Digital Equipment DECconcentrator 500, Installation Manual, Page: 22 / 98

1–2 DECconcentrator 500 Installation
1.1.2 Optical Bypass
The multimode Network Management Card has an RJ12 connector to provide sig-
nals for an optical bypass switch. This switch maintains connectivity of the FDDI
dual ring in the absence of power or during fault conditions of a node. Refer to the
Fiber Distributed Data Interface Network Configuration Guidelines manual for a
complete description of the optical bypass switch.
1.2 Location
You can install the DECconcentrator in a standalone configuration or in an extended
local area network (LAN). You can place and use the DECconcentrator 500 in a main
distribution frame (MDF), intermediate distribution frame (IDF), horizontal distri-
bution frame (HDF), office distribution frame (ODF), satellite distribution frame
(SDF), open office environment, and a computer room. You can place a concentrator
enclosed in a plastic cover in an office environment. You can install a concentrator
without a plastic cover in a standard 48-centimeter (19-inch) rack.
1.3 Configurations
For configuration and cabling information refer to the following:
•
Configuration rules and information — refer to the Fiber Distributed Data
Interface Network Configuration Guidelines manual.
•
Cabling information — refer to the DECconnect System Fiber Optic Plan-
ning and Configuration and DECconnect System Fiber Optic Installation
manuals.
1.4 Physical Description
A fully configured DECconcentrator 500 unit consists of the cover, chassis, power
supply, controller/backplane, card cage, and option cards.