ANSI/TIA/EIA 568 Standards ANSI/TIA/EIA 569 Standards Structured Cabling Systems
ANSI/TIA/EIA 568
COMMERCIAL BUILDING TELECOMMUNICATIONS
CABLING STANDARD
I. PURPOSE
This standard outlines specifications for a generic telecommunications cabling system. The purpose is to enable the planning and installation of telecommunications cabling with limited knowledge of the products that will be installed.
This standard also establishes performance criteria for various system configurations and their elements.
II. CABLING STRUCTURE
The elements of a cabling system are listed below: A. Horizontal Cabling B. Backbone Cabling C. Work Area
D. Telecommunications Closet E. Equipment Room
F. Entrance Facilities III. SCOPE
This standard specifies cabling of commercial buildings which are office oriented. Typically, this includes sites of up to 3,000 to 1,000,000 M2with a population up to 50,000 users.
IV. HORIZONTAL CABLING
A. Horizontal cabling shall be of star topology, each work area connector shall be connected to a telecommunications closet. The maximum horizontal distance shall be 90 meters. An additional 10 meters is allowed for work area cables, patch cables, etc. B. Recognized Cables
1. 4-pair 100 ? UTP cable 2. 2-pair 150 ? STP cable
3. 2-fiber, 62.5/125 um optical fiber cable
C. Outlet/Connector A minimum of two telecommunications outlets shall be provided to each work area. The two outlets shall be configured as follows:
1. One connector shall be supported by a 4-pair 100 ? UTP cable, Category 3 or higher 2. The other shall be supported by a minimum of one of the following:
a. 4-pair 100 ? UTP cable (Category 5 recommended)
b. 2-pair 150 ? STP cable
c. 2-fiber, 62.5/125 um optical fiber cable
D. The amount of untwisting of individual pairs to terminate shall be less than or equal to .5 in. for Category 5 and less than or equal to 1.0 in. for Category 4. E. Cable bend radius shall not be less than 4 times the cable diameter. V. BACKBONE CABLING
The purpose of backbone cabling is to provide interconnections between
telecommunications entrance facilities, equipment rooms and closets. The backbone cabling includes transmission media, intermediate and main cross-connects, and mechanical terminations.
A. Backbone cabling shall use the conventional hierarchical star topology B. Recognized Cables
1. 100 ? UTP multipair backbone cable 2. 150 ? STP cable
3. 62.5/125 um optical fiber cable 4. Single Mode Optical Fiber
C. Maximum Distance
1. 100 ?UTP cable - 800 meters 2. 150 ? STP cable - 700 meters
3. 62.5/125 um optical fiber - 2000 meters 4. Single mode optical fiber - 3000 meters VI. WORK AREA
Some networks require application specific electrical components on the
telecommunications outlet of the horizontal cabling. These application specific
components shall not be installed as part of the horizontal cabling. When needed they shall be placed external to the outlet. A. TELECOMMUNICATION CLOSETS
1. Shall be designed per ANSI/EIA/TIA 569
B. Function is for the termination of horizontal cable VIII. EQUIPMENT ROOMS
A. Shall be designed per ANSI/EIA/TIA 569 IX. ENTRANCE FACILITIES
A. Requirements are specified in ANSI/EIA/TIA 569 X. UTP CABLING SYSTEMS
A. Categories of UTP Cabling are as follows:
1. Category 1 & 2: These cables and connecting hardware are not covered or recognized as a part of the standard.
2. Category 3: This designation applies to UTP cable and hardware whose transmission characteristics are specified up to 16 MHz.
3. Category 4: This designation applies to UTP cables and associated connecting hardware whose characteristics are specified up to 20 MHz.
