Operation

SmartSwitch ASIC

The SmartSwitch ASIC is a hardware-based switch design that is the key building block of the SmartSwitch 9000 hub. The SmartSwitch ASIC makes all filtering/ forwarding decisions in custom hardware as opposed to software like in traditional bridges. This custom hardware enables the SmartSwitch ASIC to process over 750K frames per second. The SmartSwitch ASIC is designed to support up to 64 ports, shared between the host processor, the INB backplane, and LAN/WAN interfaces on the front panel of SmartSwitch 9000 modules. The SmartSwitch ASIC can operate in two modes

•Traditional Switch - When operating as a traditional switch, the SmartSwitch ASIC makes filtering/forwarding decisions based on Destination Address (DA), with standard IEEE 802.1d learning.

•SecureFast Switch (SFS) - When operating as an SFS switch, the SmartSwitch ASIC makes all filtering/forwarding decisions based on a Destination Address-Source Address (DA-SA) pair and its receive port. These DA-SA pairs with the associated receive port are programmed into the switch using Cabletron’s SecureFast Virtual Network Server (SecureFast VNS). This provides the network administrator with the ultimate network security without the performance degradation found when using routers or bridges with special filtering capabilities. The SmartSwitch 9000 hub can support individual modules operating in the traditional switch mode or SFS mode providing security where needed.

i960 Core

The i960 core provides the SNMP protocol stacks, to support industry-standard MIBs. Additionally, Cabletron enterprise extension MIBs are supported for each media type. Advanced management services, such as the Distributed LAN Monitor, telnet and network address to MAC address mapping, are also provided by the i960 core.

The Host engine sends and receives packets via the CPU’s SmartSwitch ASIC Interface. This allows the bridge to perform spanning tree protocol and other bridging functions. The SMB Interfaces provide communication to the Host Engine for management functions.

INB NIB

Each module that attaches to the Internal Network Bus (INB) has an INB Network Interface Block (NIB). The INB NIB converts canonical frames to fixed length data blocks for transmission onto the INB. For data blocks received from the INB, the INB NIB reassembles the data blocks received from the INB back into canonical frames for transmission to the SmartSwitch ASIC then from the SmartSwitch ASIC to the front panel ports.

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Cabletron Systems 12 manual SmartSwitch Asic, I960 Core
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12 specifications

Cabletron Systems 12, widely regarded for its impact on networking technology in the late '80s and early '90s, has become a pivotal part of the history of data communications. This product marked a significant leap forward in the area of local area networking (LAN), blending reliability with advanced capabilities tailored for varied business needs.

One of the standout features of Cabletron Systems 12 is its ability to facilitate scalable networking solutions. It was designed with modularity in mind, allowing businesses to expand their network infrastructure as their needs evolved. This characteristic made it particularly appealing to organizations experiencing rapid growth, as it provided a cost-effective way to upgrade and add components without a complete system overhaul.

The architecture of Cabletron Systems 12 was based on a multi-layer switching technology. This approach enhanced the speed and efficiency of data transmission across the network. By employing a combination of hardware and software solutions, it minimized bottlenecks and ensured superior performance during high-traffic periods. Enhanced throughput made it suitable for a range of applications, from small businesses to enterprise-level networks.

Another significant feature was its support for a diverse set of network protocols, including Ethernet and Token Ring. This flexibility allowed organizations to integrate various networking technologies into a single cohesive system, thereby protecting their investment in existing infrastructure while still enabling new technology adoption.

The design of Cabletron Systems 12 also prioritized management and monitoring capabilities. With user-friendly interfaces and tools, network administrators could easily configure and manage their networks, enhancing overall operational efficiency. Real-time diagnostics and reporting features helped in troubleshooting and maintaining optimum network performance.

In addition to its performance-oriented features, Cabletron Systems 12 was also noted for its robust security protocols, which were crucial in an era where cyber threats were beginning to rise. Comprehensive security measures ensured that data integrity and privacy were maintained, providing peace of mind for organizations relying on digital communications.

Overall, Cabletron Systems 12 encapsulated the technological innovations of its time, offering a blend of speed, scalability, and security. Its ability to adapt to the changing landscape of networking set a precedent for future developments in the field, making it a noteworthy milestone in the evolution of communication technology.
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