.2.1 LANVIEW LEDs
Cabletron Systems’ LANVIEW Status Monitoring and Diagnostics
System is a troubleshooting tool. Conveniently located on the front panel,
LANVIEW LEDs help the user to quickly identify power failures,
beaconing conditions, cable faults, and link problems.
Refer to Section 4.1, LANVIEW LED Signals for more information on the
LANVIEW LED visual status monitoring system.
.2.2 TCU Ports
Each STH, depending on the STH model (see Table 1-1. ), is equipped
with 12 or 24 TCU ports, each ﬁtted with a female RJ45 modular
connector jack to support the attachment of either STP (shielded twisted
pair) or UTP (unshielded twisted pair) cabling with RJ45 connector plugs.
Models that support STP cabling use RJ45 connectors that provide a
grounded connection for the cabling shield.
Table 1-1. Port and Media List for STH Models
12 - Unshielded RJ45 ports
24 - Unshielded RJ45 ports
12 - Shielded RJ45 ports
24 - Shielded RJ45 ports
Lob e Port a nd Multip le Ring Out Port Config ura tions
Each TCU port on the STH 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 intelligent
hub’s Local Management (LM) application, to function as a Ring Out port
to support the connection of non-intelligent, passive MAU (Multi-Station
Access Unit) workgroups. See Section 1.2.4, Support for Passive MAU
Ring Sp e e d Fa ult Prote c tion
STH hubs also provide Ring Speed Fault Protection on each TCU port to
protect against beaconing conditions caused by stations inserted at the