Restart Retry Count

T23 Clear Timer

will be started when the port issues a Clear Request, and stopped (and reset) when a Clear Confirmation or Clear Indication is received. If the timer expires, the port will retransmit the Clear Request.

DTE Restart Retry Count

is the number of times a Restart Request from the logical DTE will be transmitted. (The DTE will stop issuing the request on receipt of a Restart Confirmation or Restart

Indication.) If theexpires, restart and recovery procedures should be initiated.

DTE Reset Retry Count

is the number of times a Reset Request from the logical DTE will be transmitted. (The DTE will stop issuing the request on receipt of a Reset Confirmation or Reset Indi- cation.) If the Reset Retry Count expires, restart and recovery procedures should be ini- tiated.

DTE Clear Retry Count

is the number of times a Clear Request from the logical DTE will be transmitted. (The DTE will stop issuing the request on receipt of a Clear Confirmation or Clear Indi- cation.) If the Clear Retry Count expires, recovery procedures should be initiated.

CUG Parameters

Preferential CUG Flag

specifies whether the port has a preferential CUG if the port belongs to any CUGs.

Preferential CUG

is a default CUG for the port. Any calls that do not specify a CUG will default to this one if Preferential CUG Flag is Y. A new port has CUG 0 specified here.

Incoming Access Allowed

determines whether this port will be allowed to receive calls from outside its CUGs.

Outgoing Access Allowed

determines whether this port will be allowed to make calls outside its CUGs.

Dial Port Parameters

Dial Support

specifies whether this port is connected to a dial modem and, if so, whether connec- tions will be initiated through dial-in or dial-out calls. (Signaling differences prevent configuration for both dial-in and dial-out on the same port.)

A dial-out port will establish a link only when an outgoing X.25 call is placed, at which time the port will raise DTR and the attached modem will dial a stored number to a remote modem to establish an X.25 connection. A dial-in port will establish a link only when a call is received.

If this port is configured as a network trunk, the value for Dial Support must be None .

Inactivity Timer

will be started as soon as there are no active connections on a dial port. (It has no function on a non-dial port.) If no new connections are established before the period

Configuring X.25

8-11

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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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