Modem Result Codes

When you execute or try to execute an AT command, your modem sends a result code to let you know whether the command was executed. An OK result code means the AT command you sent was executed. If you receive an ERROR code, it means the command was invalid.

The Comet also provides result codes that show:

∙Whether or not a Dial Tone was detected when the modem originated a call.

∙If a busy signal was detected when the modem originated a call.

∙The speed, protocol, and error control/data compression method used.

∙If your modem has detected an incoming ring.

Result codes can originate from any of eight result code sets. The ATXn and ATWn command lets you choose which set of result codes your modem uses. By default, your modem uses result codes equivalent to the ATX4 and ATW2 command.

Viewing S Register Values

Status registers (or "S-registers") contain values that determine the modem’ s operating characteristics. Whenever you send an AT command to your modem, you are actually changing the value of an S-register.

You can use the Sr? command to view the value of S-register ‘ r’ . For example, to view the value of S-register S0, which controls auto-answering, type ATS0? and press Enter. The modem responds with a three-digit character showing the value of this register, followed by OK. A value of 002, for example, means your modem will auto- answer incoming calls after the second ring.

Changing S Register Values

You can use the ATSr=n command to change the value of an S-register r.

For example, to have your modem auto-answer an incoming call after two rings, set S- register 0 to 2. Be sure the n value is between 1 and 255. If n is set to 0, your modem will not answer incoming calls.

Non-Volatile Memory

The Comet has memory set aside for storing user information such as frequently used phone numbers and default command settings. This section covers the topics of storing phone numbers, and saving default settings in the power-on profile.

Storing Phone Numbers

The AT command to store a phone number is in the format AT&Zs=n.

Basic Modem Operation 9

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ZyXEL Communications 3356P Non-Volatile Memory, Modem Result Codes, Viewing S Register Values, Changing S Register Values
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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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