Blocked Port Flag

will cause the port to be enabled (N) or disabled (Y) at node IPL. The port will remain in that state until this parameter is changed or an on-line enable ([B], [B], [C] from the Main Menu) or disable ([B], [B], [A] from the Main Menu) is performed.

If set to Y, no backup DLCIs on this port will be used (even if the port is enabled via on-line port enable).

Line Speed

is the data transmission rate in bits per second, and the clock speed when the port is a physical DCE (i .e., the attached I/O cable is DCE). If this port is a physical DTE, specify the line speed that matches (as closely as possible) that of the device connected directly to the port.

Selecting this parameter for a CSU/DSU port will toggle between the two valid values of 56K bps and 64K Clear Channel.

Selecting this parameter for any other physical interface type will display a list of ranges. Press the letter corresponding to a range to display the valid speeds within that range. All possible speeds are:

75

150

300

600

1200

2400

4800

9600

14.4K

19.2K

24K

28.8K

38.4K

48K

56K

64K

72K

112K

128K

168K

192K

224K

256K

280K

320K

336K

384K

392K

448K

504K

512K

560K

576K

616K

640K

672K

704K

728K

768K

784K

832K

840K

896K

952K

960K

1.008M

1.024M

1.064M

1.088M

1.12M

1.152M

1.176M

1.216M

1.232M

1.28M

1.288M

1.344M

1.4M

1.408M

1.456M

1.472M

1.512M

1.536M

1.568M

1.6M

1.624M

1.664M

1.668M

1.728M

1.792M

1.856M

1.92M

1.984M

2.048M

 

If an RS-232 DCE port is directly connected to the DTE via the standard Cabletron cable, the maximum supported speed is 64K. If longer cabling is used, the maximum speed is 19.2K. (The EIA standard for RS-232 addresses speeds up to 19.2 Kbps.)

Maximum Bytes per Frame

specifies the maximum size of any I-frame (Information frame) that can be transmitted or received on the port.

Logical DCE

defines the port as (if Y) logical DCE or (if N) DTE. The port must be configured as the opposite of the device at the other end of the connection.

Logical and physical DCE/DTE are independent of each other (e.g., a port can be a physical DCE and logical DTE).

Generate Clock

specifies whether the port will generate the clock necessary to synchronize traffic over the link. If the port is a physical DCE (determined by the port's I/O cable interface), set this parameter to Y, since the physical DCE generates clock. If the port is DTE, set the parameter to N.

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SmartSwitch 1800 4. 0 User Guide, Rev 01

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Cabletron Systems 1800 manual Blocked Port Flag
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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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