Cabletron Systems 24 Lanview LEDs, TCU Ports, Lobe Port and Multiple Ring Out Port Configurations

LANVIEW LEDs

1.2.1LANVIEW 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.

1.2.2TCU 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

STH-22	12	- Unshielded RJ45 ports
STH-24	24	- Unshielded RJ45 ports
STH-42	12	- Shielded RJ45 ports
STH-44	24	- Shielded RJ45 ports

Lobe Port and Multiple Ring Out Port Configurations

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 Workgroups.

Ring Speed Fault Protection

STH hubs also provide Ring Speed Fault Protection on each TCU port to protect against beaconing conditions caused by stations inserted at the

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