Equivalent AT Commands:

ATD1234567

Dial phone number.

Manual Dial

Use of a telephone set to make a call, in which case an answer tone comes back, is normally called Manual Dial. Once the other side answers, access O (Originate) by using the left or right arrow key so the blinking cursor settles on the O. Then press the ENTER key to start the modem handshaking sequence.

Equivalent AT Commands:

ATD

Go on-line in Originate mode.

When dialing a person, use the telephone to make the call. When someone on the other side answers, decide who will be the Originate modem and who will be the Answer modem. Once an agreement is reached, use the left or right arrow key to select the O or A for Originate or Answer. Then press the ENTER key to start the modem handshaking sequence.

Equivalent AT Commands:

ATD

ATA

Go on-line in Originate mode.

Go on-line in Answer mode.

When you want to switch from modem to voice communication, simply lift up the handset of both sides and press the ENTER key while the blinking cursor is on the H or Hang Up. The LCD display will show DISCONNECTING? to ask for a confirmation. Press ENTER again and the modem will change from data to voice communication. When both sides wish to return to data communication, one side should press O while the other side presses A (as explained previously). This

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ZyXEL Communications U-336SA user manual Manual Dial, Atd Ata

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.