Cabletron Systems EMM-E6 - Manual (Page 59)

Network Requirements
EMM-E6 Installation Guide C-5
• 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.
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.
Connecting a thin coaxial cable segment to earth ground at
more than one point could produce dangerous ground currents.
ICH1Book Page 5 Tuesday, August 6, 1996 3:06 PM