ELSA MicroLink 56k Fun USB¶

This is a Softmodem/Winmodem, which means all the DSP math has to be performed by the host computer CPU.

It is using the ST7554 USB softmodem chipset. No open source drivers were ever released.

Bus 001 Device 041: ID 0483:7554 STMicroelectronics 56k SoftModem                                                                                              
Device Descriptor:                                                                                                                                             
  bLength                18                                                                                                                                    
  bDescriptorType         1                                                                                                                                    
  bcdUSB               2.00                                                                                                                                    
  bDeviceClass            2 Communications                                                                                                                     
  bDeviceSubClass         0                                                                                                                                    
  bDeviceProtocol         0                                                                                                                                    
  bMaxPacketSize0         8                                                                                                                                    
  idVendor           0x0483 STMicroelectronics                                                                                                                 
  idProduct          0x7554 56k SoftModem                                                                                                                      
  bcdDevice            2.10                                                                                                                                    
  iManufacturer           0                                                                                                                                    
  iProduct                0                                                                                                                                    
  iSerial                 0                                                                                                                                    
  bNumConfigurations      1                                                                                                                                    
  Configuration Descriptor:                                                                                                                                    
    bLength                 9                                                                                                                                  
    bDescriptorType         2                                                                                                                                  
    wTotalLength       0x008a                                                                                                                                  
    bNumInterfaces          1                                                                                                                                  
    bConfigurationValue     1                                                                                                                                  
    iConfiguration          0                                                                                                                                  
    bmAttributes         0xa0                                                                                                                                  
      (Bus Powered)                                                                                                                                            
      Remote Wakeup                                                                                                                                            
    MaxPower              100mA                                                                                                                                
    Interface Descriptor:                                                                                                                                      
      bLength                 9                                                                                                                                
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass    128 
      bInterfaceProtocol    255 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       1
      bNumEndpoints           3
      bInterfaceClass         2 Communications
      bInterfaceSubClass    128 
      bInterfaceProtocol    255 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       2
      bNumEndpoints           3
      bInterfaceClass         2 Communications
      bInterfaceSubClass    128 
      bInterfaceProtocol    255 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       3
      bNumEndpoints           5
      bInterfaceClass         2 Communications
      bInterfaceSubClass    128 
      bInterfaceProtocol    255 
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            1
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0080  1x 128 bytes
        bInterval               1
      INVALID CDC (Header):  09 24 00 00 01 04 24 03 00
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
  (Bus Powered)
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