What are the differences between the E1 interface and the serial interface of an AR router

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The differences and relationship between the E1 interface and the serial interface of an AR router are described as follows:

The serial interface of an AR router uses the DB9 female connector. It is the physical implementation of the E1 interface and is used transmit data in lines with 2 Mbit/s and lower bandwidth.

DB9 male connectors used on PCs are also called serial interfaces in some scenarios. However, these interfaces are used only to connect to the console interface of routers for device debugging.

Other related questions:
What are the differences between a channelized E1 interface and an unchannelized E1 interface of an AR router
The differences between a channelized E1 interface and an unchannelized E1 interface of an AR router are described as follows: - An unchannelized E1 interface works as an interface not divided by timeslots, whose bandwidth is 2.048 Mbit/s. - For a channelized E1 interface, all the 31 timeslots can be randomly divided into multiple groups (channel sets). Each group is corresponding to a separated channel whose rate can be calculated as follows: n x 64 kbit/s, in which n ranges from 1 to 31. - For a partially channelized E1 interface, the 31 timeslots can be randomly bundled into a channel whose rate can be calculated as follows: n x 64 kbit/s, in which n ranges from 1 to 31.

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).

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.

How to adjust the serial interface rate of an AR routers
The serial interface rate of an AR router cannot be adjusted. For a serial interface running in DTE mode, you can run the virtualbaudrate command to configure the virtual baud rate of the serial interface in synchronous mode. For a serial interface running in DCE mode, you can run the baudrate command to configure the baud rate of the serial interface in synchronous mode. The baud rate determines the transmission rate of a line. Supported baud rate range varies with cable types. ? V.24DCE: 1200 bit/s - 64000 bit/s Baud rate ranges supported by V.35DCE, RS449DCE, and RS530DCE are described as follows: - The baud rate supported by 1SA/2SA interface cards ranges from 1200 bit/s to 2048000 bit/s. - The baud rate supported by 8SA interface cards ranges from 1200 bit/s to 8192000 bit/s. - The baud rate supported by the serial interface of AR2202-48FE ranges from 1200 bit/s to 8192000 bit/s. Supported virtual baud rate range varies with cable types. ? V.24DTE: 1200 bit/s - 64000 bit/s Virtual baud rate ranges supported by V.35DTE, X.21DTE, RS449DTE, and RS530DTE are described as follows: - Virtual baud rate supported by 1SA/2SA interface cards ranges from 1200 bit/s to 2048000 bit/s. - Virtual baud rate supported by 8SA interface cards ranges from 1200 bit/s to 8192000 bit/s. - Virtual baud rate supported by the serial interface of AR2202-48FE ranges from 1200 bit/s to 8192000 bit/s. Ensure that the baud rate configured on the DCE device (by running the baudrate command) is in accordance with the virtual baud rate configured on the DTE device (by running the virtualbaudrate command). Otherwise, packets may be discarded.

Check the status of the E1 interface on the AR router
Check the status of the E1 interface on the AR router as follows: Run the display controller [ e1 [ interface-number ] ] command to check the information about the CE1/PRI interface, or run the display fe1 serial interface-number command to check the basic configuration and alarms of the E1-F interface. display controller e1 1/0/0 E1 1/0/0 current state : UP //Indicates that the state of the interface is Up. Description: HUAWEI, AR Series, E1 1/0/0 Interface Basic Configuration: //The following parameters must be consistent with those of the peer end (except for the clock) Work Mode is E1 Framed, Cable type is 120 Ohm balanced. //The work mode is E1, and the cable type is 120ohm twisted pair cable. Frame-format is NO-CRC4, Line Code is Hdb3. //The frame format is NO-CRC4, and the line code is Hdb3. Source Clock is Slave, Data-coding is Normal. //The clock status is slave, and the clock signal is not inverted. Idle code is 7E, Itf type is 7E, Itf number is 4. //The idle code and the type of characters filled between frames are 7e, and the number of characters filled between frames is 4. Loopback is Not Set. Alarm State: Receiver alarm state is Loss-of-Frame. Transmitter is sending remote alarm. Historical Statistics: //Perform error packet statistics. If the number of error packets increases, you can invert the clock. Data in current interval (0 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Total Data (last 24 hours): 0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

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