Command

bit

dec

hex

Function and description

Ref.

 

6

64

 

Enables type 4 ring detection

 

S41=

bit

dec

hex

Bit mapped register

+000

 

0

1

1

Special MNP compatibility (see

&Kn

 

 

 

 

also S27.0, S38.5)

 

 

2

4

4

Disable retrain abort, up to 5

S27.6

 

 

 

 

min. for special satellite line

*n

 

 

 

 

condition

 

 

3

8

8

Enable CCITT signals 140 and

 

 

 

 

 

141 on EIA-232D interface

 

 

4

16

10

In X2-X7 setting, modem waits

 

 

 

 

 

for S6 seconds before dialing

 

 

 

 

 

and ignores dial tone detection

 

 

5

32

20

DSR follows DCD and pulses

&Sn

 

 

 

 

for 0.5 sec DCD on-off

 

 

 

 

 

transition

 

 

6

64

40

Force S0>=2

S0

 

7

128

80

Ignore calling tone, not to be

 

 

 

 

 

used as fax detection

 

S42=

bit

dec

hex

Bit mapped register

+000

 

1

2

2

Enables throughput averaging

 

 

2

4

4

CND message will be forced on

 

 

 

 

 

even if AT02 is set

 

 

3

8

8

Disable escape sequence code in

 

 

 

 

 

answer mode

 

 

4

16

10

Disable V.17, 14,400 Fax in

 

 

 

 

 

calling mode, no effect to

 

 

 

 

 

answering mode &N32

 

 

5

32

20

Disable Data/Voice button

 

 

6

64

40

Disable ‘RINGING’ result code

Xn

 

7

128

80

DCD forced on but pulse off for

&C0

118 Status Registers & Result Codes

Page 132
Image 132
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.