3Com 3032 Configuration Manual page 130

126 C 10: C
HAPTER ONFIGURING
WAN I
NTERFACE
DTE1
DTE2
DTE3
DTE4
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
Select DCE-side synchronous serial interface
clock
Select DTE-side synchronous serial interface
clock.
The clock of DCE-side synchronous serial interface is dceclk by default, and that of
DTE side is dteclk3 by default.
7 Set 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
Enable the inversion of transmit clock signal of
DTE-side synchronous serial interface
Disable the inversion of transmit clock signal of
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.
8 Enable 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
TxClk = TxClk, RxClk = RxClk
TxClk = TxClk, RxClk = TxClk
TxClk = RxClk, RxClk = TxClk
TxClk = RxClk, RxClk = RxClk
Command
clock dceclk
clock { dteclk1 | dteclk2 |
dteclk3 | dteclk4 }
Command
invert transmit-clock
undo invert transmit-clock
Command