Cabletron Systems STHI Overview, Active Circuitry, Daughter Board Upgrade Kit, Tpim, Connector

STHI Overview

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.

1.2.3RI & 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

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