barcode in vb.net 2008 PART FOUR in Software

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TABLE A2
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PART FOUR
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Appendixes
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Common Types of Coaxial Cable Typical NEC type CL2 CMP CL2 CMP CM Center cond AWG 8 sol 18 sol 11 str 10 str 14 sol 18 str CMP 14 sol CL2X 20 sol CMP 20 sol CL2 20 str CL2P 20 str CM 20 sol CMP 20 sol CM, CL2 22 sol CMP 22 sol CL2 CL2P 20 str 20 str Nom imped, ohms 75 75 50 50 75 75 75 50 535 50 50 75 75 93 93 50 50 50 50 Nom vel prop (c), % 82 82 78 83 78 66 83 66 695 66 80 78 82 84 85 80 80 78 78
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Coaxial cable type RG-6/U RG-8/U RG-11/U
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Rated use Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum Nonplenum Plenum
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FG-58/U RG-58A/U RG-59/U RG-62/U Ethernet 10Base2 Ethernet 10Base5
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Typical mm 686 594 1024 907 1029 1029 884 490 404 490 406 615 538 615 508 470 406 1029 953
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OD in 0270 0234 0403 0357 0405 0405 0348 0193 0159 0193 0160 0242 0212 0240 0200 0185 0160 0405 0375
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CM, CL2 12 sol CMP 12 sol
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NOTE: In general, a cable with a more strict usage code may be substituted in an application that allows a less strict usage code For example, a cable rated to the stricter Class 2, Plenum (CL2P) code may be substituted in a Class 2, Riser (CL2R) application Likewise, CMP, MPP, and FPLP, which may be substituted for CL3P, will substitute for any code that allows CL3P to be substituted The chart does not list all possible substitutions, only those to the next level
The shielding properties of the cable depend somewhat upon good ground connections (both signal and earth grounds) However, the interconnection of grounds from different parts of a building, or even between buildings, can cause problems Grounding requirements for thick Ethernet coax are fairly severe, to ensure proper operation Safety and signal integrity are also issues in grounding The NEC and EIA/TIA-607 detail grounding and bonding requirements for coax LAN cable Coax consists of a center conductor and a coaxially positioned outer shield conductor separated by an insulating material, called a dielectric Ethernet LAN wiring uses two types of coax cable, often referred to as thicknet and thinnet Thicknet is the original Ethernet coax trunk distribution cable, now
APPENDIX A
Legacy Wire and Cable
Center conductor
Outer jacket
Braided wire or foil shield
Dielectric insulation
FIGURE A1 Coax Cable Construction
called 10Base5 Its larger diameter gave rise to the nickname thicknet after much smaller coax began to be used Thicknet cables are run in the walls or above the ceiling tiles near locations where workstations are planned A transceiver mounts directly around the coax and makes connection to the center conductor through a hole drilled through the outer jacket, shield, and dielectric insulation This arrangement is sometimes referred to as a vampire tap Thinnet is a newer Ethernet coax cable standard, 10Base2, that allows connection to the back of the workstation adapter The adapter, in effect, contains a built-
FIGURE A2 The positioning of the center conductor, surrounded completely by the concentric shield conductor, keeps all electromagnetic fields between the two conductors
PART FOUR
Appendixes
in transceiver Thinnet uses BNC-type connectors and T-adapters The cable is about 1/4 inch (1 cm) in diameter and is much more flexible than thicknet cable It is also less expensive, giving rise to another nickname, cheapernet Distances for a thinnet Ethernet segment are limited, as compared to thicknet ARCnet is another LAN topology that originally used coax cable Several types of coax have been used with ARCnet, including RG-11/U, RG-59/U, and RG-62/U RG-11/U and RG-59/U are 75-ohm coax cables, while RG-62/U is a 93-ohm cable The workstations are connected directly to the coax in a star arrangement Each leg terminates in a passive or an active hub device that couples the LAN signal to all of the other connected workstations or servers Coax Wire Sizes Wire sizes for coax cable are usually specified by RG number or manufacturer s part number Thick Ethernet cable is a special case that is referred to by the names Ethernet trunk cable, backbone cable, or 10Base5 cable A list of coax types used in LAN wiring is shown in Table A3 The RG numbering system is a standard coax cable rating system that identifies physical size, characteristic impedance, power handling, and other characteristics Common LAN coax cables are Ethernet, RGTABLE A3 Types of Coax Used in LAN Wiring Coax type RG-6/U Impedance 75 ohms LAN use ARCnet Special considerations Smaller and cheaper alternative to RG-11/U Lower loss but more rigid than RG-59/U Must use RG-6/U connectors May substitute for 8023 cable in an emergency or special circumstances Heavy cable is difficult to work with See RG-59/U Stranded center conductor required Original cheapernet cable Smaller and cheaper than RG-11/U, this cable is easier to install and readily available, as it is also used for CATV The famous IBM Terminal cable can be adapted to ARCnet Cable is marked for 8023 Double-shielded cable similar to RG-8/U Cable is marked for 8023 Similar to RG-58A/U with stranded center conductor
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