FTP数据上传问题求助

[thzhr]

基于4G模块的TCP测试FTP功能，数据下载正常。数据上传没有成功：

[10:07:58.850]收
+QIURC :
recv,1,21
230 1ser logged in.
AT +QISEND=1,8
SEKD OK
[10:07:58.979]收<recv ，1，20+QTURC :200 Type set to .
AT +QISEHD=1,6
SEHD OK
[10:07:59.089]收-+QIURC :recv ，1，49227 Entering PassiveMode(192,168,0,106,8,74)
A紺➎另驸 +QICLOSE-2OKAT+QIOFEH=1,2,"TCP","59.37.162.9”,2122,0,10K
[10:07:59.220]收-+QTOPEH:2.0
[10:08:05.721]收-◆AT+QISEKD=1,21
SEHD OK
[10:08:05.809]收-+QIURC :recv ,1,54125 Data cornection already open: Transfer starting
[10:08:14.602]收-◆AT+QISEND=2,13
SEHD OK
[10:14:33.270]收-HOT1RC:822601
425 Data charnel timed out due to not meeting the minimum bandwidth requirement
+QIURC :closed”,2
[10:16:42.539]收-+QIURC elosed ，1

FTP服务器上可以看到上传文件名创建成功，但是大小为零，数据没有上传成功。

请问这里“425 Data charnel timed out due to not meeting the minimum bandwidth requirement”是什么意思，可能原因？