Telcordia GR-1275：中央办公室环境安装/移除通用要求

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"Telcordia GR-1275-CORE，中央办公室/网络环境设备安装/移除通用要求，由Telcordia Technologies发布，第三版，2001年12月" 《Telcordia GR-1275》是通信行业中一个重要的技术标准文档，全称为“Central Office/Network Environment Equipment Installation/Removal Generic Requirements”，它由美国的电信服务提供商和技术供应商Telcordia Technologies编制。该文档的主要目标是规定和指导中央办公室（Central Office）环境中的通信设备安装和移除的一般性要求。 GR-1275标准主要关注的是网络部署的质量与可靠性，旨在确保在中央办公室环境下安装和移除的设备能够满足严格的性能、安全和互操作性标准。这一标准适用于设备安装供应商，他们需要遵循这些规范来确保其产品和服务符合行业的最佳实践。文档的第三版（Issue 3）发布于2001年12月，替代了之前的第二版。在新版中，如果有新增、修改或删除的内容，会在页面外侧的垂直条形标记（|）旁进行标注，以便读者快速识别改动。技术联系人是Larry Puccio，他负责解答与文档相关的技术问题。为了获取此文档的副本，用户可以通过联系公司的文档协调员、Telcordia的客户经理，或者直接拨打Telcordia提供的电话号码（美国和加拿大：1.800.521.2673，全球其他地区：+1.732.699.5800），也可以访问官方网站www.telcordia.com下载。对于Telcordia的员工，可以直接拨打+1.732.699.5802。这个文档的版权由Telcordia Technologies所有，未经许可，不得复制。这表明文档的使用和分发受到严格的版权保护，以维护其技术内容的完整性和权威性。《Telcordia GR-1275》是一个对于电信行业内设备安装和移除工作具有重要指导意义的标准，它确保了中央办公室环境中网络设备的稳定、高效和安全运行，对于保持通信网络的可靠性至关重要。

Central Office Environment Installation/Removal Generic Requirements Issue 3, December 2001

List of Figures

xvi

GR-1275-CORE

Figure 10-11. Splicing of Auxiliary Framing Channels 1-1/2 Inches Difference

in Framing Levels . . . . . . . . . . . . . . . . . . . . . . . . . 10–28

Figure 10-12. Splicing of Auxiliary Framing Channels 2 Inches Difference in

Framing Levels . . . . . . . . . . . . . . . . . . . . . . . . . . 10–29

Figure 10-13. Auxiliary Framing Junction - Single Level . . . . . . . . . . . 10–30

Figure 10-14. Auxiliary Framing Intersection - Single Level . . . . . . . . . 10–31

Figure 10-15. Auxiliary Framing Intersection - Double Level . . . . . . . . . 10–32

Figure 10-16. Auxiliary Framing Finishing Caps . . . . . . . . . . . . . . . . 10–32

Figure 10-17. Auxiliary Framing Stiffening Clips and Through Bolts . . . . 10–33

Figure 10-18. Auxiliary Framing Brace Assembly - Low Ceiling Area . . . . 10–34

Figure 10-19. Auxiliary Framing Brace Assembly - High Ceiling Area . . . . 10–34

Figure 10-20. Typical Auxiliary Framing Brace Arrangement . . . . . . . . 10–35

Figure 10-21. Arrangement of Auxiliary Framing Braces . . . . . . . . . . . 10–36

Figure 10-22. Temporary Bracing at Unequipped Rows of Frames . . . . . 10–37

Figure 10-23. Auxiliary Framing Brace to 3 Inches 5 Pound Channel at

Support Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–37

Figure 10-24. Auxiliary Framing Brace at Building Column . . . . . . . . . 10–38

Figure 10-25. Auxiliary Framing Brace at Building Wall . . . . . . . . . . . 10–38

Figure 10-26. Typical Warren Truss Type Brace Arrangement for Floor

Supported Equipment Environments . . . . . . . . . . . . . . 10–39

Figure 10-27. Method of Installing Framing Braces at Same Location . . . . 10–40

Figure 10-28. Method of Installing New Brace to Existing Hanger Rod . . . 10–41

Figure 10-29. Method of Installing Braces at Right Angles to Existing

Support Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–42

Figure 10-30. Double Line Illustration of Cable Rack on Office Records . . 10–43

Figure 10-31. Single Line Illustration of Cable Rack on Office Records . . . 10–44

Figure 10-32. Typical Cable Rack . . . . . . . . . . . . . . . . . . . . . . . . 10–45

