Chapter 3 – Troubleshooting

Situation B: The modem always returns «No carrier» when trying to issue a communication

Solutions for “no carrier” message

If the modem returns …

Then ask …

Action

no carrier

Is the selected

Type AT+CEER to view the extended

(esp. for data communication)

bearer type

error code (see “Error Results Codes"

 

supported by the

in the AT Command guide).

 

called party?

Be sure that the selected bearer type

 

Is the selected

is supported by the called party.

 

Be sure that the selected bearer type

 

bearer type

is supported by the network.

 

supported by the

If no success, try bearer selection

 

network?

type: AT+CBST=0,0,3

 

 

Be sure SIM card is available for

 

 

data/fax calls.

no carrier

 

Be sure that the semicolon character

(esp. for voice communication)

 

(“;”) is typed immediately after the

 

 

phone number in the AT command.

 

 

E.g., ATD######; type

 

 

AT+CBST=0,0,3

 

 

Configure the SIM card for data/fax

 

 

calls.

 

Is the received

See “Verifying Signal Strength.”

 

signal strong

 

 

enough?

 

 

Is the antenna

See “Antenna/RF Specifications.”

 

properly

 

 

connected?

 

Multi-Tech Systems, Inc. MultiModem® GPRS with USB User Guide

32

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Multi-Tech Systems MTCBA-G-UF1, MTCBA-G-UF2 manual Solutions for no carrier message
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MTCBA-G-UF1, MTCBA-G-UF2 specifications

Multi-Tech Systems has long been a leader in the field of communication technology, offering a wide range of devices and solutions designed to enhance connectivity for various applications. Among their notable products are the MTCBA-G-UF2 and MTCBA-G-UF1 devices, which are designed to provide efficient and reliable connectivity for IoT applications and industrial use.

The MTCBA-G-UF2 and MTCBA-G-UF1 are advanced cellular modem solutions that support both 3G and 4G LTE networks. These devices are built to offer robust performance, ensuring seamless data transmission across various environments. The MTCBA-G-UF2 comes equipped with dual SIM capability, which enhances connectivity by allowing users to switch between different cellular networks effortlessly. This feature is particularly advantageous for mission-critical applications where consistent connectivity is essential.

Both models feature Multi-Tech’s renowned easy-to-use interface, which simplifies the installation and configuration process. The devices support various communication protocols, making them versatile options for a wide range of applications, including remote monitoring, telemetry, and fleet management. Their compact design ensures they can be integrated into various systems without occupying significant space.

One of the standout characteristics of both the MTCBA-G-UF2 and MTCBA-G-UF1 is their support for advanced security features. The devices implement robust encryption protocols, ensuring that data transmitted over cellular networks is safe and secure from unauthorized access. This is especially critical for businesses that handle sensitive information or operate in regulated industries.

Additionally, these modems are designed to withstand harsh environmental conditions, making them suitable for outdoor use. With wide operating temperature ranges and rugged enclosures, they are capable of functioning in various climates and situations. Furthermore, Multi-Tech Systems provides extensive support and documentation, enabling users to leverage the full potential of their devices.

In conclusion, the Multi-Tech Systems MTCBA-G-UF2 and MTCBA-G-UF1 are powerful solutions tailored for reliable and secure cellular connectivity. With their rich set of features, including dual SIM support, multi-protocol functionality, and secure data transmission, they are ideal choices for various IoT applications and industries requiring dependable communication solutions. These modems exemplify Multi-Tech's commitment to innovation and reliability in the ever-evolving world of connected devices.
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