Local Charging Prevention

prevents calls (if Y) from being charged to this port. Incoming calls from the network with Reverse Charging specified will be rejected; outgoing calls will have Reverse Charging inserted if it is not already in the call packet.

Reverse Charge Acceptance

authorizes transmission of incoming calls that request the X.25 Reverse Charging facility. If N is selected for this parameter and a call requests Reverse Charging, the call will not be transmitted.

Fast Select Acceptance

authorizes transmission of incoming calls that request the X.25 Fast Select facility.

Incoming Calls Barred

is an X.25 facility that prevents transmission of incoming calls to this port.

Outgoing Calls Barred

is an X.25 facility that prevents transmission of outgoing calls from this port.

Maximum Packet Size

is the maximum data packet size that will be allowed to pass through this port. A packet size included in a call setup packet will be used, as long as it is smaller than the maximum specified here.

Default Packet Size

will be assigned to an incoming call setup packet if the packet does not include a packet size. A packet size of 512 bytes is imposed on all protocols except X.25 between the PAD port and the logical port. The Default Packet Size is used for trans- mission out the logical port. (X.25 traffic uses the Maximum Packet Size configured on the X.25 port.)

Multiple packet sizes (e.g., multipoint SDLC-to-QLLC) require either mul- tiple logical ports or X.25 address translation (see page 8-27)(which allows modification of facilities in Call Request packets).

Maximum Window Size

is the maximum number of sequentially numbered I-frames that can be waiting for acknowledgment by the (end-to-end) destination device. If this number is exceeded, no frames will be transmitted until an acknowledgment is received.

There is also a local level-3 window for X.25 traffic. This window will always be in effect unless the D-bit is set at the attached X.25 device.

Default Window Size

will be assigned to an incoming call setup packet if the packet does not include a window size.

Maximum Throughput Class

specifies the default throughput class that will be inserted into a Call Request packet if Throughput Class Negotiation is not enabled or if a throughput class is not requested in the Call Request. This value should not be higher than the line speed specified for the physical port.

Configuring X.25

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Cabletron Systems 1800 manual Local Charging Prevention
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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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