CALCULATING RING LENGTH
Page C-1
APPENDIX C
CALCULATING RING LENGTH
This Appendix presents methods for calculating cable lengths for
passive token ring networks or passive network segments giving
consideration to adjusted ring length (ARL). These calculations
differ between networks that are wholly contained within a single
wiring closet and networks spanning multiple wiring closets.
This appendix describes both network configurations. Be sure to use
the tables and instructions that apply to your network’s wiring when
calculating the cable lengths.
A subsection titled Formulas follows the cable length calculations.
These formulas are presented as a source of additional reference
information. They show how the tables on the Cable Length
Worksheets were compiled and are NOT needed for calculating your
cable lengths.
C.1 RULES FOR CALCULATING CABLE LENGTHS
Chapter 2, Requirements/Specifications lists information related
to the maximum lobe length, maximum drive distance, and
specifications for various cable types that can be used with your
Cabletron Systems’ token ring products. Refer to that chapter
whenever you have a question about recommended cable types or
cable lengths.
Several rules must be followed when using the tables and
instructions for ARL. They define the cable types and cable lengths
used for various segments of your token ring.
Rules:
• Internal closet wiring is Type 6 cable in the following lengths:
- 8 feet - Trunk coupling unit port to patch panel
- 8 feet - Patch panel to concentrator ring ports
- 8 feet - Concentrator to concentrator
- 30 feet - Rack to Rack.