Figure 10-33. Corner Clamps: Stringers with Same Width; Stringers with

Different Width . . . . . . . . . . . . . . . . . . . . . . . . . . 10–46

Figure 10-34. Corner Clamps: Stringers with Same Width; Stringers with

Different Width . . . . . . . . . . . . . . . . . . . . . . . . . . 10–46

Figure 10-35. 45 Degree Outside Turn . . . . . . . . . . . . . . . . . . . . . . 10–47

Figure 10-36. 45 Degree Inside Turn . . . . . . . . . . . . . . . . . . . . . . 10–48

Figure 10-37. 45 Degree Right Angle Junction . . . . . . . . . . . . . . . . . 10–49

Figure 10-38. 45 or 90 Degree Intermediate Junction (45 Degree Shown) . . 10–49

Figure 10-39. 90 Degree Inside Turn . . . . . . . . . . . . . . . . . . . . . . 10–50

Figure 10-40. 90 Degree Inside Turn . . . . . . . . . . . . . . . . . . . . . . 10–50

Figure 10-41. In-Line Junction - Cable Rack Stringers . . . . . . . . . . . . . 10–51

Figure 10-42. In-Line Junction - Racks of Different Width . . . . . . . . . . 10–52

Figure 10-43. In-Line Junction - Small Offset Less Than the Width of Cable

Rack, Racks in Same Plane . . . . . . . . . . . . . . . . . . . . 10–52

Figure 10-44. In-Line Junction - Racks of Different Width, Smaller Rack

Approximately in Center . . . . . . . . . . . . . . . . . . . . . 10–53

Figure 10-45. In-Line Junction - Large Offset, Less Than the Width of Rack 10–54

Figure 10-46. In-Line Junction - Adjacent Racks in Same Plane . . . . . . . 10–54

Figure 10-47. In-Line Junction - Small Horizontal Offset Less Than Width of

Rack with 2 Inches Vertical Offset . . . . . . . . . . . . . . . . 10–55

Issue 3, December 2001 Central Office Environment Installation/Removal Generic Requirements

List of Figures

xvii

GR-1275-CORE

Figure 10-48. Right Angle Junction - Cable Racks in Same Plane . . . . . . 10–55

Figure 10-49. Right Angle Junction - Line-Up and Cross-Aisle Cable Rack,

Cross Aisle Rack Raised 2 Inches to Clear Apparatus . . . . . 10–56

Figure 10-50. Right Angle Junction - Additional Cable Support, Cable Racks

in Same Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–57

Figure 10-51. Right Angle Junction - Additional Cable Support, 2 Inches

Difference in Level of Racks . . . . . . . . . . . . . . . . . . . 10–58

Figure 10-52. Additional Cable Support - Cable Sag Prevention . . . . . . . 10–59

Figure 10-53. Right Angle Junction - 90 Degree Turn Same Plane . . . . . . 10–60

Figure 10-54. Right Angle Junction - Three Racks of Different Widths . . . 10–60

Figure 10-55. Right Angle Junction - Small Vertical Offset . . . . . . . . . . 10–61

Figure 10-56. Right Angle Junction - Large Vertical Offset End to End

Junction of Connecting Racks . . . . . . . . . . . . . . . . . . 10–61

Figure 10-57. Right Angle Junction - Large Vertical Offset Intermediate

Junction of Connecting Rods . . . . . . . . . . . . . . . . . . 10–62

Figure 10-58. Right Angle Junction - Vertical to Horizontal Rack - Large

Cable Radius (Bottom); Right Angle Junction - Abrupt Cable

Radius (Top) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–63

Figure 10-59. Right Angle Junction - Vertical to Horizontal Rack - Small

Cable Radius (Left); Right Angle Junction Between Horizontal

Racks (Right) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–64

Figure 10-60. 90 Degree Outside Turn Radius More Than 6 Inches . . . . . 10–65

Figure 10-61. 90 Degree Inside Turn Radius More Than 6 Inches . . . . . . 10–65

Figure 10-62. 90 Degree Outside Turn - Power Cable Racks . . . . . . . . . 10–66

Figure 10-63. Small Vertical Offset in Horizontal Racks . . . . . . . . . . . . 10–67

Figure 10-64. Large Vertical Offset in Horizontal Racks - Greater Than

9 Inches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–67

Figure 10-65. Terminating Exposed Ends of Cable Rack . . . . . . . . . . . 10–68

Figure 10-66. Terminating End of Cable Rack Where Cabling Continues . . 10–68

Figure 10-67. Terminating End of Cable Rack at Building Surfaces . . . . . 10–69

Figure 10-68. Terminating Vertical Cable Rack at Cable Hole . . . . . . . . 10–70

