Active circuitry, Daughter board upgrade kit, 3 ri & ro ports – Cabletron Systems STHI User Manual

Page 13: Ri & ro ports -4

STHI Overview

Page 1-4

Active Circuitry

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

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