LBI-38848D

Figure 1 - GE-MARC Block Diagram

Figure 3 - Signal Timing

tone in order for the radio to enter the Ready mode. If no busy tone is present or if the four-tone sequence isn’t valid, the mobile will jump to the next channel in the call originate set and check for busy tone as described above.

Ready Mode

When an incoming call has been detected or an idle chan- nel has been acquired, the mobile enters the Ready mode. In this mode, the audio and push-to-talk circuits are enabled, the speaker is unmuted, and the operator is alerted by an alert tone. The radio can then be used in the conventional push-to-talk manner with the radio remaining on the channel until the operator hangs up or the repeater drops the busy tone causing the unit to revert to Idle mode.

NOTE

GLOSSARY OF GE-MARC TERMS

Idle Mode

In the "standby" condition, the mobile is inactive but prepared to call or be called. The trunked radios are IDLE until they are turned off.

Wait Mode

In the "attempting origination" condition, the Wait mode is entered from Idle mode (only) as the user presses the PTT switch on the microphone, or comes "off-hook".If successful, the unit becomes READY. Otherwise, the unit is IDLE or IDLE/WAIT after all channels are tried.

Busy Tone

A"Voice-plus"tone of 3051.9 Hz is the standard busy tone. The 2918 Hz is the alternate busy tone. The busy tone modulates mobile and repeater transmitters at a low level of 1 kHz deviation continuously. This tone is filtered out of the received audio and is used to hold the communication chan- nel active. It also excludes other mobiles from using the channel when a call is active.

Acquisition Tone

A 1962.9 Hz tone sent at full deviation for 50 millisec- onds from the repeater is used as acknowledgment from the repeater that a busy tone was sent and signals the mobile that signalling tones can now be sent.

If a call is initiated and a sequence of five beeps is sounded, the user cannot access the radio system because the mobile is out of receive range or is inoperative. Any subsequent call will be ignored for 20 seconds.

Figure 2 - GE-MARC Operational Modes

Ready Mode

In the "operating" condition, Ready is entered from Idle mode via Wait mode when calling or directly from Idle when called. Ready mode ends (the radio reverts to Idle) when the user disconnects or with the loss of received Busy Tone from the repeater. This normally occurs when the repeater shuts down after communication is completed.

Collect Tone

A tone chosen from 34 standardized frequencies, rang- ing from 508.6 Hz to 2792.4 Hz, is used as the first tone in the group tone sequence. The collect tone is used to gather all mobiles with the same collect tone for decoding a call. The duration of the tone varies as a function of the number of channels which are programmed into the mobile and/or repeater.

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Ericsson LBI-38848D manual Ready Mode, Glossary of GE-MARC Terms, Busy Tone, Acquisition Tone, Collect Tone
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LBI-38848D specifications

The Ericsson LBI-38848D is a versatile and powerful telecommunications system designed to meet the evolving demands of modern communication networks. This unit exemplifies Ericsson's commitment to innovation, quality, and efficiency in mobile and wireless technologies, establishing itself as a key component in various environments, including urban and rural deployments.

One of the standout features of the LBI-38848D is its advanced processing capabilities. It incorporates state-of-the-art digital signal processing, which enhances its ability to manage high-frequency data transmission. This results in improved reliability and speed, catering to the increasing need for rapid data services that modern consumers expect.

Supporting various communication standards, including GSM, UMTS, and LTE, the LBI-38848D is engineered to seamlessly integrate with existing networks while simultaneously preparing for future upgrades and expansions. Its multi-band and multi-mode capabilities allow operators to deliver services across different frequency bands, providing flexibility and optimizing spectrum utilization.

Another key characteristic of the LBI-38848D is its energy efficiency. With a focus on sustainability, Ericsson has designed this system to minimize power consumption without compromising performance. This is increasingly important as operators aim to reduce operational costs and comply with environmental regulations while also meeting the growing demand for data services.

Reliability and durability are also paramount in the design of the LBI-38848D. It is built to withstand a variety of environmental conditions, making it suitable for outdoor deployments in diverse climates. The system's robust construction ensures long-term operation with minimal maintenance, enhancing its total cost of ownership.

Additionally, the LBI-38848D features intelligent network management capabilities, which facilitate real-time monitoring and optimization. These features empower network operators to proactively manage resources, predict potential issues, and enhance service delivery, thus improving user satisfaction.

In conclusion, the Ericsson LBI-38848D stands out in the telecommunications landscape due to its combination of advanced technological features, energy efficiency, and reliability. Its ability to support multiple communication standards and functions makes it an essential asset for operators looking to enhance their network performance and prepare for the future of connectivity. As the demand for high-speed communication continues to surge, the LBI-38848D positions itself as a leading solution in the ever-evolving telecommunications sector.
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