What do M and F in an 8E1 card name mean

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The meanings of M and F are as follows:
-M: multiflex trunk, which means channelized E1.
-F: fractional, which means fractional channelized E1.

Other related questions:
Can an E1-F card interconnect with an E1-M card
An E1-F card can interconnect with an E1-M card in the following scenarios: - The E1-M card works in E1 mode and the E1-F card works in unframed mode. - The E1-M card works in CE1 mode and the E1-F card works in framed mode. In addition, the E1-M card creates only one channel set, and the timeslots that are bound to the channel on the E1-M card are the same as those on the E1-F card.

Can the E1-F card communicate with the E1-M card
The E1-F card can communicate with the E1-M card in the following scenarios: -The E1-M card works in E1 mode and the E1-F card works in unframed mode. -The E1-M card works in CE1 mode and the E1-F card works in framed mode. Only one channel set is created on the E1-M card and binds the same timeslots as the E1-F card.

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.

Why the state of the interface alternates between Up and Down after an AR+8E1/T1-F card is used to connect to the peer end in the replacement of a Cisco+8E1/T1-F card
This problem occurs because E1-F interfaces support two frame formats when working in framed mode: CRC4 and NO-CRC4. The frame format of E1-F interfaces of Huawei devices is NO-CRC4 by default. However, the frame format of E1/T1-F interfaces of Cisco devices is CRC4 by default. Therefore, after the Cisco card is replaced by the Huawei card, the frame formats on both ends become different, so that the state of the interface alternates between Up and Down after the Huawei device interconnects with the peer end. Before using an E1/T1-F card, run the fe1 frame-format { crc4 | no-crc4 } command to configure the frame format of the E1-F interface, ensuring that the frame formats on both ends are consistent.

Why traffic forwarding fails when interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards are added to an MP-group and the maximum MTU of the interfaces is set to 1596 bytes
After interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards are added to an MP-Group, the interfaces add a 4-byte MP packet header to a 1596-byte IP packet before sending it. As a result, the total packet length exceeds the maximum MTU of the interfaces, 1596 bytes. Consequently, traffic forwarding fails. In this scenario, you are advised to set the MTU of the interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards to 1592 bytes.

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