Autocall Delay

causes a delay after the link comes up before a Call Request will be issued.

Called Address

is the ID of the remote device, and is placed into the called address field of the Call Request. This parameter is relevant only if Autocall is Y; if Autocall is N, the called address will come from either the user device’s X.28 interface or an abbreviated address.

If the async port is one end of a connection to a logical X.25 port in the SmartSwtch, the Called Address must match a Subscriber ID (see page 12-15) configured for the logical port.

Retry Count

is the number of times an autocall will be sent to the remote device.

Retry Interval

is the time between autocall attempts.

User Data

is an (optional) string of ASCII characters that will be placed verbatim into the user data field of an outgoing Call Request packet.

Facilities

is an (optional) string of facility codes and related data that will be placed verbatim into the facility field of an outgoing Call Request packet.

DTR/RTS Active When VC Up

if Y means that DTR and RTS will be asserted only after a virtual circuit is established. If N, both signals will be asserted as soon as the port is enabled.

Input Signal Detection

determines which signal(s) will be read to determine that the link is up:

0 = none required

1 = DSR

2 = DSR & DCD

3 = DSR & DCD & Call

4 = DSR & CTS

5 = DSR, DCD, & CTS

RTS-CTS H/W Flow Control

enables hardware flow control through stop/start of data using RTS (pin 4), CTS (pin 5), and CD (pin 8) on the RS-232 interface. Flow control is usually necessary to maintain communication without data loss between devices or channels with different throughput capabilities.

RTS-CTS flow control works only on a physical DTE port, as physical DCE ports have RTS looped back internally to CTS .

The other common method of flow control is XON-XOFF (parameters 5 and 12 of the async PAD profile); however, when the data itself is likely to contain these characters (for example, in a binary file), XON-XOFF may become inadequate.

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SmartSwitch 1800 4. 0 User Guide, Rev 01

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Cabletron Systems 1800 manual Is the time between autocall attempts
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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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