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

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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.

Other related questions:
How to modify the E1 interface of an AR router to unframed mode

MP indicates the Multi-Link Point-to-Point Protocol (MLPPP), in which multiple PPP links are bound together. MP binding is often performed in scenarios where a 2 Mbit/s E1 dedicated line cannot meet the service requirements.
MP interfaces transmit data by packets. AR routers only support the binding of interfaces of the same card.

system-view
[Huawei] interface mp-group 0/0/1 //Create an MP-Group interface and enter the view of the interface.
[Huawei-Mp-group0/0/1] undo discriminator //(Optional) Disable the terminal endpoint identifier negotiation function which is enabled by default. You can disable the function when the interface cannot interconnect with the devices of other manufacturers.
[Huawei-Mp-group0/0/1] ip address 192.168.0.1 24 //You can run the ip address ppp-negotiate command to allow the peer end to allocate the IP address generated through PPP negotiation to the interface.
[Huawei-Mp-group0/0/1] interface serial 2/0/0 //Enter the view of the specified physical interfaces (PPP type)
[Huawei-Serial2/0/0] ppp mp mp-group 0/0/1 //Add the physical interface. You can repeat this step to add multiple interfaces.
[Huawei-Serial2/0/0] restart //Restart the related physical interfaces.

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

How to connect the E1 interface of an AR router to other devices using cables
Methods of connecting the E1 interface of an AR router to other devices using cables are described as follows: Devices of operators provide the BNC connector in general while AR routers provide the DB9 female connector (cards with 1 interface or 2 interfaces) or the RJ45 connector (cards with 4 or 8 interfaces). The connection methods are as follows: - BNC connectors of operators' devices -- connectors of coaxial cables -- (BNC connector on the customer end -- E1 cables -- DB9 male connectors) -- DB9 female connectors of routers - BNC connectors of operators' devices -- connectors of coaxial cables -- (BNC connector on the customer end -- E1 cables -- RJ45 connectors) -- RJ45 connectors of routers Cables with BNC and DB9/RJ45 connectors are used.

How to configure a sub-interface on an AR router
A sub-interface is a virtual interface configured on a physical interface. It is generally used for the communication between a physical link and multiple remote ends. Sub-interfaces include: Ethernet sub-interfaces, Eth-Trunk sub-interfaces, PON sub-interfaces, ATM sub-interfaces, and FR sub-interfaces. Configure a sub-interface as follows: [Huawei] interface ethernet 2/0/0 [Huawei-Ethernet2/0/0] undo portswitch //Switch the current interface to a Layer-3 interface. [Huawei-Ethernet2/0/0] quit [Huawei] interface ethernet 2/0/0.1 //Enter the view of the sub-interface.

How to configure the E1-F interface of an AR router to be working in framed mode
Configure the E1-F interface of an AR router to be working in framed mode: # You can configure the E1-F interface to be working in framed mode if you need a lower-speed E1 channel (such as 512 kbit/s) to transmit service data. 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] undo fe1 unframed //Set the work mode of the interface to framed mode, which is the default work mode. [Huawei-Serial1/0/0] fe1 timeslot-list 1-3,8,10 //(Optional) Set the timeslots that need to be bound. Timeslots 1 to 31 are bound by default (the maximum rate of the interface is 1984 kbit/s in this case). [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] fe1 detect-rai //Disable the remote alarm indication (RAI) detection which is enabled by default. 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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