Rev 1 Dec.10
Proprietary and Confidential - Specifications subject to change
47
•
Modem-initiated (Remote Wakeup):
a.
Module enables its USB clock.
b.
Module enables the USB transceiver.
c.
Module sends the resume signal for at least 20 ms.
4.8 RF interface
The AirPrime SL808X Embedded Module’s RF (radio frequency) interface uses
two antenna ports for Tx/Rx and GPS.
describes the purpose and
features of this interface.
4.8.1 RF connections
To protect the antenna lines from baseband signal noise:
•
Connection from each antenna port (RF) to the antenna should use a coax
cable or a good microstrip/strip line.
•
RF trace should be 50
to avoid mismatch and load pull effects.
•
RF connection must be isolated from other high voltage and noisy signals to
ensure a good Rx sensitivity level.
•
RF traces on the host PCB could be lossy, so should be kept as short as
possible.
For more information, see
Table 4-15: USB interface features
Feature
Details
Purpose
•
Primary antenna—Rx/Tx
•
GPS antenna—GPS functionality
Standard
•
USB 2.0 compliant
•
CDC 1.1 - ACM compliant
Data rates supported
•
Optimized for high speed (480 Mbps)
•
Full speed (12 Mbps)—Throughput performance is on an
“as-is” basis and must be characterized by the OEM.
Note: Throughput rates may vary significantly based on packet
size, host interface, and firmware revision.
Enumeration
•
Windows (using host Windows drivers)—COM ports
•
Linux (with Sierra Wireless driver)—/dev/ttyUSB
n
devices
Additional features
•
Firmware download over USB
Power supply
•
VCC supply
•
3.3 V type compatible
Impedance
•
Nominal: 50
•
DC: 0
Summary of Contents for AirPrime SL808 Series
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