3G上网卡显示虚拟串口
中兴AC580插入USB口后，虚拟串口循环的断开、连接，我猜测是CD-ROM没有退出，但不知道怎么做，请高人指点下，谢谢！
以下是打印信息：
bash-3.2# usb 1-1: new full speed USB device using fsl-ehci and address 2
usb 1-1: configuration #1 chosen from 1 choice
usb 1-1: USB disconnect, address 2
usb 1-1: new full speed USB device using fsl-ehci and address 3
usb 1-1: configuration #1 chosen from 1 choice
option 1-1:1.0: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
option 1-1:1.1: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
option 1-1:1.2: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
option 1-1:1.3: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
scsi1 : SCSI emulation for USB Mass Storage devices
scsi2 : SCSI emulation for USB Mass Storage devices
scsi 1:0:0:0: CD-ROM ZTE Corp USB Storage 2.31 PQ: 0 ANSI: 2
scsi 2:0:0:0: Direct-Access ZTE Corp USB Storage 2.31 PQ: 0 ANSI: 2
sd 2:0:0:0: [sda] Attached SCSI removable disk
usb 1-1: USB disconnect, address 3
option: option_instat_callback: error -108
option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
option 1-1:1.0: device disconnected
option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
option 1-1:1.1: device disconnected
option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
option 1-1:1.2: device disconnected
option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
option 1-1:1.3: device disconnected
usb 1-1: new full speed USB device using fsl-ehci and address 4
usb 1-1: configuration #1 chosen from 1 choice
usb 1-1: USB disconnect, address 4
usb 1-1: new full speed USB device using fsl-ehci and address 5
usb 1-1: configuration #1 chosen from 1 choice
option 1-1:1.0: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
option 1-1:1.1: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
option 1-1:1.2: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
option 1-1:1.3: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
scsi4 : SCSI emulation for USB Mass Storage devices
scsi5 : SCSI emulation for USB Mass Storage devices
scsi 4:0:0:0: CD-ROM ZTE Corp USB Storage 2.31 PQ: 0 ANSI: 2
scsi 5:0:0:0: Direct-Access ZTE Corp USB Storage 2.31 PQ: 0 ANSI: 2
sd 5:0:0:0: [sda] Attached SCSI removable disk
usb 1-1: USB disconnect, address 5
option: option_instat_callback: error -108
option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
option 1-1:1.0: device disconnected
.......

------解决方案--------------------
Modem一般是USB接口或者串口的，由于历史原因，USB接口一般会转成虚拟串口。
你的情况是要么modem有问题，要么驱动有问题。USB modem的驱动是开源的比较稳定，怀疑硬件接触不良，硬件问题的可能性比较大。
------解决方案--------------------
你的问题很普遍。
要小工具 usb_modeswitch 1.0.2 切换其倒霉的USB工作状态 。
你 google 一下sb_modeswitch 1.0.2 。