Universal Serial Port (USP) Line Card
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
T
O CONFIGURE INVERT TRANSMIT CLOCK
When DTE/DCE is using external clock source, long cables at high speed might
introduce phase shift in transmitted data and clock. Clock inversion can reduce
errors by correcting the phase shift.
Note: By default, the transmit clock is not inverted.
E
XAMPLE
ALU(config-if Serial0/0)# invert-txc
ALU(config-if Serial0/0)# no invert-txc
T
O CONFIGURE LOOPBACK
Loopback command can be used for troubleshooting and diagnostic purpose.
When interface is configured in loopback mode, Tx data and Tx clock loop to
internal controller as Rx data and Rx clock. In the same way, Rx data and Rx
clock on line loop out on line as Tx data and Tx clock.
E
XAMPLE
ALU(config-if Serial0/0)# loopback
ALU(config-if Serial0/0)# no loopback
Command (in ICM) Description
invert-txc This command inverts the transmit clock
to correct phase shift between the clock
and the data.
no invert-txc The “no” command sets the clock to
original phase.
Command (in ICM) Description
loopback This command configures an interface in
loopback mode.
no loopback The “no” command removes the
loopback configured on the interface.
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