Figure 10-69. Terminating Vertical Cable Rack at Auxiliary Framing . . . . 10–71

Figure 10-70. Cable Rack Support - Directly to Auxiliary Framing . . . . . . 10–72

Figure 10-71. Cable Rack Support - Cable Rack Located 1/2 Inches from

Duct Type Frame Upright . . . . . . . . . . . . . . . . . . . . 10–72

Figure 10-72. Cable Rack Support - Cable Rack 2 Inches Above Auxiliary

Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–73

Figure 10-73. Cable Rack Support - Vertical Rack to Wall or Column . . . . 10–73

Figure 10-74. Cable Rack Support - Horizontal 5 Inches Rack to Wall . . . . 10–74

Figure 10-75. Cable Rack Support - Horizontal Racks to Floor . . . . . . . . 10–75

Figure 10-76. Cable Rack Support and Bracing - Cable Rack Not Attached

Directly to Auxiliary Framing (Brace Threaded Rod) . . . . . 10–76

Figure 10-77. Cable Rack Support and Bracing - Cable Rack Not Directly

Attached to Auxiliary Framing (Bar Brace) . . . . . . . . . . 10–77

Figure 10-78. Cable Rack Support and Bracing - Cable Racks Not Attached

Directly to Auxiliary Framing (Angle Bracket) . . . . . . . . . 10–78

Central Office Environment Installation/Removal Generic Requirements Issue 3, December 2001

List of Figures

xviii

GR-1275-CORE

Figure 10-79. Cable Rack End Brace - Cable Rack Not Attached Directly to

Auxiliary Framing (Threaded Rod Brace) Used in Seismic

Zones 0, 1, & 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–79

Figure 10-80. Cable Rack End Brace - Cable Rack Not Attached Directly to

Auxiliary Framing (Flat Bar Brace) Used in Seismic

Zones 3 & 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–80

Figure 10-81. Cable Rack End Brace - Cable Rack Not Attached Directly to

Auxiliary Framing (with Angle Bracket) Used in Seismic

Zones 3 & 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–81

Figure 10-82. Equipment Bracing in CDO Type Offices - Bracing Equipment

to Walls and Between Cable Racks . . . . . . . . . . . . . . . 10–82

Figure 10-83. Equipment Bracing in CDO Type Offices - Bracing Distributing

Frame to Wall and Between Equipment Line-Up . . . . . . . . 10–82

Figure 11-1. Frames Rigidly Bolted . . . . . . . . . . . . . . . . . . . . . . 11–16

Figure 11-2. Typical Anchor Pattern . . . . . . . . . . . . . . . . . . . . . . 11–17

Figure 11-3. Fastening Frame Junction Pipe to Duct Type Frame . . . . . 11–18

Figure 11-4. Pipe Support to Auxiliary Framing - Auxiliary Framing at

Same Height as Frame . . . . . . . . . . . . . . . . . . . . . . 11–18

Figure 11-5. Pipe Support to Auxiliary Framing - Auxiliary Framing

Raised 2 Inches or 3-1/2 Inches Above Frame Height . . . . . 11–19

Figure 11-6. Floor Fastening at Cable Hole for Frame with Floor Angle . . 11–20

Figure 11-7. Floor Fastening at Cable Hole for Frame with Sheet Metal

Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–21

Figure 11-8. Splicing Sleeve for Ladder Track . . . . . . . . . . . . . . . . 11–22

Figure 11-9. Creeper Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–23

Figure 11-10. Location of End Support and Ladder Stops in Track . . . . . 11–24

Figure 12-1. Firestopping Cable Holes in Floor with Mineral Wool-Ceramic

Products and Isolation of Cable Holes in Cable Slots . . . . . 12–13

Figure 12-2. Firestopping Cable Holes or Slots with Lightweight Concrete

(Cable Opening or Penetration Arrangement not Suitable for

Floor and/or Ceiling Cover Plates) . . . . . . . . . . . . . . . 12–14

Figure 12-3. Firestopping Cable Sleeves and Small Rectangular Openings

with Mineral Wool/Concrete Products . . . . . . . . . . . . . 12–15

Figure 12-4. Intumescent Drop-In Cover Support . . . . . . . . . . . . . . 12–16

Figure 12-5. Intumescent Firestopping - Floor Penetrations . . . . . . . . 12–17

Figure 12-6. Intumescent Firestopping - Through Wall Penetrations . . . . 12–18

Figure 12-7. Intumescent Firestopping - Circular Opening with More than

One Penetrating Item . . . . . . . . . . . . . . . . . . . . . . . 12–19

Figure 12-8. Intumescent Firestopping - Circular Opening with a Single

Penetrating Item . . . . . . . . . . . . . . . . . . . . . . . . . . 12–20

Figure 12-9. Intumescent Firestopping - Plastic or PVC in a Close Fitting

Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–21

Figure 12-10. Intumescent Firestopping - Plastic or PVC in Large Area

Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12–22

Figure 12-11. Firestopping Certification Label . . . . . . . . . . . . . . . . . 12–23

