High-speed Wireless LAN Technology
Improving office IT environment with comfort and security
Wireless LAN becomes popular in offices. In fact, the office where a network is operated only by wireless LAN has appeared. Demands are increasing for layout independent network where PCs, printers, and multi-function printers (MFPs) are connected without cables. An optional board featuring this technology adds speed and high security to document management including printing and “scan-to-Email” in a wireless environment. Another advantage of this technology is a stable connection that is not easily affected by fluctuations in the wireless environment, under the rapid increase in a wireless LAN node in recent years.
Wireless LAN with stability and speed
This technology is carefully implemented to ensure stable, high-speed wireless LAN communications. The antennas are specifically optimized for desktop and floor-standing printers/MFPs. We integrated features needed for this new technology into the control LSI (with built-in CPU and memory) with embedded software.
Ricoh developed the following core modules for the technologies conforming to IEEE802.11 wireless LAN standards:
(1) Control software corresponding to MAC sublayer
Ricoh developed the control software for the hardware modules in this sublayer and lower-level layers. The software receives commands from higher-level layers (such as device drivers) and establishes communications with the destination terminal using protocols conforming to the standards. The development team thoroughly verified interconnectivity with a variety of terminals, and carefully designed the algorithm to improve connectivity.
(2) Control LSI corresponding to MAC sublayer and PLCP sublayer
The LSI is an SoC (System on Chip) device integrating CPU, memory, and AD/DA converters. It is a key device that provides data framing, time management, encryption, modulation/demodulation, and interfaces for MFPs and laser printers. Supported encryption schemes are WEP (ARC4), TKIP (ARC4), and CCMP (AES), and supported modulation/demodulation schemes are DBPSK, DQPSK, BPSK, QPSK, 16QAM, and 64QAM for primary modulation and DSSS/CCK and OFDM for secondary modulation. The architecture is optimized for MFPs and laser printers; rich functions and performance are integrated into one chip.
(3)Radio-frequency (RF) circuit corresponding to PMD sublayer
This circuit supports channels of the 2.4 GHz band and the 5 GHz band. Support for the 5 GHz band allows users to enjoy high-speed communications in an environment where interference waves are marginal. The circuit is approved under local regulations in many countries and regions – Japan, USA, Canada, Europe, China, and Taiwan. While the board is common to all countries and regions, it operates in accordance with radio wave restrictions of the shipping destinations.
Enabling multi-channel operability and high security
It also supports IEEE802.11i security standards, which stipulate the authentication and encryption protocols of the devices. And it also supports IEEE 802.1X (RADIUS) authentication, that is rare, as a wireless LAN function for Enterprise printers and multi-function printers (MFPs). These function enable a level of security comparable to or higher than wired LAN.
The features of this technology
- ●High connectivity with a variety of access points (master stations) of different characteristics
- ●Mostly immune to fluctuations in radio environment (easy connection and support)
- ●Short time to connect (up to 5 seconds shorter, compared to previous Ricoh models)
- ●Long communication spans thanks to specially designed antennas (up to 70% improvement over previous Ricoh models)
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