Problem Solving

 

 

 

 

 

 

Table A-3. LED States

 

 

 

 

 

Symptom

Probable Cause

Corrective Action

 

 

 

 

 

 

 

 

 

Serial Port 1 or

There is low serial port

Ensure that serial port activity

 

Serial Port 2

activity or no serial port

is present. If the Serial Port

 

Activity LED is

activity.

Activity LED still fails to turn

 

off.

 

on, then turn the unit off by

 

 

 

removing it from the power

 

 

 

supply. Check that the Serial

 

 

 

Port Activity LED blinks

 

 

 

during the LED powerup self-

 

 

 

test.

 

 

 

If the Serial Port Activity LED

 

 

 

blinks, then the Serial Port

 

 

 

Activity LED portion of testing

 

 

 

has passed. If the Serial Port

 

 

 

Activity LED still fails to turn

 

 

 

on, then the router is defective.

 

 

 

 

 

 

Ensure that the cable

Replace the router.

 

 

has activity on it. If the

 

 

 

LED still fails to turn

 

 

 

on, then the port is

 

 

 

defective.

 

 

 

 

 

 

Console

Wrong cable.

Try connecting the console

 

terminal does

 

terminal to the router using a

 

not appear work.

 

null modem cable with the

 

 

 

appropriate 8-pin MJ RS232

 

 

 

connector on the router end.

 

 

 

 

 

 

Wrong baud rate.

Send a BREAK to the console

 

 

 

and then press <Return>

 

 

 

several times until the console

 

 

 

responds. Proper baud rates are

 

 

 

300, 1200, 2400, 4800, 9600,

 

 

 

19200, and 38400.

 

 

 

 

 

 

Defective router.

Replace the router.

 

 

 

 

A-9

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Cabletron Systems 520, 510 manual Symptom Probable Cause Corrective Action

510, 520 specifications

Cabletron Systems was a prominent player in networking technology during the late 20th century, particularly known for its innovative products aimed at improving data transmission capabilities in enterprise environments. Among its notable offerings were the Cabletron Systems 520 and 510 series, which stood out for their advanced features and robust performance.

The Cabletron 520 was designed to enhance network efficiency and reliability, serving as a multiport bridge or router. Its architecture supported a range of network protocols, allowing organizations to seamlessly integrate various devices and systems. The 520 series was particularly noted for its ability to manage traffic efficiently, thanks to its built-in packet filtering and forwarding capabilities. This made it an ideal choice for enterprises looking to streamline their network operations while ensuring high availability.

In contrast, the Cabletron 510 served as a versatile switching device capable of supporting Ethernet and Token Ring technologies. The 510 model featured multiple ports, facilitating extensive connectivity options that enabled a greater number of users to access network resources simultaneously. Its ability to dynamically allocate bandwidth was a key characteristic, ensuring that critical applications received the necessary resources while minimizing latency for other users.

One of the standout features of both models was their scalability. Organizations could begin with a certain number of ports and expand their network infrastructure as needed without requiring a complete overhaul. This flexibility was crucial for businesses experiencing growth or changes in their networking needs.

Security was another area where the Cabletron systems excelled. They incorporated several hardware and software mechanisms for secure data transmission, including support for virtual LANs (VLANs) and access control lists (ACLs). These features allowed administrators to define rules for data traffic, enhancing the overall security posture of the network.

Overall, Cabletron Systems’ 520 and 510 series represented a significant advancement in networking technology during their time. With their focus on performance, scalability, and security, these products offered organizations the tools they needed to build and maintain efficient and reliable networks. The innovations introduced by Cabletron set a high standard, influencing the development of subsequent networking devices and technologies.