabled by default, Select work clock, Set clock inversion

126CHAPTER 10: CONFIGURING WAN INTERFACE

DTE1

DTE2

DTE3

DTE4

TxClk = TxClk, RxClk = RxClk

TxClk = TxClk, RxClk = TxClk

TxClk = RxClk, RxClk = TxClk

TxClk = RxClk, RxClk = RxClk

TxClk stands for transmitting clock, RxClk for receiving clock, the clock before “=” is DTE-side clock, and that behind “=” is DCE-side clock.

Please use the following commands in the view of the synchronous serial interface.

Table 115 Select work clock

Operation	Command
Select DCE-side synchronous serial interface	clock	dceclk
clock
Select DTE-side synchronous serial interface	clock	{	dteclk1 dteclk2
clock.	dteclk3		dteclk4 }

The clock of DCE-side synchronous serial interface is dceclk by default, and that of DTE side is dteclk3 by default.

7Set clock inversion

In some special cases, the clock will generate half-period delay on the line, which may cause failed interconnection of equipment at two ends or large amount of messages discarded. In this case, the transmit clock signal of DTE-side synchronous serial interface can be inverted to eliminate the influence of delay.

Please use the following commands in the view of the synchronous serial interface.

Table 116 Set clock inversion

Operation	Command
Enable the inversion of transmit clock signal of	invert transmit-clock
DTE-side synchronous serial interface
Disable the inversion of transmit clock signal of	undo invert transmit-clock
DTE-side synchronous serial interface

The inversion is disabled by default.

This command is only effective to certain clock signals provided by some DCEs. Usually, clock inversion should not be set.

8Enable or disable level detection

By default, when the system decides whether the synchronous serial interface is in UP status or DOWN status, it detects the DSR signal, DCD signal and whether the interface connects a cable at the same time. Only when the three signals are effective, will the system regard the interface is in UP status, otherwise, in DOWN status. If level detection is disabled for the synchronous serial interface, the system will not detect the DSR signal.

Please use the following commands in the view of the synchronous serial interface.

Table 117 Enable or disable level detection for the synchronous serial interface

Operation

Command