Output

Output Value Description

Parameter

 

 

Blocks Resent

Number of blocks resent due to remote modem

 

request. (If there were many blocks resent, you

 

may have experienced line trouble or protocol

 

incompatibility.)

 

Max Outstanding

Maximum blocks received without

 

acknowledgment by remote modem.

Max Block Size

Maximum octets contain in a block

Retrains

The number of times local modem requested

Requested

retrain.

 

Link Duration

Total link duration time (in minutes).

Retrains Granted

The number of times remote modem requested

 

retrain.

 

T401 Time-outs

For protocol maintenance, modem probably

 

recovered.

 

T402 Time-outs

For protocol maintenance, modem probably

 

recovered.

 

FCS Errors

Errors in frame (block) checksum. (If there were

 

many FCS Errors, you may have experienced

 

problems on the line.)

 

Round Trip

Time (Units 1/2400 sec.)

Delay

 

 

Xmitter Underrun

For modem's processor power measurement.

Receiver

For modem's processor power measurement.

Overrun

 

 

Disconnect

Local Hang-up

Remote Hang-up

Reason

 

 

 

Carrier Lost

On-Line (Not

 

 

disconnected)

 

Resent Expiration

Protocol Error

AT Command Set Summaries 93

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Image 107
ZyXEL Communications U-336SA user manual AT Command Set Summaries

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.