4. Category 5: This designation applies to UTP cable and hardware whose transmission characteristics are specified up to 100 MHz. B. Attenuation
Horizontal UTP Cable Attenuation [per 1 00m (328 ft.) @ 20'C]
Frequency---Category 3---Category 4---Category 5 --(MHz)----------(dB)----------(dB)-----------(dB) --0.064----------0.9-----------0.8------------0.8 --0.256----------1.3-----------1.1------------1.1 --0.512----------1.8-----------1.5------------1.5 --0.772----------2.2-----------1.9------------1.8 --1.0------------2.6-----------2.2------------2.0 --4.0------------5.6-----------4.3------------4.1 --8.0------------8.5-----------6.2------------5.8 -10.0------------9.7-----------6.9------------6.5 -16.0-----------13.1-----------8.9------------8.2 -20.0-------------------------10.0------------9.3 -25.0----------------------------------------10.4 -31.25---------------------------------------11.7 -62.5----------------------------------------17.0 100.0----------------------------------------22.0 C. Near End Crosstalk
Horizontal UTP Cable NEXT Loss (Worst Pair) [@ > 1 00m (328 ft.)]
Frequency---Category 3---Category 4---Category 5 --(MHz)----------(dB)----------(dB)--------(dB) ---1.5------------53------------68----------74 ---0.772----------43------------58----------64 ---1.0------------41------------56----------62 ---4.0------------32------------47----------53 ---8.0------------27------------42----------48 --10.0------------26------------41----------47 --16.0------------23------------38----------44 --20.0--------------------------36----------42 --25.0--------------------------------------41 --31.25-------------------------------------39 --62.5--------------------------------------35 -100----------------------------------------32 XI. UTP CONNECTING HARDWARE
It is desirable that hardware used to terminate UTP cables be of the IDC (Insulation Displacement Contact) Type. A. Attenuation
UTP Connecting Hardware Attenuation
Frequency---Category 3---Category 4---Category 5 --(MHz)----------(dB)----------(dB)----------(dB) ----1.0------------0.4------------0.1------------0.1 ----4.0------------0.4------------0.1------------0.1 ----8.0------------0.4------------0.1------------0.1 ---10.0------------0.4------------0.1------------0.1 ---16.0------------0.4------------0.2------------0.2 ---20.0----------------------------0.2------------0.2 ---25.0-------------------------------------------0.2 ---31.25------------------------------------------0.2 ---62.5-------------------------------------------0.3 --100.0-------------------------------------------0.4 B. Near End Crosstalk
UTP Connecting Hardware NEXT Loss
Frequency---Category 3---Category 4---Category 5 --(MHz)----------(dB)----------(dB)----------(dB) ----1.0--------------58----------->65----------->65 ----4.0--------------46------------58------------>65 ----8.0--------------40------------52-------------62 ---10.0-------------38------------50-------------60 ---16.0-------------34------------46-------------56 ---20.0---------------------------------------------54 ---25.0---------------------------------------------52 ---31.25--------------------------------------------50 ---62.5---------------------------------------------44 --100.0---------------------------------------------40
C. Each 4-pair UTP Cable shall be terminated in an 8 position modular jack at the work area.
XII. UTP PATCH CABLE AND JUMPERS
A. Length
1. In main cross-connect and intermediate cross-connect, patch cord lengths should not exceed 20 meters.
2. In the telecommunications closet, jumpers that bridge horizontal wiring should not exceed 6 meters. Lengths in excess of these shall be deducted for maximum cable length. B. To assure adequate flex-life, UTP patch cords shall have stranded conductors.
TIA/EIA 568 EIGHT-POSITION JACK PIN/PAIR ASSIGNMENTS
TIA/EIA T568A
TIA/EIA T568B
ANSI/TIA/EIA 569
COMMERCIAL BUILDING STANDARD FOR TELECOMMUNICATIONS PATHWAYS & SPACES
I. PURPOSE
The purpose is to standardize design and construction practices within and between buildings which are in support of telecommunications equipment and media. Standards are outlined for rooms or areas and pathways into and through which telecommunications media and equipment are installed. II. SCOPE
The scope of the standard is limited to the telecommunications aspect of commercial building construction and design. The standard does not cover safety aspects of building design.
商业建筑通信布线标准EIA568和EIA569（英文）
