General Considerations

to re-route cabling away from potential noise sources, or to ensure that the electrical wiring in the area is properly wired and grounded, or to replace connectors along affected segments.

Temperature

The attenuation of PVC-insulated cable varies significantly with temperature. Check the cable manufacturer’s specifications. Plenum- rated cables are strongly recommended in areas where temperatures exceed 40˚C. Under such conditions, plenum-rated cables ensure that cable attenuation remains within specifications.

Installation Recommendations

In addition to complying with the cable specifications presented in Sections 2.2 and 2.3, the cabling installation should comply with the following recommendations to obtain optimum performance from the network:

UTP cabling should be free of splices, stubs, or bridged taps.

No more than two punch-down blocks should exist between TCU ports and wall outlets.

Metal troughs, ducts, etc. carrying Token Ring signals should be properly grounded.

Cables should be routed away from sources of electrical noise, such as power lines, fluorescent lights, electric motors, radio interference, and heavy machinery.

Token Ring signals should not be routed through UTP cables that exit a building or which are adjacent to cables either exiting a building or exposed to lightning strikes and power surges.

UTP cables that contain Token Ring signals should not be simultaneously used for applications which may impress high voltages (greater than 5 volts) with sharp rise or fall times, since the noise coupling from such signals could directly cause errors on the Token Ring network.

For single telecommunications closet rings, lobe lengths should not exceed 100 meters of 22 to 24 AWG wire from the attaching device and the TCU port.

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Cabletron Systems STH-22, STHI-44, 42, 24 manual General Considerations, Temperature, Installation Recommendations

42, 24, STHI-44, STH-22 specifications

Cabletron Systems was a pioneer in networking technology, and its STH series, particularly the STH-22 and STHI-44, 24, and 42 models, stand out in the history of networking equipment. These devices were designed for high-performance network management and offered a multitude of features that helped organizations manage their networking resources efficiently.

The STH-22 was a compact and efficient network switch, primarily developed to serve small to medium-sized businesses. One of its main features was its ability to support multiple user connections while offering low latency and high throughput. The STH-22 utilized advanced packet-switching technology to ensure data could move rapidly across the network, enhancing overall communication and productivity.

On the other hand, the STHI-44 model addressed the needs of larger enterprises. It featured advanced routing protocols and could handle a greater number of simultaneous connections, making it ideal for environments with high data traffic. The STHI-44 also incorporated redundancy features to minimize downtime, a vital requirement for businesses that relied heavily on continuous network availability.

The STH-24 and STH-42 models focused on versatility and scalability, catering to a broad range of networking needs. Both models provided extensive support for various networking protocols and featured robust hardware for enhanced durability. The STH-24 was designed for offices requiring mid-range capabilities, while the STH-42 targeted enterprises with more demanding networking requirements.

All STH series devices were built with ease of management in mind. They included user-friendly interfaces that allowed IT personnel to monitor traffic, configure network settings, and troubleshoot issues in real-time. Additionally, the devices supported SNMP (Simple Network Management Protocol) for seamless integration into existing network management systems.

Another defining characteristic of the Cabletron STH series was its commitment to security. These devices came equipped with features that permitted administrators to set access controls and monitor network activity, thereby safeguarding against unauthorized access and potential threats.

In summary, Cabletron Systems' STH-22, STHI-44, STH-24, and STH-42 models represent a significant advancement in networking technology. With their diverse features, high-performance capabilities, and user-centric design, they have served a critical role in optimizing network resources, ensuring businesses were equipped to handle increasing connectivity demands.