Command

bit

dec

hex

Function and description

Ref.

 

 

24

18

ATX3

X3

 

 

32

20

ATX4

X4

 

 

40

28

ATX5, error control result code

X5

 

 

 

 

enabled (Default)

 

 

 

48

30

ATX6, error control result code

X6

 

 

 

 

enabled

 

 

 

56

38

ATX7, error control result code

X7

 

 

 

 

enabled

 

 

6

0

0

Display result code in numeric

V0

 

 

 

 

format (see S35.7)

 

 

 

64

40

Display result code in verbose

V1

 

 

 

 

format

 

 

7

0

0

Modem returns result code

Q0

 

 

128

80

Modem does not return result

Q1

 

 

 

 

code (see also S40.1)

 

S24=

bit

dec

hex

Bit mapped register

 

 

2-0

0-7

0-7

Ring Volume control, increment

N0-7

 

 

 

 

of 2 in decimal value

 

 

6-4

16-

10-

Speaker volume control,

L0-7

 

 

112

70

increments of 32 in decimal value

 

S25=

 

0-

0-FF

Specify the time delay that DTR

+000

 

 

255

 

signal needs to be OFF before it

 

 

 

 

 

will be recognized, in 10 ms

 

 

 

 

 

units. If S25=0, the delay time is

 

 

 

 

 

set to 4 ms

 

S26=

 

dec

hex

RTS/CTS delay

+000

 

 

0-

0-FF

Set the delay, in 10 millisecond

&Rn

 

 

255

 

units between the RTS and

 

 

 

 

 

modem’s CTS response in

 

 

 

 

 

synchronous mode (see ‘&Rn’

 

112 Status Registers & Result Codes

Page 126
Image 126
ZyXEL Communications U-336SA user manual ATX3 ATX4

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.