Over the years Bluetooth has evolved from being used mostly for audio streaming and file sharing with BT2.0, to high-speed file transfer with BT2.1. With the updates to BT4.x, it is now also used for extremely low energy connectivity requirements for many sensor based applications ideal for the Internet of Things.
Silex Technology America, the global leader in providing Wi-Fi solutions on June 2nd 2017 launched the latest embedded wireless solution , the SX-SDPAC. The SX-SDPAC SDIO System-in-Package(SiP) is a dual band 1x1 802.11a/b/g/n/ac plus Bluetooth 4.1+HS “Smart Ready” , which is based on Qualcomm Atheros QCA9377 System-on-Chip (SoC). With the smallest footprint of space, it is Wave 2 MU-MIMO 802.11ac. and offers cost effective, and low power Wi-Fi+BT connectivity solution for our customers.
Today, I will write about basics of Bluetooth Classic specification. We will find an answer to simple question from the specification that who or what decides Bluetooth (ACL) frame type. In this article, I will refer to original bluetooth specification document like “Vol.2 Part.B …” from the Core Spec 4.2 unless noted otherwise.
ACL Frame Type
Bluetooth Classic defines ACL (Asynchronous Connection Less) for general data frame and SCO (Synchronous Connection Oriented) for synchronous audio frame. ACL has two frame types, DM (which provides Forward Error Correction:FEC) and DH (which doesn’t provide FEC). In addition to these, the number is appended to these frame types like “DM1” or “DH3” to indicate
how many 625 usec. “slot” will be occupied. In EDR (Enhanced Data Rate) introduced with Bluetooth 2.0, DH frame got double and triple the data rate mode denoted like “2-DH1” or “3-DH5”. All these ACL frame types defined in Vol.2 Part.B 6.5.4 are summarized in Table 1.
On Tuesday we released our latest embedded Wi-Fi module, the SX-SDMAC. The SX-SDMAC is a dual-band, single stream, 802.11a/b/g/n/ac plus Bluetooth “Smart Ready” module based on the latest Qualcomm Atheros QCA9377 System-on-Chip (SoC). It is the industry's first Wave 2 MU-MIMO IEEE 802.11ac SDIO Wi-Fi module fully certified for North America, Europe, and Japan in full production. It delivers enterprise-grade, dual-band 802.11ac Wi-Fi connectivity with link rates as high as 433Mbps. Click here to view the full press release.
The SX-SDMAC is designed for mission-critical applications including industrial automation, healthcare, environmental monitoring, factory automation and telematics. Highly regulated industries like medical sometimes require long product life cycles. Silex can address such customer needs by offering the option to continue manufacturing our products like the SX-SDMAC for extended periods of time in our own factory.