TCU Ports
Page 1-3
•
support for Cabletron Systems’ Automatic Beacon Recovery
Process (ABRP),
•
automatic speed fault protection,
•
active filtering, re-timing, and repeating circuitry on all ports,
•
Multiple Ring Out connectivity for Passive MAU workgroups,
•
and LANVIEW LEDs for “at-a-glance” diagnostic monitoring.
Note:
The TRXMIM only
executes
port switching. Port-switching
assignments must be issued by a management module
with
port-assigning capability, such as TRMM-2 or TRMM-4.
1 . 2 . 1 T C U P o r t s
Each TRXMIM is equipped with 12 or 24 TCU (Trunk Connector
Unit) ports, depending on the TRXMIM model (see Table 1-1). Each
TCU port is fitted with a female RJ-45 modular connector jack to
support the attachment of either STP (shielded twisted pair) or UTP
(unshielded twisted pair) cabling with RJ-45 connector plugs.
Models that support STP cabling use RJ-45 connectors that provide
a grounded connection for the cabling shield.
L o b e P o r t a n d R i n g O u t P o r t C o n f i g u r a t i o n s
Each TCU port on the TRXMIM is internally defaulted to operate as
a lobe interface to support the insertion of a Token Ring station into
a ring. However, each TCU port may also be reconfigured, via the
Local Management (LM) application, to function as a Ring Out port
to support the connection of passive MAU (Multi-Station Access
Table 1-1 Port and Media List for TRXMIM Models
TRXMIM-22A
12 - Unshielded RJ-45 ports
TRXMIM-24A
24 - Unshielded RJ-45 ports
TRXMIM-42A
12 - Shielded RJ-45 ports
TRXMIM-44A
24 - Shielded RJ-45 ports
