Can the clock be configured on the E1 interface of an AR router

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The clock can be configured on the E1 interface of an AR router as follows:

1. For E1-F cards, enter the view of the E1-F interface and run the following command:
[Huawei-Serial1/0/0] fe1 clock slave //Set the clock mode to master, slave or system. The default clock mode is slave.

2. For E1-M cards, enter the view of the CE1/PRI interface and run the following command:
[Huawei-E1 1/0/0] clock slave //Set the clock mode to master, slave or system. The default clock mode is slave.

Other related questions:
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.

Can the E1 interface of an AR router interconnect with the Ethernet
The E1 interface of an AR router cannot interconnect with the Ethernet. - 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. It is used in WAN in general. - Ethernet: Ethernet uses the Carrier Sense Multiple Access (CSMA) and Conflict Detection (CD) technologies and runs on cables of multiple types with a speed ranging from 10 Mbit/s to 10 Gbit/s. It is used in LAN in general. As described above, the principles, protocols, and application scenarios of E1 and T1 are different. In addition, E1 or other interface cards equipped with four or eight interfaces use RJ45 interfaces but do not use the Ethernet.

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).

Can the E1 interface of an AR router interconnect with MP-group interfaces
The E1 interface of an AR router cannot interconnect with MP-group interfaces. The network works properly only when the configurations of the interfaces on both interconnected ends are consistent.

Do AR routers support E1 interfaces
E1 interfaces that AR routers support are described as follows: E1 interfaces are configured on E1/T1 cards and can be seen as serial interfaces (currently supported by AR1200/AR2200/AR3200/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.

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