DEFCN-AC DECCONCENTRATOR 500

DEC Concentrator which is analogous to a hub/switch and is for fiber optic networking. The DECconcentrator 500 is an American National Standards Institute (ANSI) X3T9-compliant physical layer device for use in a Fiber Distributed Data Interface (FDDI) network. The concentrator provides flexible application of FDDI to accommodate the diverse building wiring schemes. The concentrator is the key component in the Digital dual ring of trees topology. It supports building and campus wiring topologies through the creation of hierarchical trees. The concentrator is an active device and, in its simplest form, is a multiport physical layer repeater. It decodes, retimes, and, if necessary, modifies the repeated data stream. The DECconcentrator 500 has a 25-pin D-subminiature connector on the input/output (I/O) panel. You can connect a terminal directly to the 25-pin D-subminiature connector. You can also connect to a terminal through a modem (or equivalent). Out-of-band management (OBM) allows you to manage the concentrator with or without a Network Management Card. OBM does not require any special management station or software other than a terminal The concentrator runs a self-test after power up or a software-initiated reset. The self-test includes software tests and initialization of the hardware. This test includes isolation of faulty hardware by reconfiguration. After successful initialization, the operational software controls the hardware to provide: � FDDI token ring function � Support for reception, processing, and transmission of remote management, maintenance operations protocol (MOP) packets, and station management (SMT) packets � Volatile and nonvolatile error and data logs � Ring management and ring fault handling (FDDI Station Management (SMT)) � Out-of-band management � Optical bypass The Unit consists of a Chassis and backplane and can control up to three modules. this unit has two modules. The bottom slot is unoccupied and just has a cover (which is cracked.) The modules are: DEFCN-MB 2-Port STA Management MOD W/OPTICAL-BYPASS-CNTL FOR FDDI DU_ DEFCN-NA FDDI 4 Port Module

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