Command

bit

dec

hex

Function and description

Ref.

 

 

 

 

0.5 seconds at carrier loss

 

S43=

bit

dec

hex

Bit mapped register

+000

 

0

1

1

Disable ZyXEL 16800 in Multi-

&N0

 

 

 

 

Auto mode

 

 

1

2

2

Disable ZyXEL 19200 in Multi-

&N0

 

 

 

 

Auto mode

 

 

2

4

4

Disable cellular mode automatic

&N0

 

 

 

 

transmit power adjustment (see

 

 

 

 

 

also S49b0-3)

 

 

3

0

0

Enable cellular mode in Multi-

&N0

 

 

 

 

Auto mode.

 

 

 

8

8

Disable cellular mode in Multi-

&N0

 

 

 

 

Auto

 

 

6

64

40

Enable 1.5 sec, pause between

 

 

 

 

 

off-hook and modem answering

 

 

7

128

80

Modem hang-up if the line

 

 

 

 

 

condition does not permit

 

 

 

 

 

modem to run highest speed set

 

 

 

 

 

by ‘&Nn’ command

 

S44=

bit

dec

hex

Bit mapped register

+000

 

3

8

8

ATDSn initiates auto-dial of the

DSn

 

 

 

 

stored numbers consecutively

 

 

 

 

 

until connection is made

 

 

4

16

10

DSR follows DTR (see also

&S1

 

 

 

 

S41.5)

 

 

5

32

20

Enable V.13 half-duplex

 

 

 

 

 

simulation in synchronous mode

 

 

6

64

40

When selected with ‘&B0’, DTE

&Bn

 

 

 

 

speed fixed at 38400 when the

 

 

 

 

 

link speed is above 9600. DTE

 

Status Registers & Result Codes 119

Page 133
Image 133
ZyXEL Communications U-336SA user manual Status Registers & Result Codes

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.