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Network Cable Requirements
NBR-SERIES Installation Guide Page C-5
- Network propagation delay is the amount of time it takes a packet
to travel from the sending device to the receiving device. Total
propagation delay for the entire network must not exceed 25.6 µs
in one direction (51.2 µs round trip). If the total propagation delay
exceeds 25.6 µs, you must use bridges.
• Length - If you meet all system budgets, the maximum single mode
fiber optic cable length can reach 5 km (3.1 miles) with bridges at each
segment end. However, IEEE 802.3 FOIRL specifications specify a
maximum of 1 km (1093.6 yards).
C.1.4 Thin-Net Network
When connecting a thin-net (coaxial) segment to an EPIM-C, ensure your
network meets the following requirements:
• Cable Type - Use only 50 ohm RG58A/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 tee-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.
Connecting a thin-net segment to earth ground at more than
one point could produce dangerous ground currents.