Keenetic Linear » History » Revision 2
Revision 1 (laforge, 12/16/2022 12:06 PM) → Revision 2/3 (laforge, 12/16/2022 12:09 PM)
h1. Keenetic Linear The _Keenetic Linear_ is a two-port FXS adapter with a USB interface. It allows you to interface two analog telephones with a soft switch or VoIP device. The vendor originally intends this device to be used with one of their own Router/CPE. {{thumbnail(20221216_125606.jpg)}} {{thumbnail(20221216_125617.jpg)}} {{thumbnail(20221216_125629.jpg)}} h2. Hardware The hardware is based around the "Skyworks Si32287 Single-chip Dual Channel ProSLIC":https://www.skyworksinc.com/en/Products/Voice/Si3228x-Dual-Channel-ProSLIC/Si32287 attached to an "EFM32HG310F64G":https://www.silabs.com/mcu/32-bit-microcontrollers/efm32-happy-gecko/device.efm32hg310f64g-qfn32 (Cortex-M0+) microcontroller. * Skyworks Si32287 attachment:Si3228x-datasheet.pdf * EFM32HG310F64G attachment:efm32hg-datasheet.pdf {{thumbnail(20221216_130144.jpg)}} {{thumbnail(20221216_130152.jpg)}} {{thumbnail(20221216_130317.jpg)}} h2. USB interface _of course_ the vendor couldn't bother to implement a standard USB-Audio interface or similar. Instead, a custom CDC-ACM based interface is exposed by the device: <pre> Bus 001 Device 124: ID 31b7:0002 Keenetic, Ltd. USB CDC serial port device Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 2 Communications bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x31b7 idProduct 0x0002 bcdDevice 0.00 iManufacturer 1 Keenetic, Ltd. iProduct 2 USB CDC serial port device iSerial 3 S2145NS000558 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x0043 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 2 Communications bInterfaceSubClass 2 Abstract (modem) bInterfaceProtocol 0 iInterface 0 CDC Header: bcdCDC 1.20 CDC Call Management: bmCapabilities 0x00 bDataInterface 1 CDC ACM: bmCapabilities 0x02 line coding and serial state CDC Union: bMasterInterface 0 bSlaveInterface 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 255 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 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 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Device Status: 0x0001 Self Powered </pre>
