BSC Interactive Configuration

Line Speed

This Þeld speciÞes the data transmission rate in bits per second. If this port is a physical DTE, specify the line speed that matches the speed of the device connected directly to the port. If the port is a physical DCE (i.e., the attached I/O cable is DCE) specify the clock speed of the serial port you are conÞguring. Valid values for this parameter are: 75, 150, 300, 600, 1200, 2400, 4800, 9600, 14400, and 19200. The default value for this parameter is 9600.

Retransmission Period

This is the length of time (in milliseconds) before the FRX or SmartSwitch 1800 will retransmit a data frame if the previous transmission of that data frame was not acknowledged. If the time expires, the timer will be reset, the data frame will be retransmitted, and the Max Retransmissions counter (see below) will be incremented.

The default value of 2000 milliseconds allows avoidance of unnecessary retransmission of frames that have merely been delayed.

Max Retransmissions

This is the maximum number of times the FRX or SmartSwitch 1800 will attempt to retransmit a data frame after the Retransmission Period (see above) expires. A larger value for this parameter increases the probability of an eventual successful transmission, but a smaller value permits faster detection of a permanent error condition. The default value for this parameter is 5.

Start Sync Chars

This is the number of synchronization characters that will be added to the beginning of each frame. The default value for this parameter is 2.

Trailing Pad Chars

This is the number of padding characters that will be appended to each frame. This ensures that the last signiÞcant character is sent before the data transmitter switches off. The default value for this parameter is 1.

Poll Interval

The amount of time (in milliseconds) between passes through the polling list. The default value for this parameter is 500.

No Response Timer

This timer begins after the FRX or SmartSwitch 1800 transmits a general poll or a data frame. It is the amount of time (in seconds) before the FRX or SmartSwitch 1800 transmits an NAK-EOT-General Poll sequence and increments the No Response Retries count (see below). The timer will stop upon receipt of any valid frame from the line. The default value for this parameter is 2.

No Response Retries

If a device is not responding to a poll, this count speciÞes how many times the device will be polled before the general poll sequence bypasses the device and moves on to the next one. The default value for this parameter is 5.

Configuring BSCI Ports

8-3

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Cabletron Systems FRX4000 Retransmission Period, Max Retransmissions, Start Sync Chars, Trailing Pad Chars, Poll Interval
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1800, FRX4000, FRX6000 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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