Digital Equipment DECconcentrator 500, Руководство по установке, Страница: 32 / 98

Preparing for Installation 2–5
The DECconcentrator 500 is available as DEFCN-AC, DEFCN-AD, DEFCN-BC,
and DEFCN-BD. You may have option cards already installed in your concentrator.
Refer to the Option Card Installation manual shipped with the concentrator for op-
tion card information.
•
DEFCN-AC is for use in a rack and contains a U.S. power cord. It does not
have a plastic cover.
•
DEFCN-BC is for use on a tabletop and contains a U.S. power cord. It has a
plastic cover.
•
DEFCN-AD and DEFCN-BD are for applications outside the United States
and Canada and have no power cord. You must order the required power cord
separately.
2.2 Site Preparation
Verify that the installation site meets the physical, environmental, power, and cab-
ling requirements for the DECconcentrator 500.
Use the checklist in Section 2.3 to verify that the site is ready. Refer to the Fiber
Distributed Data Interface Network Configuration Guidelines manual or the Fiber
Distributed Data Interface System Level Description manual for configuration in-
formation. Refer to Appendix A for operating, environmental, and power require-
ments for the unit.
Note that each cable in a cable plant should have a unique identification number re-
corded on a tag attached to the cable. Testing and certification information about the
cable should have been recorded in the cable plant log book. Table 2–2 shows a sam-
ple of a fiber cable plant log-book entry.
Table 2–2: Sample Cable Plant Log-Book Entry
Fiber Label
Fiber Size
and Color Fiber
Length Loss
850/1300
Corrected
Loss
850/1300
Certifica-
tion Date
Operator
Test
Equip-
ment
B02H02/01 62.5/125 500 M 1.8/1.3 1.7/1.2 8/14/89 J.P.R Intelco