EMM-E6 Ethernet User's Guide

CHAPTER 2: REQUIREMENTS / CONFIGURATIONS
2-6 EMM-E6 User’s Guide
2.1.4 Thin-net Network
When connecting a thin-net (coaxial) segment to your hub (via an
EPIM-C), ensure your network meets the following requirements:
• Cable Type - Use only 50 ohm RG-58A/U type coaxial cable for
thin-net cable segments.
• Length - The thin-net segment must not exceed 185 meters.
• Terminators - Terminate each end of a thin-net segment.
• Connectors - You can use up to 29 T-connectors throughout the
length of the cable segment for host connections.
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, contact Cabletron Systems Technical Support.
• Grounding - For safety, ground only one end of a thin-net segment.
Do NOT connect EPIM BNC ports to earth ground.
2.2 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-net segment to earth ground at more than one
point could produce dangerous ground currents.
CH1Book Page 6 Wednesday, March 20, 1996 7:48 AM