17, Line Delete

is the ASCII value of the character that will delete all characters stored in the editing buffer.

18, Line Display

allows the DTE to display the contents of the PAD's buffer on a new line. The spec- ified number defines the ASCII character that will be used as the Line Display char- acter.

19, Edit Service Signal

allows the DTE to specify the format of service signals. Values (can be added) are:

0 = no editing.

1 = edit signals for printing terminals.

2 = edit signals for display terminals.

8,32–126= edit signals using one of these (decimal) ASCII characters.

If parameter 6, PAD Service Signal, is set to 0, this parameter does not apply.

20, Echo Mask

allows selected sets of characters received from the user's device to avoid transmission back to the start-stop mode DTE. Values (can be added) are:

0 = no echo mask (all characters echoed).

1 = no echo of CR.

2 = no echo of LF.

4 = no echo of VT, HT, FF.

8 = no echo of BEL, BS.

16 = no echo of ESC, ENQ.

32 = no echo of ACK, NAK, STX, SOH, EOT, ETB, ETX.

64 = no echo of editing characters as designated by parameters 16-18. 128 = no echo of all characters not mentioned above and DEL.

If parameter 5, 12, or 22 is set to anything other than 0, X-ON and X-OFF are not echoed. If parameter 2 is set to 0 , parameter 20 does not apply.

21, Parity

allows the PAD to check parity in the data stream from the user's device and/or to gen- erate parity in the data stream to the user's device:

0 = no parity.

1 = parity checking.

2 = parity generation.

3 = checking and generation.

22, Page Wait

specifies the number of line feed characters that, when sent by the PAD to the DTE, will start a Page Wait condition, suspending transmission of additional characters to the user's device.

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1800 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.
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