CHAPTER 4

TESTING AND LANVIEW

This section contains procedures to test the NB20E or NB25E Two Port Ethernet Bridge after it has been connected to the network. A description of the LANVIEW LEDs, the Forward Broadcast, and the Root Switch, is also provided.

4.1INSTALLATION CHECK-OUT

After the NB20E or NB25E is connected to the network, verify that packets can be passed between the two Ethernet network segments via the bridge. Two Ethernet node testers, such as Cabletron Systems' LAN-MD™, are required for this procedure to generate valid data packets.

Before you begin, test each Ethernet segment connected to the NB20E or NB25E to ensure that the segments meet IEEE 802.3 specification limits.

1.Move the Forward Broadcast switch on the front panel of the Bridge (Fig. 4-1) to the On () position. This will allow broadcast messages sent by the LAN-MDs to pass through the bridge.

2.Using a transceiver (1, Fig. 4-2) and an AUI cable, connect a LAN-MD (2) to one of the segments connected to the bridge (3).

3.Select and run test 6 - SERVER on this LAN-MD.

4.Verify that the Test Status PASS LED is lit and that the Status Code reads 000 or 001. If these two conditions are met, the LAN-MD is now the SERVER unit and will act as a packet echoer when used with another LAN-MD.

NB-25E

ETHERNET /IEEE 802.3 BRIDGING UNIT

WITH REMOTE LANVIEW® AND MANAGEMENT

ON LINE

STAND BY

BROADCASTFORWARD 1 0

ROOT 1

0

 

XMT

 

 

RCV

 

 

CP

 

 

POK

 

1

PORT

2

Figure 4-1 LANVIEW LEDs

4-1

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Cabletron Systems NB25 E, NB20E user manual Chapter Testing and Lanview, Installation CHECK-OUT

NB25 E, NB20E specifications

Cabletron Systems, renowned for its innovative networking solutions in the late 20th century, introduced the NB20E and NB25E series, which made a significant impact in the realm of network management and reliability. These devices were tailored for businesses seeking to enhance their network infrastructure with efficiency and reliability.

The NB20E is known for its robust performance in medium-sized network environments. It operates with an architecture that allows for seamless integration into existing networks, providing essential features that cater to both versatility and scalability. One of its standout functionalities is the support for multiple protocols, enabling organizations to harness various networking standards without the need for extensive alterations to their current setups.

On the other hand, the NB25E extends these capabilities further, offering enhanced throughput and a more comprehensive range of networking options. This makes it particularly suitable for larger businesses with growing networking demands. The utilization of advanced technologies, such as its embedded intelligence, ensures that the NB25E can efficiently manage and direct network traffic, thus minimizing latency and maintaining optimal performance even during peak usage times.

Both models provide essential characteristics such as a modular design, allowing for easy upgrades and maintenance. This modularity not only prolongs the lifespan of the devices but also provides flexibility for future expansions or modifications as business needs evolve. The systems support various interfaces, catering to diverse environments and ensuring easy connectivity to other networking equipment.

Security is a paramount concern in today’s interconnected world, and Cabletron Systems addressed this in the NB20E and NB25E series. The devices are equipped with advanced security features that protect against unauthorized access and ensure data integrity, providing peace of mind for organizations relying on critical data transmissions.

In addition to their technical advantages, both models offer user-friendly management software, making monitoring and control straightforward even for those with limited networking expertise. This ease of use ensures that companies can leverage their investment fully without requiring extensive training or resources.

In summary, the Cabletron Systems NB20E and NB25E series represent a significant leap in networking technology during their era. With advanced features, modular capabilities, and a commitment to security, these devices remain a noteworthy consideration for businesses looking to enhance their networks and prepare for future growth.