The bandwidth of the link that connects the synchronization serial port of an AR2200 router and a device of a competitor does not reach 2 Mbit/s

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Problem description: The route of the network can be described as follows: AR2240 (SA interface card)--------Carrier network------------Device of vendor C
The AR router is connected t the device of vendor C, and the nominal bandwidth of the leased link is 2 Mbit/s. However, the actual test bandwidth is only 64 kbit/s, which is far lower than the nominal bandwidth.
Alarm: None
Handling process: When the SA interface card of an AR router works as a DTE device in synchronous mode, its baud rate is 64000 bit/s by default, which needs to be configured by running the virtualbaudrate command based on the actual link bandwidth.
interface serial 1/0/0
link-protocol ppp
clock rc
virtualbaudrate 2048000
ip address 10.1.1.1 255.255.255.252

Modify the virtual baud rate to 2048000 bit/s on the AR router. The bandwidth of the link in the test can reach the actual bandwidth of the leased link.
Root causes:
1. The default interface rate of the synchronous serial port is not modified.
2. The configuration command is not properly run based on the actual use of the device (DTE or DCE).
Suggestion and summary:
When the device is used as a DTE device:
Run the virtualbaudrate command to configure the virtual baud rate of a serial interface in synchronous mode. The virtual baud rate of a serial interface in synchronous mode is 64000 bit/s by default.
When the device is used as a DCE device:
Run the baudrate command to configure the baud rate of a serial interface in synchronization mode. The baud rate of a serial interface in synchronous mode is 64000 bit/s by default.

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