Ubuntu,通过 USB 的电缆调制解调器,速度有限?

Ubuntu,通过 USB 的电缆调制解调器,速度有限?

首先抱歉我的英语不好,我希望你能理解我。

我有一个 Ubuntu 11.04 盒子。有一个通过 USB 插入的电缆调制解调器(摩托罗拉 SBG900)。我的带宽应该是 8Mbit 下载和 0.7Mbit 上传。前段时间一切都很好,但最近几周我的下载速度一直低于 400-450kB/s。今天我仔细检查了一下,似乎 USB 连接有问题。我尝试通过 RJ45 连接到调制解调器,最大下载速度为 8Mbit(良好)。我回到 USB,速度不超过 400-450kB/s(即 4mbits)。

我不知道哪里出了问题。我不能使用 RJ45 - 我必须使用 USB 连接电缆调制解调器。

请帮忙..

$ uname -a
Linux NAS 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:05:41 UTC 2011 i686 i686 i386 GNU/Linux

$ sudo lsusb -v -s 004:004

Bus 004 Device 004: ID 07b2:0900 Motorola BCS, Inc. SURFboard Gateway
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            2 Communications
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        32
  idVendor           0x07b2 Motorola BCS, Inc.
  idProduct          0x0900 SURFboard Gateway
  bcdDevice            1.01
  iManufacturer           1 Motorola Corporation
  iProduct                2 USB Cable Modem
  iSerial                 3 XXXXXXXXXXXX
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           80
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          4 USB Ethernet Configuration
    bmAttributes         0xc0
      Self Powered
    MaxPower              100mA
    ** UNRECOGNIZED:  05 24 00 10 01
    ** UNRECOGNIZED:  05 24 06 00 01
    ** UNRECOGNIZED:  0d 24 0f 03 00 00 00 00 ea 05 00 00 00
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      6 Ethernet Networking
      bInterfaceProtocol      0 
      iInterface              5 Communication Interface Class
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              64
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 
      iInterface              6 Data Interface Class
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 
      iInterface              6 Data Interface Class
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
Device Status:     0x0001
  Self Powered

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