How to configure the CE1/PRI interface of an AR router to be working in PRI mode

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You can configure the CE1/PRI interface of an AR router to be working in PRI mode as follows:
# Configure the IE1T1-M/2E1T1-M interface card to be working in CE1/PRI mode.
display device//Check whether the slot number of the E1T1-M interface card is correct and whether the interface card has been registered properly.
system-view
[Huawei] controller e1 1/0/0 //Enter the view of the specified CE1/PRI interface.
[Huawei-E1 1/0/0] using ce1 //Configure the CE1/PRI interface to be working in CE1/PRI mode. The CE1/PRI interface works in CE1 mode by default. The system automatically creates a serial interface xx:0. You can run the display interface brief command to check the information about the created interface.
[Huawei-E1 1/0/0] pri-set timeslot-list 1,5-8,16 //Bind the timeslot 1, timeslots 5 to 8, and timeslot 16 of the CE1/PRI interface 1/0/0 into a pri-set.
[Huawei-E1 1/0/0] line-termination 75-ohm //You can select 75-ohm coaxial cables or 120-ohm twisted pair cables. Twisted pair cables are used by default. You can directly use twisted pair cables on 4-interface and 8-interface cards.
[Huawei-E1 1/0/0] frame-format crc4 //Set the frame format of the interface to CRC4 or NO-CRC4. The frame format is NO-CRC4 by default and can be modified. The frame format of the interface must be in accordance with that of the peer end (except for the clock).
[Huawei-E1 1/0/0] 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-E1 1/0/0] itf type 7e //Set the type of characters filled between frames on the interface to 7e or ff. The default type is 7e.
[Huawei-E1 1/0/0] 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-E1 1/0/0] idlecode 7e //Set the idle code type of the line to 7e or ff. The default value is 7e.
[Huawei-E1 1/0/0] detect-rai //Perform the remote alarm indication (RAI) detection which is enabled by default.

Run the display controller e1 [interface-number] command to check the status and parameters of the CE1/PRI interface.
Run the display interface serial [interface-number] command to check the status and statistics of the corresponding serial interface.

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