TransferJet basic overview tutorial-features,frame,PHY,stack,security
This page of tutorials section covers TransferJet basic overview tutorial describing features, TransferJet frame, TransferJet protocol stack, TransferJet physical layer and TransferJet security basics.
TransferJet is basically a wireless technology used for large file transfer between two electronic products at high speed. The electronic products include mobiles, camcorders, cameras, computers, TVs, printers etc. TransferJet Consortium has defined the technical specifications of this technology. The file transfer is very easy and takes place in push and pull mode. The technology incorporates benefits of both UWB as well as NFC technologies. It works as if we do file transfer using USB cable. Following table mentions features of TransferJet technology.
|RF Frequency||4.48 GHz|
|Transmit power(Average power)||-70dBm/MHz or lower|
|Data rate (Depends on communication channel)|| Maximum: 560 Mbps
Effective rate: 375 Mbps
|Coverage distance||few centimeters (About 3cm)|
|Network topology||point to point (P2P)|
|Antenna Element||Electric induction field coupler|
Table-1: TransferJet features
How TransferJet works?
In TransferJet system, two electronic devices which transfers data between them are referred as
"Initiator" and "Responder". The same is depicted in figure-1.
The system works based on "Touch Model" concept and hence it is very simpler.
TransferJet frame structure
The figure-2 depicts the TransferJet frame. As shown it is composed of preamble, sync, PHY header and payload (CPDU). In this frame, Payload is formed after the data from layer-2 (Connection Layer) is passed through the TransferJet PHY layer modules such as FEC encoder, spreading, scrambler and data modulation. Data from CNL layer is broken into 224 byte message blocks before being passed to the PHY layer.
As shown in the TransferJet frame, each CPDU consists of headers, sub-headers, CRC information and 1 or 2 payload fields. The payload will have about 1 to 4096 Bytes of data information.
Full forms of terms mentioned above are as follows:
PSDU-PHY Layer Service Data Unit
CPDU-Connection Layer Protocol Data Unit
CSDU-Connection Layer Service Data Unit
IFS-Inter Frame Space
TransferJet protocol stack
The TransferJet protocol stack consists of physical layer(PHY),Connection Layer(CNL),Protocol Conversion Layer(PCL) and application layers.
TransferJet Physical layer(TransferJet PHY)
The TransferJet Physical layer takes care of preamble and header(SYNC) insertion in the
It takes care of FEC(Forward Error Correction), Spreading, Scrambling and modulation functionalities.
TransferJet technology works almost like physical cable. Hence it has no encryption functionality incorporate in the link layer. Hence security is not needed in this system.