Storing Phone Numbers

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

The ‘s’ is a number from 0 to 49 that represents the location in memory that the phone number is to be stored, and the ‘n’ is the phone number itself.

Example: To store the number ‘1-714-555-1212’ in memory location ‘2’, type:

AT&Z2=17145551212<Enter>

You can store up to 50 telephone numbers.

Dialing Stored Phone Numbers

The AT command syntax used to dial a stored number is ATDS=n.

The ‘n’ is the memory location of the stored number you want to dial.

ONOTE: AS A GENERAL RULE, WHEN A LETTER IN AN AT COMMAND DEFINITION IS SHOWN IN ITALIC TYPE, THE LETTER IS NOT TO BE ENTERED AS PART OF THE

COMMAND, BUT RATHER IS REPRESENTATIVE OF A NUMBER OR STRING EXPECTED AS INPUT. FOR EXAMPLE: THE LETTER ‘S’ IN THE ATDS=N COMMAND IS ACTUALLY TYPED, UNLIKE THE ‘S’ IN THE AT&ZS=N COMMAND WHICH REPRESENTS A NUMBER.

Saving Settings and User Profiles

There are some cases where you may wish to save the settings you have made as the default settings that are recalled when your modem is powered up. The AT&WZ command selects the current settings as the power-on profile.

There are four profiles that can be changed by the user, and one factory default profile. The following table lists the syntax for the commands involved in storing, recalling, and viewing profile settings:

Basic Modem Operation 21

U-336S, U-336SA specifications

ZyXEL Communications, a leading global provider of networking and cybersecurity solutions, has offered a range of products designed to cater to various connectivity needs. Among these, the U-336SA and U-336S modems stand out for their reliability and performance, particularly in the dial-up category during the heyday of internet access.

The U-336SA and U-336S modems are external devices that revolutionized the way users connected to the internet in the late 1990s and early 2000s. Designed for both home users and small businesses, these modems supported 33.6 Kbps data transfer rates, which, at the time, were considered cutting-edge. This capability allowed for reasonably swift internet browsing, email communication, and file downloads compared to earlier modems.

One notable feature of both the U-336SA and U-336S models is their plug-and-play functionality. This ease of use made them accessible to even the less tech-savvy users, allowing quick and straightforward installation. Users could connect the modems to their PCs or laptops via a standard serial interface, minimizing setup time and complexity.

Additionally, both modems were equipped with error correction and data compression technologies. The V.42 and V.42bis protocols enhanced data integrity during transmission, ensuring that users experienced fewer disruptions and greater reliability in their connecting experience. This was particularly vital for tasks like file transfers and large downloads, where data integrity was paramount.

The modems also featured compatibility with various operating systems, including early versions of Windows, which expanded their appeal to a broader audience. The U-336SA was specifically engineered as a standalone device, while the U-336S could often be used with existing computer systems, showcasing versatility in various deployment scenarios.

In terms of design, both modems were compact and lightweight, allowing for easy portability. This made them suitable for users who required connectivity on the go or in different locations.

Ultimately, the ZyXEL U-336SA and U-336S modems represent a significant technological achievement in the history of internet connectivity. Their introduction set the stage for subsequent advancements in modem technology and played a crucial role in the evolution towards broadband and high-speed internet access that we enjoy today. Their legacy endures in the foundational technologies and protocols that continue to drive modern telecommunications.

ZyXEL Communications U-336SA user manual Storing Phone Numbers, Dialing Stored Phone Numbers

Models: U-336S U-336SA