X.25 Line Monitor

The X.25 line monitor is used to monitor X.25, SDLC, BSC, and async ports. The fol- lowing figure shows an example.

09:23:05:16

I

DA TA

LCN 4072

PR 4

PS 4

LNG 1024:56686520756190G801

09:23:05:27

I

DA TA

LCN 4072

PR 4

PS 5

LNG 1024:46686521255190G811

09:23:05:27

I

RR

LCN 4071

PR 6

PS

 

09:23:06:05

O

RR

LCN 4072

PR 6

PS

 

09:23:06:18

O

DA TA

LCN 4072

PR 6

PS 6

LNG 1024 :557586707555090G85

09:23:07:13

O

DA TA

LCN 4071

PR 6

PS 7

LNG 1024 :54389450758090G859

 

 

 

 

 

 

 

Figure 20-6 X.25 Line Monitor Display

[C],[E] from Main Menu

Information in this Display

On each line:

●The leftmost field shows the time, to hundredths of a second.

●The next field displays I (Incoming) or O (Outgoing). (Outgoing packets are also displayed in reverse video.)

●The next field identifies the packet type.

●D, M, or Q appears between the packet type and the LCN field if the D, M, or Q bit is turned on in the packet.

●LCN is the logical channel of a data session.

●PR is the packet receive sequence number.

●PS is the packet send sequence number.

●LNG is the length of the data in bytes.

●The field to the right of the colon contains the data in a data packet. (Data exceeding the screen width is displayed on the next line.)

Status Displays

20-9

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Cabletron Systems 1800 manual X.25 Line Monitor Display
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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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