CR3000 CRBasic programs require
PPPClose
before the
"deep sleep"
command and
PPPOpen
before the
"wakeup"
command.
The USB port provides power for module configuration, but is not sufficient for normal
operation.
6.3.3 Antenna connections
Connect the antenna to the Primary Antenna SMA connector.
FIGURE 6-4. Antenna connections
Use of the Diversity antenna can improve performance, but is not required.
Antenna diversity, also called space diversity, is a scheme that uses two or more antennas to
improve the quality and reliability of a wireless link. Often, especially in urban and indoor
environments, there is no clear line of sight between transmitter and receiver. Instead, the signal
is reflected along multiple paths before finally being received. Each bounce can introduce phase
shifts, time delays, attenuations, and distortions that can destructively interfere with one another
at the aperture of the receiving antenna.
CELL200-Series 4G LTE Cellular Module
29
