Technical Specs
Table Of Contents
- Important Notice
- Safety and Hazards
- Limitation of Liability
- Contents
- List of Tables
- List of Figures
- 1: Introduction
- 2: Electrical Specifications
- 3: RF Specifications
- 4: Power
- 5: Software Interface
- 6: Mechanical and Environmental Specifica- tions
- 7: Regulatory Compliance and Industry Certifi- cations
- A: Antenna Specification
- B: Design Checklist
- C: Testing
- AT Command Entry Timing Requirement
- Acceptance Testing
- Certification Testing
- Production Testing
- Functional Production Test
- Quality Assurance Testing
- Suggested Testing Equipment
- Testing Assistance Provided by Lantronix, Inc.
- IOT/Operator Testing
- Extended AT Commands for Testing
- D: Packaging
- E: References
- F: Acronyms
Rev 5 May.21
38
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Product
Technical
Specification
Important: LTE networks expect modules to have more than one antenna enabled for proper
operation. Therefore, customers must not commercially deploy their systems with the diversity
antenna disabled.
Note: A diversity antenna is used to improve connection quality and reliability through redundancy.
Because two antennas may experience difference interference effects (signal distortion, delay, etc.),
when one antenna receives a degraded signal, the other may not be similarly affected.
Ground Connection
When connecting the module to system ground:
•
Prevent noise leakage by establishing a very good ground connection to the module
through the host connector.
•
Connect to system ground using the mounting hole shown in Figure 3-1 on page 36.
•
Minimize ground noise leakage into the RF.
Depending on the host board design, noise could potentially be coupled to the
module from the host board. This is mainly an issue for host designs that have signals
traveling along the length of the module, or circuitry operating at both ends of the
module interconnects.
Interference and Sensitivity
Several interference sources can affect the module’s RF performance (RF desense).
Common sources include power supply noise and device-generated RF.
RF desense can be addressed through a combination of mitigation techniques (Methods
to Mitigate Decreased Rx Performance on page 39) and radiated sensitivity measurement
(Radiated Sensitivity Measurement on page 40).
Note: The EM7411 is based on ZIF (Zero Intermediate Frequency) technologies. When performing
EMC (Electromagnetic Compatibility) tests, there are no IF (Intermediate Frequency) components
from the module to consider.
Interference from Other Wireless Devices
Wireless devices operating inside the host device can cause interference that affects the
module.
To determine the most suitable locations for antennas on your host device, evaluate each
wireless device’s radio system, considering the following:
•
Any harmonics, sub-harmonics, or cross-products of signals generated by wireless
devices that fall in the module’s Rx range may cause spurious response, resulting in
decreased Rx performance.
•
The Tx power and corresponding broadband noise of other wireless devices may
overload or increase the noise floor of the module’s receiver, resulting in Rx desense.