User's Manual Part 1

3: Detailed Description
APCD-LM043-8.0 (DRAFT C) 15
• Transmission Line on page 17
• Lightning Arrestor on page 17 (for outdoor antenna installation)
EUM
The EUM, shown in Figure 6, is a wireless modem that connects to the end-user’s computer
through an Ethernet connection.
The EUM, which acts as a network bridge, receives data from the CCU over the 900 MHz
radio link, and then forwards this data to EUM internal processes or to the end-user’s
computer through the Ethernet port. In the other direction, the EUM forwards data received
from the end-user’s computer over the radio link to the CCU.
Figure 6 EUM
The EUM functional blocks are the same as those of the CCU and are illustrated in Figure 10.
EUM Antenna
For many EUM installations, you can use an indoor antenna. WaveRider recommends the
WaveRider directional antenna with switched-beam diversity. This antenna, shown in Figure
7, performs very well in cases where the radio path to the CCU is obstructed and/or where
there is significant multipath. The antenna comes with a mounting bracket and is designed to