Fundamental CT3 Interface Configuration Commands
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Parameter
c-bit: Sets the frame format to C-bit.
m23: Sets the frame format to m23.
Description
Using the frame-format command, you can configure the frame format used by a
CT3 interface. Using the undo frame-format command, you can restore the
default frame format used by the CT3 interface.
By default, the CT3 interface adopts the C-bit frame format.
Example
Set the frame format of the interface T3 1/0/0 to m23.
[3com-T3 1/0/0] frame-format m23
loopback
Syntax
loopback { local | payload | remote }
undo loopback
View
CT3 interface view
Parameter
local: Enables the CT3 interface to perform local loopback.
payload: Places the CT3 interface in an external payload loop. Data passes the
framer in this case and will be looped back after payload is generated.
remote: Enables the CT3 interface to perform remote loopback. Data does not go
through the framer in this case and will be looped back before the payload has
been generated.
Description
Using the loopback command, you can configure the loopback mode of a CT3
interface. Using the undo loopback command, you can disable the CT3 interface
to perform loopback.
By default, loopback is disabled on the CT3 interface.
Loopback is usually used for some special detection. It should not be enabled in
normal working condition.
If a CT3 interface encapsulated with PPP has been set to perform loopback, it is
normal for the state of its link layer protocol to be reported as DOWN.
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