Controller Type

A = Use this if you don't care or are not sure which type to select.

B = 2780 C = 3780 D = 3740 E = 2770

F = 3770

Full Duplex

specifies full-duplex transmission (both directions at once). Currently, this must be configured as Y.

# of Beginning Sync Chars

specifies the number of synchronization characters that will be added to the beginning of each frame.

# of Trailing Pad Chars

specifies the number of padding characters that will be added to the end of each frame, to ensure that the last significant character is sent before the data transmitter switches off.

No Response Timer

is activated after transmission of a general poll or a data frame. On expiry, a NAK– EOT–General Poll sequence is transmitted, and the No Response Retry Count is incre- mented. The timer will be de-activated on reception of any valid frame from the line during Link Down.

No Response Retry Count

specifies how many times the user device will be polled (if it is not responding) before control is passed on the next cluster (accompanied by other condition checks).

Delay Timer

is activated when the application queue is empty; i.e., when data from the network is pending. On expiry, a TTD (Temporary Text Delay) is sent and the timer is restarted. After the final retry, an EOT is sent to the line, and a Clear Request is sent to the network.

Delay Retry Count

specifies the number of times the node will retransmit a TTD when there is no data pending from the network. Once the count reaches the specified value, the node will issue an EOT and clear the virtual circuit.

NAK Retry Count

specifies the number of times the node will send a frame when the receiving device is unable to acknowledge; that is, returns a NAK to the node.

VC to be Cleared After Disc

specifies whether the virtual circuit will be cleared after completion of a file transfer.

Idle Timer

is activated on reception of an EOT from the line. On expiry, an EOT is sent to the line and a Clear Request is sent if VC to Be Cleared After Disc is Y.

11-6

SmartSwitch 1800 4. 0 User Guide, Rev 01

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Cabletron Systems 1800 manual = 2780 C = 3780 D = 3740 E =
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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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