3000 ms

T1 Retransmit Period

is the length of time before transmission of an I-frame if the previous transmission is not acknowledged. If the period expires, the software will reset the timer and transmit a supervisory frame demanding immediate acknowledgment. Also, the Maximum Retransmissions (see that entry) counter will be incremented. The default value of

allows avoidance of unnecessary retransmission of frames that have merely been delayed.

T2 Wait Ack Period

is the length of time the node will delay acknowledgment of a received I-frame if there is no outgoing I-frame to be sent. If during this period the node receives an I-frame for transmission, the acknowledgment will be sent with it, and the delay timer will be reset.

T3 Link Alive Period

is the length of time after which the node will poll its counterpart if there is no data transfer.

Logical DCE

defines the port as (if Y) logical DCE or (if N) DTE. The other end of the connection must be the opposite of this port. Logical DCE/DTE is independent of physical. A node connecting a subscriber device into a network should normally be configured as logical DCE.

Lowest/Highest Incoming/Two -Way/Outgoing Channel

are the ranges of logical channel numbers (LCNs) that subscribers can use for calls through this port. The valid values for each parameter are determined as follows:

Channel

Valid Values

Lowest Incoming

1 through Highest Incoming

Highest Incoming

Greater than/equal to Lowest Incoming

Lowest 2-Way

Greater than Highest Incoming

Highest 2-Way

Greater than/equal to Lowest 2-Way

Lowest Outgoing

Greater than Highest 2-Way

Highest Outgoing

Lowest Outgoing through 4095

Changing any parameter to a value that violates this order automatically changes any other values now in violation, specifying the first value(s) within the valid range. If any pair is not used, its constraints apply to the next higher or lower pair (whichever is appropriate) in the above list.

Flow Control Negotiation

is an optional X.25 facility that permits negotiation of the flow control parameters (packet and window sizes for either direction of data transmission) on a per call basis. If N is selected, the default packet and window sizes will be used. If Y is selected, a packet and/or window size included in a call packet will be used. (If either is not included, the default for that parameter will be used.)

Throughput Class Negotiation

is an optional X.25 facility that permits negotiation of the throughput classes for either direction of data transmission on a per call basis. If N is selected, the default (Maximum Throughput Class) will be used. If Y is selected, any throughput class included in a call packet will be used. (If a class for either direction is not included, its default value will be used.)

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Cabletron Systems 1800 manual Lowest/Highest Incoming/Two -Way/Outgoing Channel
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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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