Poll Interval Timer

specifies the time between passes through the polling list.

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).

Error Retransmit Count

specifies the number of times the node will resend a block of data after the receiving device has detected an error in that block.

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.

Explanations of Subscriber Parameters

Sq

is a sequence number, which eases selection of a line on the screen to change. To move to another line, press [A] and enter the sequence number.

Local Sub

is the calling address used by the local device. A Subscriber ID (see page 10-8) must also be configured for this address.

Remote Sub

is the called address used for calls by the local device. A Subscriber ID (see page 10- 8) must also be configured for this address.

If the BSC port is one end of a connection to a logical X.25 port in the SmartSwitch 1800, this address must match a Subscriber ID configured for the logical port.

Atcl

(Autocall) causes a BSC TPAD to automatically call its HPAD when the controller (identified by Link Address) becomes active. This parameter has no function if the port is an HPAD.

Rtytm

is the Retry Timer, which determines the time between autocall retries.

Rty #

is the Retry Number, which is the maximum number of times an autocall will be sent.

Conn ID

is an internal connection identifier that will link the BSC port with a device configured in the BSC Devices file (page 10-10).

Configuring BSC Interactive

10-7

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Cabletron Systems 1800 Explanations of Subscriber Parameters, Specifies the time between passes through the polling list
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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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