XD命令是GSP的一个诊断和测试的命令，可以检测电源，LAN的状态，测试参数，modem检测，还可以reset GSP .
XD：Diagnostics and/or Reset of GSP
This command allows the user to perform some simple checks to confirm the GSP's health and it's connectivity status.
The following tests are availiable:
1.Parameters checksum
2.I2C bus test
3.LAN connectivity test using "Ping"
4.modem self-tests
Also,the GSP can be reset from this command by type R.A GSP reset can be safely performed without affecting the
operation of the server.