Command

Options

Function & Description

Ref.

 

I1

 

Display product information and

 

 

 

 

ROM checksum

 

 

I2

 

Display modem link status report

 

 

I12

 

Display physical layer status

 

Ln

n=0-7

Speaker volume control. The higher

S24.5-7

 

4 *

 

the value, the higher the volume

 

Mn

 

 

Speaker control

S21.1-2

 

M0

 

Speaker always OFF

 

 

M1

*

Speaker ON until call is answered

 

 

M2

 

Speaker always ON

 

 

M3

 

Speaker ON after the last digit is

 

 

 

 

dialed out and OFF when carrier is

 

 

 

 

detected

 

Nn

n=0-7

Ring volume control.'N0' will disable

S24.1-3

 

5 *

 

the audio ring function

 

O

 

 

Return to on-line state

 

O1

 

 

Force modem to request a retrain

 

Qn

 

 

Result code displayed

S23.7

 

Q0

*

Modem returns result code

 

 

Q1

 

Modem does not return result code

 

 

Q2

 

Modem returns result code but quiet

S40.1

 

 

 

after answering on a RING (see also

 

 

 

 

S42.2)

 

Sr.b=n

 

 

Set bit 'b' of S-register 'r' to value 'n'.

 

 

 

 

'n' is a binary digit '0' or '1'

 

Sr.b?

 

 

Display value of bit 'b' of S-register 'r'

 

Sr=n

 

 

Set S-register 'r' to value 'n'. 'n' must

 

 

 

 

be a decimal number between 0 and

 

 

 

 

255

 

Sr?

 

 

Display value stored in S-register 'r'

 

90 AT Command Set Summaries

Page 104
Image 104
ZyXEL Communications U-336SA user manual AT Command Set Summaries

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.