TransferJet Tutorial : Features, Working, Frame Structure & Comparison

TransferJet is an advanced wireless communication technology designed for high speed, close proximity data transfer. Its unique features make it ideal for secure and fast exchanges between devices. This TransferJet tutorial covers its core features, working principles, protocol stack, frame structure and comparison with other wireless technologies such as WiFi and NFC including its advantages in wireless communication.

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.

Features of TransferJet

Specification TransferJet support
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?

TransferJet is a wireless technology designed to facilitate high-speed data transfers over very short distances. Its core advantage is simplicity: devices can exchange data by being placed in close proximity, often requiring them to be just a few centimeters apart. This unique mode of operation ensures faster and more secure communication, making it distinct from other wireless technologies like Wi-Fi, Bluetooth, and NFC. Here's an in-depth explanation of how TransferJet works:

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 utilizes inductive coupling to transmit data between two devices. When two TransferJet-enabled devices come into close proximity (typically within 3 cm), their antennas interact magnetically to establish a direct connection. This setup eliminates the need for complex device pairing or configuration, a llowing data to be transferred with a simple "touch."

TransferJet frame structure

TransferJet frame

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.
Read more.

TransferJet Physical layer(TransferJet PHY)

The TransferJet Physical layer takes care of preamble and header(SYNC) insertion in the TransferJet frame. It takes care of FEC(Forward Error Correction), Spreading, Scrambling and modulation functionalities.
Read more.

TransferJet security

TransferJet technology works almost like physical cable. Hence it has no encryption functionality incorporate in the link layer. The inherent security of TransferJet comes from its extremely short transmission range. Because the devices must be in very close proximity (almost touching), the risk of data interception is significantly reduced. This makes TransferJet a suitable technology for secure file transfers, such as personal data or confidential documents.

Comparison between TransferJet, WiFi and NFC

Following table compares TransferJet vs WiFi vs NFC and provide differences between them.

Feature TransferJet WiFi NFC
Speed Up to 375 Mbps (typical) Up to 9.6 Gbps (Wi-Fi 6) Up to 424 Kbps
Range Extremely short (a few centimeters) Long range (up to 100 meters) Short range (up to 10 cm)
Frequency Band 4.48 GHz 2.4 GHz, 5 GHz, 6 GHz (Wi-Fi 6E) 13.56 MHz
Power Consumption Low Moderate to high depending on usage Very low
Ease of Use Simple "touch-to-transfer" Requires network setup or direct pairing Simple, often automatic (e.g., payments)
Data Security High (short range reduces interception) High, with encryption protocols High (used in secure transactions)
Transfer Type Point-to-point file transfer Network-based and device-to-device Low-data exchanges (IDs, payments)
Use Case Sharing multimedia (photos, videos) Web browsing, large file downloads, media streaming Payment systems, ticketing, secure data exchange
Typical Devices Smartphones, cameras, laptops Smartphones, laptops, routers, smart TVs Smartphones, contactless cards
Interference Low (short range limits interference) Moderate (especially in crowded areas) Minimal (due to short range)
Applications Fast, secure file transfers between devices Internet access, file sharing, streaming Contactless payments, data exchange

Conclusion

With a simple and efficient design, TransferJet continues to be a top choice for applications requiring high speed, secure communication. This TransferJet tutorial provides a solid foundation for anyone looking to learn more about how TransferJet operates and its potential use cases.


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