How to modify the E1 interface of an AR router to unframed mode

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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.

Other related questions:
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.

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.

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

How to configure the E1-IMA interface of an AR router
The configuration method of the E1-IMA interface of an AR router is described as follows: You can configure the attributes of the E1-IMA interface if you want to use a single E1-IMA link to bear ATM cells. system-view [Huawei] interface atm 2/0/0 //Enter the view of the E1-IMA interface. [Huawei-Atm2/0/0] clock slave //Set the clock mode to master or slave. The default clock mode is slave [Huawei-Atm2/0/0] frame-format no-crc4-adm//Set the frame format of the interface to CRC4-ADM or No-CRC4-ADM. The default frame format is NO-CRC4 ADM [Huawei-Atm2/0/0] scramble //Enable the load scrambling function of the E1-IMA interface [Huawei-Atm2/0/0] loopback { local | payload | remote } //Configure the loopback method of the E1-IMA interface. The loopback function is disabled by default. The local method indicates that the loopback is performed in the output direction of the device to test whether the local device works properly. The payload method indicates that the loopback is performed on the valid payload in the output direction of the device. The TS0 is not included in the loopback in general. The remote method indicates that the loopback is performed on the input data stream sent by the peer device to test whether the links between the test devices work properly. Run the display interface atm [ interface-number ] command to check the configuration and status of the ATM interface.

Description of the E1 interface of an AR router
1. E1/T1: E1/T1 is a technology of using the synchronous time division multiplexing technology to combine multiple audio channels into a 2 Mbit/s or 1.5 Mbit/s high-speed channel. - Maximum rate of E1 cards: 32 (timeslots) x 64 (kbit/s per timeslot) = 2048 kbit/s - Maximum rate of T1 cards: 24 (timeslots) x 64 (kbit/s per timeslot) = 1536 kbit/s - CE1/CT1 cards can determine multiple groups of timeslots and have the Controller view. However, E1 cards can determine only one group of timeslots in the framed mode (other timeslots cannot be used). 2. E1 interfaces are configured on E1/T1 cards and can be seen as serial interfaces (currently supported by AR1200(S)/AR2200(S)/AR3200(S)/AR3600). - 1E1T1-M/2E1T1-M support the E1/CE1/CT1/PRI(E1&T1) interface. - 4E1T1-M/8E1T1-M support the E1/CE1/PRI(E1) interface. - 1E1T1-F/2E1T1-F support the framed/unframed E1/T1 interface. - 4E1T1-F/8E1T1-F support the framed/unframed E1 interface. - The character M in a model name indicates Multiflex Trunk, that is, the model can be fully channelized. The character F in a model name indicates Fractional, that is, the model can be partially channelized. 3. The CE1/PRI interface is the physical interface of the E1 system. It can work in E1 mode (unchannelized mode) or CE1/PRI mode (channelized mode). - In E1 mode, the CE1/PRI interface works as an interface not divided by timeslots, whose bandwidth is 2.048 Mbit/s. - In CE1/PRI mode, the 2M line is divided into 32 timeslots of 64 KB, which are numbered from 0 to 31. Timeslot 0 is used to transfer frame alignment information. a. CE1 interface: All timeslots except timeslot 0 are randomly divided into multiple groups (channel sets). Each group is corresponding to a separated channel. b. PRI interface: Bundle timeslot 16 (D channel) and any one of timeslots 1 to 15 or 17 to 31 (B channel) into a group (PRI set). c. CE1 interfaces can be divided into multiple groups. However, only one group can be bundled for PRI interfaces. 4. The CT1/PRI interface is the physical interface of the T1 system. - CT1 interface: All timeslots (timeslot 1 to 24) can be randomly divided into multiple groups. Timeslots in each group are bundled into a channel set. - PRI interface: Randomly bundle timeslot 24 (D channel) and any one of timeslots 1 to 23 (B channel) into a group (PRI set). - CT1 interfaces can be divided into multiple groups. However, only one group can be bundled for PRI interfaces. 5. E1 interfaces, channel sets, and PRI sets can all be seen as serial interfaces, which have the same logical characteristics as synchronous serial interfaces and support IP network protocols and protocols in the data link layer, such as PPP and HDLC frame relay X.25 protocol (PRI sets do not support the HDLC frame relay X.25 protocol and channel sets of CT1 interfaces do not support the X.25 protocol).

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