Filter
Top Products
INTRODUCTION
Page 1-3
You can upgrade the TRXI-22A and TRXI-42A to twenty-four ports
using a twelve port upgrade kit available from Cabletron Systems
(Cabletron Part Number TRXI-24A-UGKIT or TRXI-44A-UGKIT).
The TRXI provides two additional ports for Ring In and Ring Out
(RI/RO) connections. These ports support Cabletron’s Token Ring Port
Interface Modules (TPIMs). TPIMs provide full repeater functionality.
They are not included with the TRXI, but can be ordered separately
from Cabletron. Table 1-1 lists each TPIM.
1.4 TRXI FEATURES
Active TCU Ports
The active TCU ports regenerate, reshape and filter the incoming
signal permitting UTP lobe cable lengths of up to
100 meters
and STP
lobe cable lengths up to
150 meters
at 16 Mbps ring speed.
Cable Signal Polarity
Differential Manchester encoding is utilized for each of the
concentrator module TCU ports. This permits passing data regardless
of receive link polarity.
Note
: If a reversed polarity condition is discovered, the segment should
be removed from the network and wired correctly (according to the
connector wiring shown in Chapter 2, Requirements / Specifications).
This will avoid the potential for future compatibility problems.
Speed Fault Protection
If a station attempts to insert into the ring at a ring speed
(4 or 16 Mbps) different from what is set on the TRXI, that port is
automatically bypassed to prevent the ring from beaconing. The Lobe
Port Status LED blinks indicating the port with the speed fault is
bypassed.
Local Management
Local Management provides the tools to manage the TRXI and all of
its attached segments. You access Local Management by connecting a
Digital Equipment Corporation VT™ 320 series terminal or a PC
using VT320 emulation software to the TRXI’s COM 1 port.