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STHI Overview
Page 1-4
Active Circuitry
3
On each TCU port, STHI hubs provide active circuitry which filters,
equalizes, and amplifies all received signals before transmitting them to
the next point on the ring. The result is enhanced signal integrity and
extended maximum station lobe cable distances.
Daughter Board Upgrade Kit
4
The following daughter board upgrade kits may be used to expand STHI
hubs from 12 to 24 TCU ports:
• TR-UTP-UGKT for STHI-22.
• TR-STP-UGKT for STHI-42.
1.2.3 RI & RO Ports
The STHI incorporates a pair of RI/RO port sockets for Token Ring Port
Interface Modules (TPIMs). This Ring In / Ring Out port pair allows for
the expansion of the main ring to other hubs. Refer to Section 5.6.3,
Port
Configuration Fields
, Subsection
RING OUT ENABLE Mode
, for the
procedure to enable RI/RO ports.
Essentially, TPIMs are media adapters which enable their host modules to
expand their network connections to other media types. The TPIM models
listed in Table 1-2 are produced by Cabletron Systems and may be
installed in the RI/RO port sockets on the STHI. Refer to Section 3.1,
Installing the STHI
, for installation instructions.
Table 1-2. TPIMs, Supported Media, and Connectors
TPIM Media Type Connector
TPIM-T1 Shielded Twisted Pair DB9
TPIM-T2 Unshielded Twisted Pair RJ45
TPIM-T4 Shielded Twisted Pair RJ45
TPIM-F2 Multimode Fiber ST
TPIM-F3 Single Mode Fiber ST