3Com 7000 manual ATM Cabling

110APPENDIX D: CABLING REQUIREMENTS

■make changes quickly

■isolate faults in the distribution system

Consult the cabling system plan to set up the cable labeling and record keeping system best suited to the environment. Also consider the following recommendations:

■ Identify cables by securely attaching a label to the ends of all cables.

■ Draw a floor location grid matrix using the building floor plans. For easy reference, use this grid when assigning location numbers to cables.

■ Assign a unique block of sequential numbers to the group of cables that run between each pair of wiring closets.

■ Assign a unique identification number to each distribution rack.

■ Make all work areas and wiring closets easy to identify by labeling the front panel of the CoreBuilder 7000 and other hardware and by displaying the floor location grid and cabling plan in each wiring closet.

■ Keep accurate and up-to-date cable identification records, such as

	IBM's Cable Identification Label Sheet or Cable Schedule. Post records
	near each distribution rack. On the appropriate cable schedule, record
	the following cable drop information: the cable source, destination,
	jumper location, and any additional information.
	■ Make sure that optical and coax cables are labeled Rx and Tx
	accordingly.
ATM Cabling	When planning the installation, thoroughly inspect the present cabling to
	determine if it meets the specifications in the cabling system or standards
	used at the site.
	In addition to adhering to the local standards, all cable must conform to
	the American National Standard ATM Physical Layer Medium Dependent
	(PMD) standard, ISO.166-1990, American National Standards Institute,
	which defines the Physical Medium Dependent (PMD) layer of the ATM
	network. Currently, there are two approved PMD standards: Multi-mode
	Fiber (MMF-PMD), which is defined in ANSI standard X.3-166-1992, and
	Single Mode Fiber (SMF-PMD), which is defined in ANSI standard
	x.3-184-198x.