3 Basic Modem Operation

This chapter covers the basic commands and techniques involved in modem operation. In many cases, this is the only information you will need in order to get your Comet up and running with communication software, and to start making connections with your Comet.

Understanding AT Commands

The Comet communicates asynchronously with computers using AT commands. AT commands are used to configure and control the Comet. Commands are usually sent to the modem by way of communication software, but can also be entered manually with the computer keyboard.

Command statements must be written in a specific form in order for the Comet to recognize them. A command statement always begins with the letters AT or at. It is then followed by one or more commands and the <Enter> key.

AT commands can only be issued when the Comet is in “ command mode” or “ off- line.”

Once the Comet has established a connection with another modem it is said to be “ on- line” or in “ data mode.” In this mode, the characters sent to the Comet by your computer are transmitted to the remote modem rather than being interpreted by the Comet as commands.

Using the Windows 95 Hyper Terminal Program

In order to issue an AT command statement, you first need to run a communication program such as the Microsoft Windows “ Hyper Terminal” program. This program provides a simple method to manually enter AT commands so you can do such things as “ customize” the settings of your Comet, or store phone numbers you will commonly connect to.

Once the Comet is connected to your computer’ s serial port and telephone line, Open the Windows 95 “ Accessories” program group, and open the Hyper Terminal Program.

The program will prompt you for a name and Icon to use for your new connection. Type the name Test Connection and press <Enter>.

Next, you will be prompted for country information, area code, and phone number, and the device used to make the connection. For this test purpose, do not enter a phone number; simply choose the COM port your Comet is connected to from the “ Connect Using” list. Click “ OK” when finished.

Basic Modem Operation 5

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ZyXEL Communications 3356P Basic Modem Operation, Understanding AT Commands, Using the Windows 95 Hyper Terminal Program
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3356P specifications

ZyXEL Communications 3356P is an advanced networking device designed primarily for small to medium-sized businesses that require reliable connectivity and efficient performance. This versatile product combines switching and Power over Ethernet (PoE) capabilities, making it a significant addition to any network infrastructure.

One of the standout features of the ZyXEL 3356P is its PoE functionality. This device supports Power over Ethernet, allowing it to deliver electrical power along with data to connected devices such as IP cameras, VoIP phones, and wireless access points. With a total power budget of 65 Watts, the switch can adequately support multiple PoE devices simultaneously, simplifying deployment and reducing the need for additional power outlets.

The ZyXEL 3356P is equipped with 24 Gigabit Ethernet ports, ensuring high-speed data transfer and reducing network bottlenecks. The use of Gigabit technology allows for significantly improved bandwidth, which is crucial for businesses that rely heavily on data-intensive applications like video conferencing and large file transfers. Additionally, the switch operates with a non-blocking architecture, providing full duplex communication for maximum throughput.

ZyXEL's 3356P is focused on security and management, featuring advanced Layer 2 and Layer 3 switching capabilities. It supports VLAN tagging, which allows for the segmentation of network traffic and enhancements in security. This function helps maintain performance and reduces the risk of unauthorized access to sensitive information.

Traffic management is further enhanced with Quality of Service (QoS) protocols. This functionality prioritizes essential traffic, ensuring that critical applications receive the necessary bandwidth while less urgent data transfers are handled appropriately. This feature is particularly beneficial for businesses that demand seamless connectivity and consistent performance from their networks.

The device also comes with built-in network management capabilities, allowing network administrators to monitor performance and configure settings quickly. With support for both Web-based management and Simple Network Management Protocol (SNMP), the ZyXEL 3356P provides flexibility in administration, making it user-friendly for both IT professionals and less tech-savvy individuals.

Overall, ZyXEL Communications 3356P is an exceptional choice for organizations looking for a reliable, feature-rich networking solution. With its robust performance, PoE capabilities, advanced security features, and ease of management, it stands out as a reliable foundation for a scalable and efficient network.
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