User`s manual

CR-SEB
Introduction
The CR-SEB 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, CR-SEB products provide a 10/100BaseT connection to Ethernet networks. CR-
SEB 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 CR-SEBs are Slave devices. Peer-to-peer
communication is accomplished by using the master CR-SEB device to relay datagrams from one slave
CR-SEB device to another slave CR-SEB device.
Contained in a DIN Rail enclosure, CR-SEB is designed for factory and industrial applications. The CR-
SEBX features a remote radio in a NEMA 4X/IP66 rated enclosure that can be mounted outdoors up to
300 feet from the network connection. Communication between CR-SEB products is performed using the
Cirronet over-the-air protocol. Thus the CR-SEB products are 802.3 compatible but not 802.11
compatible and provide 400Kbps data throughput. Certified by the FCC and ETSI, and CE marked, CR-
SEB products can be deployed license-free around the world.
The CR-SEBs enjoy the benefits of frequency-hopping spread spectrum technology. 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, CR-SEBs can be used license-free worldwide.
The radios in CR-SEB 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.
 2000- 2004 Cirronet Inc 0 M-2410-0025 Rev A