Switch User's Guide

Ethernet Cabling Requirements
CSX400 and CSX400-DC User’s Guide 53
Length — If your network meets 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. The FOIRL
specifies a maximum of 1 km (0.62 miles).
10BASE2 Coaxial Cable Network
When connecting a thin coaxial cable segment to the CSX400 (using an EPIM-C), ensure that your
network meets the following requirements:
Cable Type — Use only 50-ohm RG 58A/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.
Transceiver Requirements
When you connect an external network segment to an EPIM-A in your CSX400 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.
!
CAUTION
Connecting a thin coaxial cable segment to earth ground at more than one point could
produce dangerous ground currents.