
Hardware
Antenna placement
Digi XBee Cellular LTE Cat 1 Embedded Modem User Guide
34
secondary port is optional. The secondary antenna improves receive performance in certain
situations, so we recommend it for best results.
Antenna placement
It is important to keep the antenna as far away from the XBee Cellular Modem and other metal
objects as possible. Often, small antennas are desirable, but at the cost of increasing size of dead
zones because of reduced range and efficiency.
We recommend that antennas do not touch each other, but the XBee Cellular Modem works if they do.
To optimize receive performance, orient the two antennas at right angles to each other.
SIM card
The XBee Cellular Modem uses the 4FF/nano SIM card size.
CAUTION!
Never insert or remove SIM card while the power is on!
The Associate LED
The following table describes the Associate LED functionality. For the location of the Associate LED on
the XBIB-U development board, see number 6 on the
.
LED status
Blink
timing
Meaning
On, solid
Not joined to a mobile network.