3Com 10014299 manual Set frame format for an E1-F interface, Display and debug E1-F interface

142 CHAPTER 10: CONFIGURING WAN INTERFACE

Table 153 Set frame format for an E1-F interface

Operation	Command
Set frame format for an E1-F interface	fe1 frame-format { crc4
	no-crc4 }
Restore the default frame format of the E1-F	undo fe1 frame-format
interface

By default, the frame format of E1-F interface is no-CRC4.

7Enable or Disable Local Loopback/Remote Loopback

An interface should be place in local loopback or remote loopback for some special functionality tests.

Perform the following configuration in E1-F interface view.

Table 154 Enable/Disable local/remote loopback on an E1-F interface

Operation	Command
Enable local/remote loopback on an interface	fe1 loopback { local remote }
Disable local/remote loopback on an interface	undo fe1 loopback [ local
	remote ]

By default, no E1-F interface is placed in local or remote loopback.

On an interface, using this command but with different arguments can respectively enable local loopback and remote loopback, but these two functions cannot be enabled at the same time.

Display and Debug E1-FPerform the display command in all views to display the state of E1-F interface Interface and other related information.

Table 155 Display and debug E1-F interface

Operation	Command
Display configuration and state of E1-F interface	display fe1 [ serial
	serial-number ]
Display the operating state of E1-F interface	display serial serial-number