Command

Value

Description

+FBADLIN=

0-255

Bad line threshold (number of

<value>

 

consecutive bad lines for a bad page

 

 

parameter):

 

 

Determine if Copy Quality OK on the

 

 

T.30 flow chart . <value>=0 to 255; a

 

 

value of 0 implies that error checking is

 

 

disabled.

+FBOR=n

 

Phase C data bit order:

 

n=0

Select direct bit order.

 

n=1

Select reversed bit order in receiving

 

 

mode for phase C data.

+FBUF?

 

Buffer size; read only parameter:

 

 

Allow DTE to determine the

 

 

characteristics of the DCE’s buffer size.

+FCIG="string"

 

Local fax station ID string, for polling Rx.

+FCLASS=n

 

Service class selection: Refer to

 

 

+FCLASS Class 1 command in previous

 

 

section.

+FCON

 

DCE responds fax connection .

+FCQ=n

 

Copy quality check capability parameter

 

n=0

No copy quality check capability.

 

n=1

Only check 1D phase C data.

 

n=2

Check both 1D and 2D phase C data.

+FCR=n

 

"Capability to receive" parameter

 

n=0

DCE will not receive message data or

 

 

poll a remote device.

 

n=1

DCE receives message data or polls a

 

 

remote device.

+FDCC=vr,br,wd

 

DCE capabilities parameters.

,ln,df,ec,bf,st

 

 

 

vr=0

Vertical resolution: Normal; 98 lpi.

Fax Operation 69

Page 83
Image 83
ZyXEL Communications U-336SA user manual +Fbadlin=, +Fbuf?, +Fcon

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.