How to configure the E1 interface of AR1200-S to be working in unframed mode?

Configure the E1-F interface of an AR router to be working in unframed mode:
# If you want to access the transport network through a 2 Mbit/s E1 dedicated line, you can configure the E1-F interface to be working in unframed mode as follows:
display device //Check whether the slot number of the E1T1-F interface card is correct and whether the interface card has been registered properly.
system-view
[Huawei] interface serial 1/0/0 //Enter the view of the interface. You can run the display interface brief command to check the information about the interface.
[Huawei-Serial1/0/0] fe1 unframed //Set the work mode of the interface to unframed mode. The default work mode is framed mode.
[Huawei-Serial1/0/0] fe1 line-termination 75-ohm //You can select 75-ohm coaxial cables or 120-ohm twisted pair cables. Twisted pair cables are used by default. This configuration of cable type is optional. However, the configuration of the interface must be in accordance with that of the peer end (except for the clock).
[Huawei-Serial1/0/0] fe1 clock slave //Set the clock mode to master, slave or system. The default clock mode is slave.
[Huawei-Serial1/0/0] crc 16 //Set the CRC verification mode to CRC-16, CRC-32 or none by setting the value to 16, 32, or none. The default CRC verification mode is CRC-16.
[Huawei-Serial1/0/0] fe1 itf number 4 //Set the number of characters filled between frames on the interface to a value ranging from 0 to 14. The default value is 4.
[Huawei-Serial1/0/0] fe1 itf type 7e //Set the type of characters filled between frames on the interface to 7e or ff. The default type is 7e.
[Huawei-Serial1/0/0] fe1 data-coding inverted //Configure whether to invert data by setting the value to inverted or normal. The default value is normal. Set the value to inverted when the number of error packets increases.
[Huawei-Serial1/0/0] fe1 idlecode 7e //Set the idle code type of the line to 7e or ff. The default value is 7e.
[Huawei-Serial1/0/0] undo fe1 detect-ais //Disable the alarm indication signal (AIS) detection which is enabled by default. If the AIS detection is enabled, the state of the interface cannot be up after loopback is performed on the interface.

Run the display fe1 serial [interface-number] command to check the basic configuration and alarms of the E1-F interface.
Run the display interface serial [interface-number command] to check the status and statistics of the E1-F interface.

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