Retry Sequence Repeat Count, RNR Limit | Cabletron Systems FRX4000

SNA Status and Conﬁguration

Retry Sequence Repeat Count

This Þeld speciÞes the number of times a retry sequence will be repeated for the local SDLC link station. The default value for this parameter is 0.

RNR Limit

This speciÞes the length of time (in 1/100ths of a second) an SDLC link station will allow its adjacent link station to remain in a busy (RNR) state before declaring it inoperative. A value of 0 means there is no limit. The default value for this parameter is 18000.

Group Poll Address

This Þeld deÞnes the group poll address for this link station. If group poll is not in effect for this link station, the value should be 0.

Desired Operational State

This is the desired state of the SDLC station, Active or Inactive. The default value for this parameter is Active.

Desired State at Startup

This is the desired state at startup of the SDLC station, Active or Inactive. The default value for this parameter is Active.

Modulus

This parameter speciÞes the modulus for the SDLC link station. The modulus determines the size of the rotating acknowledgment window used by the SDLC link station pair. The default value for this parameter is 8.

Data Mode

Use this Þeld to specify whether communications mode with the adjacent link station is Half (two-way alternate) or Full (two-way simultaneous). The default value for this parameter is Half.

Support SIM, RIM Frames

This parameter determines whether the link station supports transmission and receipt of Set Initialization Mode (SIM) and Request Initialization Mode (RIM) control frames. The default value for this parameter is No.

Transmit-Receive Capabilities

This parameter controls the transmit-receive capabilities for this link station, two-way alternating (twa) or two-way simultaneous (tws). The selected value establishes the value of the transmit-receive capability indicator sent in the XID image to the adjacent link station.

Conﬁguring SNA Ports

7-17

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.

Cabletron Systems FRX4000 Retry Sequence Repeat Count, RNR Limit, Group Poll Address, Modulus

Models: 1800 FRX4000 FRX6000