Command

bit

dec

hex

Function and description

Ref.

 

 

 

 

speed fixed at 9600 if link speed

 

 

 

 

 

is 7200, DTE speed follows link

 

 

 

 

 

speed. When selected with &B1,

 

 

 

 

 

DTE speed fixed at current rate

 

 

 

 

 

when an ARQ connection is

 

 

 

 

 

made, when a non-ARQ

 

 

 

 

 

connection is made, DTE speed

 

 

 

 

 

follows the link speed. (See also

 

 

 

 

 

S18)

 

 

7

128

80

Enable UK (Australian,

 

 

 

 

 

Singapore, Indian, etc.,) type

 

 

 

 

 

short-to-short (discontinuous)

 

 

 

 

 

ring-back detection.

 

S45=

 

dec

hex

Delay during which the CND

+087

 

 

0-

0-FF

silence detection is disabled, in

 

 

 

255

 

20 ms units. (See also S46)

 

S46=

 

dec

hex

CND silence detection interval

+003

 

 

0-

0-FF

To process the CND, silence

 

 

 

255

 

must be detected for the

 

 

 

 

 

specified interval, in 20 ms units

 

S48=

bit

dec

hex

Bit-mapped register

+000

 

0

1

1

Cause CND information to be

 

 

 

 

 

reported in raw format

 

 

1

2

2

Enable DATA ONLY mode.

 

 

 

 

 

Auto-detect

 

 

 

 

 

V.34/ZyX/V.32bis/V.22bis/V.2

 

 

 

 

 

3/V.21 Bell 103 when

 

 

 

 

 

answering. If the connection try

 

 

 

 

 

fails, the modem will continuously

 

 

 

 

 

recycle the handshaking

 

 

 

 

 

procedure until the S7 register

 

120 Status Registers & Result Codes

Page 134
Image 134
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.