Cabletron Systems EMM-E6 C.1.4 10BASE2 Coaxial Cable Network, C.1.5 Transceiver Requirements

Network Requirements

•Length: If you meet all system budgets, the maximum single mode fiber optic cable length can reach 5 Km (3.1 miles) with bridges or switches at each segment end. FOIRL specifications specify a maximum of 1 Km (0.62 miles).

C.1.4 10BASE2 Coaxial Cable Network

When connecting a thin coaxial cable segment to your hub (using an EPIM-C), ensure your network meets the following requirements:

•Cable Type: Use only 50 ohm RG-58 A/U type coaxial cable for thin coaxial cable segments.

•Length: The thin coaxial cable segment must not exceed 185 meters.

•Terminators: Terminate each end of a thin coaxial cable segment.

•Connectors: You can use up to 29 T-connectors throughout the length of the cable segment for host connections. Ensure that all connections are spaced 0.5 meters or more from one another or from terminators.

If you use an excessive number of barrel connectors within the cable segment (e.g., finished wall plates with BNC feed-throughs), you may need to reduce the number of host connections. For special network design information, contact Cabletron Systems Technical Support.

•Grounding: For safety, ground only one end of a thin coaxial cable segment. Do NOT connect EPIM BNC ports to earth ground.

Connecting a thin coaxial cable segment to earth ground at more than one point could produce dangerous ground currents.

C.1.5 Transceiver Requirements

When you connect an external network segment to an EPIM-A in your hub through a transceiver, that transceiver must meet IEEE 802.3 standards or Ethernet version 1.0 or 2.0 requirements. The transceiver must also have SQE disabled.

EMM-E6 Installation Guide C-5