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Cable and Pin Information SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
Cabling Recommendations
The tables in this section contain the maximum supported lobe lengths. The
maximum lengths reflect the longest lengths supported by the transmission
characteristics of IEEE 802.5-compliant adapters. The recommended distances for
the various cable types are set by North American and international commercial
building wiring standards. These standards state that standards-compliant
horizontal copper cabling shall not exceed 90 m (295 ft) leaving 10 m (33 ft) total
for required patch cabling in both the office and telecommunications closet. It is
good practice to follow the cabling standards guidelines when installing building
cabling to help ensure a longer useful life for your cabling infrastructure, migration
to new technologies, and maximum flexibility for the network configuration.
•
If you are installing new cabling for data applications, it is recommended that
you For lobe cabling from the telecommunications closet to the wall outlet, it
is recommended that 150-ohm STP or four-pair Category 5 cable that meets
the international cable standard (ISO/IEC 11801) or North American cabling
standard (EIA/TIA 568A).
•
For backbone cabling, it is recommended that 62.5/125-micron multimode
optical fiber cable that meets the international cable standard (ISO/IEC 11801)
or the North American cabling standard (EIA/TIA 568A).
Number Of Attaching Devices
A Token Ring network supports up to 255 attaching devices or nodes on a single
network when using 150 Ohm shielded media (type 1, 1A, 2, or 2A). When cable
segments in the network are 100 or 120 Ohm, this number is decreased to 132 (72
Cable Type Impedance
Types 1 and 1A 150 Ohm
Types 2 and 2A 150 Ohm
Type 8 150 Ohm
Type 9 150 Ohm
Type 3 100 Ohm
Category 3 100 and 120 Ohm
Category 4 100 and 120 Ohm
Category 5 100 and 120 Ohm
Table 18. Copper Cable Types