Feature Directory

Handset

Handset jack

Hold/Ring button

Line jack

(on back of voice terminal)

Message light

Mute button

Speaker button

Speakerphone/headset adapter jack (on back of voice terminal)

Test button

3 Call appearance buttons

Transfer button

Aquick reference list of 12 voice features (F1 through F9, F*, F0, and F#) available on your voice terminal. For directions on using your Feature Directory, see “How to Use the Feature Directory” later in this guide.

A handset is provided for placing and receiving calls. (The handset is also known as the receiver.) In most cases, you must lift the handset (go off-hook) before you can use a feature.

This jack is for connecting a handset to your voice terminal. The jack

is labeled .

A red button for putting a call on hold. Either Ring or is

printed below Hold to remind you that by pressing Feature and then Hold , you can select a personalized ringing pattern for your voice terminal. You can choose from among eight possible ringing patterns.

This jack is used for connecting a line cord to your voice terminal. The jack is labeled “LINE.”

A red light which goes on steadily when a message has been left for

you. This light may be labeled Message or .

For turning off the microphone associated with the handset so the other person on the call cannot hear you.

Note: When you use the 8403 Speaker (listen-only) feature, the Mute feature is also activated and the light next to Mute is always on.

For accessing the Speaker feature. This feature can be used for listening only. If you want to speak to the other party, you must use the handset and the speaker must be off.

This jack is used for connecting an external speakerphone (such as an S101A or S201A Speakerphone) or a headset adapter (such as a 500A1 Headset Adapter) to your voice terminal. The jack is labeled .

When the voice terminal is initially powered up, the green light next

to Test flashes if the link with the DEFINITY switch or with System 75 is not (or not yet) operational. The light changes to steady green when the voice terminal is able to communicate with the DEFINITY switch or with System 75, and then goes off after a short period of time. After the voice terminal is powered up, you can press

Test to test the lights on your voice terminal.

These three buttons are devoted to handling incoming and outgoing calls (call appearances) and are labeled with an extension number. Each of these buttons has a red light to tell you that this is the line you are using or that this is the line you will get when you lift your handset. The green status light next to each call appearance button tells you the line or feature is being used.

For transferring a call to another voice terminal.

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Lucent Technologies 8403 manual Test button Call appearance buttons Transfer button
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8403 specifications

Lucent Technologies 8403 is a significant telecommunications switch that was primarily utilized in the late 1990s and early 2000s. It played a crucial role in the evolution of telecommunication systems, reflecting the rapid advancements in technology during that period. The 8403, part of the Lucent 8400 series, was known for integrating various features and capabilities that were vital for modern telecommunication networks.

One of the standout features of the Lucent 8403 was its advanced switching technology. Utilizing time division switching and digital signal processing, the device was capable of handling a large volume of calls simultaneously while maintaining high-quality voice transmission. This technology enabled efficient routing of calls and minimized the risk of dropped connections, which was a concern in earlier analog systems.

Another significant characteristic of the Lucent 8403 was its support for a wide range of telecommunications protocols. The switch was designed to facilitate both traditional telephone services and emerging digital services, including ISDN and Frame Relay. By accommodating both circuit-switched and packet-switched networks, the 8403 provided flexibility that major telecommunication providers demanded during that transition period.

The 8403 also featured enhanced signaling options, such as Common Channel Signaling System No. 7 (CCSS7), which allowed for improved call setup, control, and management. This feature significantly reduced the time it took to establish a call, thereby improving overall network efficiency.

Scalability was another key characteristic of the Lucent 8403. As telecommunication needs grew, service providers could expand their systems by integrating additional hardware and modules without requiring a complete overhaul of the existing infrastructure. This adaptability was crucial as demand for services fluctuated and as new technologies emerged.

Moreover, the switch was designed with reliability and redundancy features in mind. Its architecture included failover mechanisms that ensured continued operation even in the event of hardware failures. This reliability was essential for operators that required uninterrupted service delivery.

Lastly, the user-friendly interface of the Lucent 8403 provided simplified management and monitoring capabilities. System administrators could easily access performance metrics, troubleshoot issues, and manage configurations, facilitating more efficient maintenance and operations.

In conclusion, the Lucent Technologies 8403 played a transformative role in telecommunications infrastructure during its era. Its blend of advanced switching technology, protocol support, scalability, reliability, and user-friendly management tools made it a foundational component in the evolution of modern telecom networks. As a result, it served as a significant stepping stone toward the complex, integrated systems we see today.
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