Figure 12-12. Cable Hole Opened Label . . . . . . . . . . . . . . . . . . . . . 12–23

Figure 12-13. Application of Intumescence Material . . . . . . . . . . . . . 12–24

Issue 3, December 2001 Central Office Environment Installation/Removal Generic Requirements

List of Figures

xix

GR-1275-CORE

Figure 12-14. Application of Intumescent Material . . . . . . . . . . . . . . 12–25

Figure 13-1. Stitching Requirements . . . . . . . . . . . . . . . . . . . . . . 13–28

Figure 13-2. Cross-Aisle Cable Rack Run Non-Continuously Over Aisles

of Higher Level than Cable Rack Over the Frame . . . . . . . 13–29

Figure 13-3. Typical Application of Fiber Insulation . . . . . . . . . . . . . 13–30

Figure 13-4. Protection of Cross Straps at Turns . . . . . . . . . . . . . . . 13–31

Figure 13-5. Protection on Cross Straps of Inverted Sections . . . . . . . . 13–31

Figure 13-6. Starting Stitch . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–32

Figure 13-7. Kansas City Stitch . . . . . . . . . . . . . . . . . . . . . . . . . 13–32

Figure 13-8. First Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–33

Figure 13-9. Second Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–34

Figure 13-10. Method of Ending Stitches . . . . . . . . . . . . . . . . . . . . 13–35

Figure 13-11. Splicing Double Strands of Twine . . . . . . . . . . . . . . . . 13–36

Figure 13-12. Sewing Cable to Supports at Turns . . . . . . . . . . . . . . . 13–37

Figure 13-13. Cables from Miscellaneous Run Secured Together Between

Rack and First Support with a Modified Chicago Stitch . . . . 13–38

Figure 13-14. Sewing Cables to Cable Brackets and Distributing Frame

Transverse Arms . . . . . . . . . . . . . . . . . . . . . . . . . 13–39

Figure 13-15. Securing Cable to Brackets at Single Sided LDF and TIDF by

Sewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–40

Figure 13-16. Chicago Stitch Used to Sew Cables Together . . . . . . . . . 13–41

Figure 13-17. Securing Cable to L-Type Bracket . . . . . . . . . . . . . . . . 13–42

Figure 13-18. Securing Cable to the Inside of U-Type Brackets . . . . . . . 13–43

Figure 13-19. Securing Horizontal Cable to Transverse Arms of Distributing

Frames Using Nylon Cable Ties . . . . . . . . . . . . . . . . . 13–44

Figure 13-20. Securing First Layer or Cable on Vertical Side of Distributing

Frame Using Nylon Cable Ties . . . . . . . . . . . . . . . . . . 13–45

Figure 13-21. Securing Second and Subsequent Layers of Cable on Vertical

Side of Distributing Frame Using Nylon Cable Ties . . . . . . 13–46

Figure 13-22. Additional Cable Support to Prevent Cable Sag . . . . . . . . 13–47

Figure 13-23. Auxiliary Cable Supports from Cable Rack or Auxiliary

Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–48

Figure 13-24. Auxiliary Support for Horizontal Inverted Cable Runs . . . . 13–49

Figure 13-25. Vertical Cable Runs in Exposed Locations . . . . . . . . . . . 13–50

Figure 13-26. Vertical Cable Runs in Cable Shafts or Enclosures . . . . . . 13–51

Figure 13-27. Vertical Cable Clamp - 1’3” and 1’8” Switchboard Cable Runs 13–52

Figure 13-28. Vertical Cable Clamp - 1’3” Power Cable Run (Otherwise the

Same as Figure 13-27) . . . . . . . . . . . . . . . . . . . . . . . 13–53

Figure 13-29. Vertical Cable Clamp - 1’8” Power Cable Run and 2’1”

Switchboard Cable Run (Power Run Shown) . . . . . . . . . 13–54

Figure 13-30. Ground Cable Support from Cable Rack . . . . . . . . . . . . 13–55

Figure 13-31. Ground Cable Support from Auxiliary Framing . . . . . . . . 13–56

Figure 13-32. Clamping Spiral Cable Runs . . . . . . . . . . . . . . . . . . . 13–57

