Cabletron Systems STHI Manual De Usuario

Page B-1

Use of the STHI may involve a variety of cable types. The STHI hub’s 
network ports support either Shielded Twisted Pair (STP) or Unshielded 
Twisted Pair (UTP) cabling, depending on the STHI model, while Token 
Ring Port Interface Modules (TPIMs) allow for network expansions onto 
UTP, STP, Multimode Fiber Optic, and Single Mode Fiber Optic cabling. 

The HubSTACK Interconnect cable (Part Number 9380141) which is 
needed to interconnect an STH hub with an STHI is provided with each 
STH.

Take care in planning and preparing the cabling and connections for the 
network. The quality of the connections and the length of cables are critical 
factors in determining the reliability of the network. 

STHI models 22 and 24 and TPIM-T2 support D-inside wiring (DIW) voice 
grade Unshielded Twisted Pair (UTP) cable as described below and in 
EIA SP-1907B

. All category 5, all category 4, and some (see Section 2.3.2 on 

) category 3 UTP cables meet Token Ring network performance 

requirements. 

Both UTP modules (STHI-22 / 24) support UTP cables classified as 
category 3, 4, and 5. 

UTP cable is categorized according to the following specifications:

 consists of (usually) four Unshielded Twisted Pairs of 24 AWG 

solid wire for data or voice communication. (IBM Type 3 is coincidentally 
the same as UTP Category 3.) It is typically used to wire cable runs within 
the walls of buildings. In some installations, pre-existing UTP building 
wiring can be used for Token Ring cabling.