Cirronet SEM2410 Guide de l'utilisateur télécharger pdf (Page 6)

SEM2410

Introduction

The SEM2410 family of products from Cirronet™ Incorporated provides wireless Ethernet

connectivity between networks located more than 5 miles apart. Built around the WIT2410

frequency hopping spread spectrum data modem, SEM products provide a 10/100BaseT

connection to Ethernet networks. SEM products operate in a point-to-point mode or a point-to-

multipoint mode using a star configuration. The center of the “star” is the Master device and the

remote SEMs are Slave devices. Peer-to-peer communication is accomplished by using the

master SEM device to relay datagrams from one slave SEM device to another slave SEM device.

SEMs come in heavy duty, aluminum enclosures suitable for the rugged industrial environment.

The D models come in a DIN rail mount, rugged enclosure designed for factory and industrial

applications. The X models features a remote radio housed in a NEMA 4X/IP66 rated enclosure

that can be mounted outdoors up to 300 feet from the network connection. Communication

between SEM products is performed using the WIT2410 over-the-air protocol. Thus the SEM

products are 802.3 compatible but not 802.11 compatible and provide 230Kbps full duplex data

throughput. Certified by the FCC and ETSI, and CE marked, SEM products can be deployed

license-free around the world.

The SEMs enjoy the same benefits of frequency-hopping spread spectrum technology that the

WIT2410s do. Namely, the immunity to multipath fading and resistance to jamming that is

provided by changing frequency every few milliseconds. Operating in the 2.4GHz ISM band,

SEMs can be used license-free worldwide.

The radios in SEM products include a robust over-the-air protocol. This protocol insures error-

free data through the use of a 24-bit CRC and ARQ to detect errors and to automatically request

a retransmission. All of this is transparent to the network which just sees complete error-free

data.

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Cirronet SEM2410 Guide de l'utilisateur Page 6