How to configure the CE1/PRI interface of an AR router to be working in E1 mode

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You can configure the CE1/PRI interface of an AR router to be working in E1 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 e1 //Configure the CE1/PRI interface to be working in E1 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] 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] undo detect-ais //Do not perform the alarm indication signal (AIS) detection on the current interface. This is an optional configuration which is mandatory for E1 interfaces. The configuration 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.

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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