N3 Monitored Events Count

Rcv Clock (TT) from DTE

allows the clock to be looped back from the DTE using the TT (Terminal Timing) signal, which can be helpful on high-speed lines. Generally, if the local interface is physical DCE and the line speed is above 256 Kbps, this parameter should be set to Y. (Make sure the remote DTE is configured to provide the terminal timing.)

CSU/DSU Operating Mode

determines whether the attached modem connection can be normal or limited distance (LDM), where the distance depends on the wire gauge, number of splice points, and line speed. For example, 26-gauge wire and a line speed of 64K bps allows a distance of 15000 feet. Lowering the speed to 56K increases the allowable distance to 18400 feet . If 19-gauge wire is used, the distances can be multiplied by three.

RTS Control

if configured as Constant means that RTS (Request to Send) will always be asserted; if configured as External, the CSU/DSU will control RTS.

Link Layer Management

determines whether, and what type of, configurable network management (e.g., status enquiries to the port) will be used: none, LMI (Local Management Interface), or ANSI T1.617 Annex D (an ANSI-standard LMI).

N1 Polling Count

specifies the number of polling cycles between requests for Full Status reports, which include status of all PVCs on the physical link. Every "T1" seconds (see "T1 Link Integrity Timer" on page 7-17), the logical DTE will send a Status Enquiry to the network, requesting status of the network link. Each exchange of one enquiry and one message (response) is a polling cycle. After every "N1" cycles, an enquiry for a Full Status report will be sent.

If this port is configured as logical DCE, status enquiries will be initiated at the DTE, and the local node will respond with status messages.

N2 Error Threshold

is the number of link reliability and/or protocol errors that can occur during the period

defined bybefore the logical DCE will be declared inactive.

N3 Monitored Events Count

is the number of error-free polling cycles after which the DCE will be declared active if the first poll resulted in an error. If the first poll was error free, the DCE will be declared active after that poll. (If the N2 Error Threshold is exceeded during the N3 count, the DCE will be declared inactive, and the N3 count will be restarted.)

T1 Link Integrity Timer

determines how often the logical DTE will initiate a Status Enquiry message to the DCE.

T2 Polling Verification Timer

indicates how long the logical DCE will wait between Status Enquiry messages from the DTE before recording an error.

FRM Configuring Frame Relay

7-17

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Cabletron Systems 1800 manual Rcv Clock TT from DTE
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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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