Figure 13-33. Cable Dress at Duct Type Bays . . . . . . . . . . . . . . . . . 13–58

Figure 13-34. Minimum Cable Bending Radii . . . . . . . . . . . . . . . . . . 13–59

Figure 13-35. Sewing Vertical or Inverted Horizontal Runs . . . . . . . . . . 13–60

Figure 13-36. Sewing Horizontal Runs . . . . . . . . . . . . . . . . . . . . . 13–61

Central Office Environment Installation/Removal Generic Requirements Issue 3, December 2001

List of Figures

GR-1275-CORE

Figure 13-37. Starting Stitches for Cable Forms Sewed in One Direction

Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–62

Figure 13-38. Starting Stitches for Cable Forms Sewed in Both Directions . 13–62

Figure 13-39. Several Cables in Rectangular Formation Formed Out as a

Single Round Cable Arm . . . . . . . . . . . . . . . . . . . . . 13–63

Figure 13-40. Single Leg Cable Form at Right Angles to Butt Sewed with

Lock and Wiring Stitches . . . . . . . . . . . . . . . . . . . . . 13–64

Figure 13-41. Sewing Requirements for Sewed Forms and Superimposed

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–65

Figure 15-1. A Scaled Sketch Depicting Typical Solderless Wrapped

Connection Defects . . . . . . . . . . . . . . . . . . . . . . . . 15–8

Figure 15-2. Cross Section of a Typical Properly Soldered Connection . . 15–9

Figure 15-3. Connecting Ground Leads to No. 6 Ground Lead . . . . . . . 15–9

Figure 15-4. Solderless Connections at Screw Type Terminals . . . . . . . 15–10

Figure 16-1. Typical Sizes of Characters for Common Applications on

Frame and Rack-Mounted Equipment . . . . . . . . . . . . . . 16–9

Figure 18-1. Two Hole Compression Connector . . . . . . . . . . . . . . . 18–4

Figure 18-2. Grounding Conductor Bonded to Ferromagnetic Conduit . . 18–5

Figure 18-3. Typical Method of Grounding Toll Power Frames and Battery

Stands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18–6

Figure 18-4. Vertical Equalizer . . . . . . . . . . . . . . . . . . . . . . . . . 18–7

Figure 18-5. Central Office Ground . . . . . . . . . . . . . . . . . . . . . . 18–8

Figure 18-6. Typical Grounding and AC Power Feed in an Isolated Ground

Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18–9

Figure 18-7. Typical Equipment Connected to CO GRD System . . . . . . 18–10

Figure 18-8. Typical Conductor Marking Tags . . . . . . . . . . . . . . . . 18–11

Figure 18-9. Frame Line-up Grounding . . . . . . . . . . . . . . . . . . . . 18–12

Figure 19-1. Typical Grounding for Integrated and Isolated Ground Planes 19–5

Figure 19-2. Typical Overall Frame-Grounding Methods . . . . . . . . . . 19–6

Figure 19-3. Example of Connecting AC Circuit Equipment Grounding

Conductor and Conduit to Main Ground Bus in Ground

Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19–7

Figure 19-4. Example of Conduits Entering Isolated Ground Place

Through Ground Window from Fluorescent Lighting . . . . . 19–8

Figure 19-5. Typical Sequence of Connections to a Separate Ground

Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19–9

Figure 19-6. Tabulation of Typical Ground Window Connections . . . . . 19–10

Figure 20-1. Placement of Equipment Identification Tags and Arrangement

of Boxes on Pallets . . . . . . . . . . . . . . . . . . . . . . . . 20–32

Figure 20-2. Ringed Cable Cutters . . . . . . . . . . . . . . . . . . . . . . . 20–33

Figure 20-3. Equipment Identification Tags . . . . . . . . . . . . . . . . . . 20–34

Figure 24-1. Typical Stringer Type Raised Floor System . . . . . . . . . . 24–13

Figure 24-2. Typical Structural Platform . . . . . . . . . . . . . . . . . . . 24–14

Figure 24-3. Typical Cable Layout . . . . . . . . . . . . . . . . . . . . . . . 24–15

Figure 24-4. 90 Degree Inside Turn . . . . . . . . . . . . . . . . . . . . . . 24–16

Figure 24-5. Typical Seismic Zone 3 and 4 Fastening . . . . . . . . . . . . 24–17

Figure 24-6. Typical Seismic Zones 0,1 and 2 Fastenings . . . . . . . . . . 24–18

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