Keenetic Linear » History » Version 3
laforge, 12/16/2022 12:10 PM
| 1 | 1 | laforge | h1. Keenetic Linear |
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| 3 | 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. |
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| 5 | 2 | laforge | {{thumbnail(20221216_125606.jpg)}} |
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| 7 | {{thumbnail(20221216_125629.jpg)}} |
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| 9 | 1 | laforge | h2. Hardware |
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| 11 | 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. |
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| 13 | * Skyworks Si32287 attachment:Si3228x-datasheet.pdf |
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| 14 | * EFM32HG310F64G attachment:efm32hg-datasheet.pdf |
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| 15 | 2 | laforge | |
| 16 | {{thumbnail(20221216_130144.jpg)}} |
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| 17 | {{thumbnail(20221216_130152.jpg)}} |
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| 18 | {{thumbnail(20221216_130317.jpg)}} |
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| 19 | 3 | laforge | {{thumbnail(20221216_124809.jpg)}} |
| 20 | {{thumbnail(20221216_124803.jpg)}} |
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| 21 | 1 | laforge | |
| 22 | h2. USB interface |
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| 23 | |||
| 24 | _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: |
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| 25 | |||
| 26 | <pre> |
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| 27 | Bus 001 Device 124: ID 31b7:0002 Keenetic, Ltd. USB CDC serial port device |
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| 28 | Device Descriptor: |
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| 29 | bLength 18 |
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| 30 | bDescriptorType 1 |
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| 31 | bcdUSB 2.00 |
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| 32 | bDeviceClass 2 Communications |
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| 33 | bDeviceSubClass 0 |
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| 34 | bDeviceProtocol 0 |
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| 35 | bMaxPacketSize0 64 |
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| 36 | idVendor 0x31b7 |
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| 37 | idProduct 0x0002 |
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| 38 | bcdDevice 0.00 |
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| 39 | iManufacturer 1 Keenetic, Ltd. |
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| 40 | iProduct 2 USB CDC serial port device |
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| 41 | iSerial 3 S2145NS000558 |
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| 42 | bNumConfigurations 1 |
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| 43 | Configuration Descriptor: |
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| 44 | bLength 9 |
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| 45 | bDescriptorType 2 |
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| 46 | wTotalLength 0x0043 |
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| 47 | bNumInterfaces 2 |
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| 48 | bConfigurationValue 1 |
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| 49 | iConfiguration 0 |
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| 50 | bmAttributes 0xc0 |
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| 51 | Self Powered |
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| 52 | MaxPower 100mA |
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| 53 | Interface Descriptor: |
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| 54 | bLength 9 |
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| 55 | bDescriptorType 4 |
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| 56 | bInterfaceNumber 0 |
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| 57 | bAlternateSetting 0 |
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| 58 | bNumEndpoints 1 |
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| 59 | bInterfaceClass 2 Communications |
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| 60 | bInterfaceSubClass 2 Abstract (modem) |
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| 61 | bInterfaceProtocol 0 |
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| 62 | iInterface 0 |
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| 63 | CDC Header: |
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| 64 | bcdCDC 1.20 |
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| 65 | CDC Call Management: |
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| 66 | bmCapabilities 0x00 |
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| 67 | bDataInterface 1 |
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| 68 | CDC ACM: |
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| 69 | bmCapabilities 0x02 |
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| 70 | line coding and serial state |
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| 71 | CDC Union: |
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| 72 | bMasterInterface 0 |
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| 73 | bSlaveInterface 1 |
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| 74 | Endpoint Descriptor: |
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| 75 | bLength 7 |
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| 76 | bDescriptorType 5 |
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| 77 | bEndpointAddress 0x82 EP 2 IN |
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| 78 | bmAttributes 3 |
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| 79 | Transfer Type Interrupt |
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| 80 | Synch Type None |
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| 81 | Usage Type Data |
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| 82 | wMaxPacketSize 0x0040 1x 64 bytes |
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| 83 | bInterval 255 |
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| 84 | Interface Descriptor: |
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| 85 | bLength 9 |
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| 86 | bDescriptorType 4 |
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| 87 | bInterfaceNumber 1 |
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| 88 | bAlternateSetting 0 |
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| 89 | bNumEndpoints 2 |
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| 90 | bInterfaceClass 10 CDC Data |
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| 91 | bInterfaceSubClass 0 |
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| 92 | bInterfaceProtocol 0 |
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| 93 | iInterface 0 |
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| 94 | Endpoint Descriptor: |
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| 95 | bLength 7 |
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| 96 | bDescriptorType 5 |
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| 97 | bEndpointAddress 0x81 EP 1 IN |
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| 98 | bmAttributes 2 |
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| 99 | Transfer Type Bulk |
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| 100 | Synch Type None |
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| 101 | Usage Type Data |
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| 102 | wMaxPacketSize 0x0040 1x 64 bytes |
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| 103 | bInterval 0 |
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| 104 | Endpoint Descriptor: |
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| 105 | bLength 7 |
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| 106 | bDescriptorType 5 |
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| 107 | bEndpointAddress 0x01 EP 1 OUT |
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| 108 | bmAttributes 2 |
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| 109 | Transfer Type Bulk |
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| 110 | Synch Type None |
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| 111 | Usage Type Data |
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| 112 | wMaxPacketSize 0x0040 1x 64 bytes |
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| 113 | bInterval 0 |
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| 114 | Device Status: 0x0001 |
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| 115 | Self Powered |
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| 116 | </pre> |
