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FusionStorage 8.0.0 Block Storage Hardware Installation Guide 06

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Installation Specifications for Signal Cables

Installation Specifications for Signal Cables

  • In overhead cabling mode, cables in a cabinet are orderly routed from bottom to top. In underfloor cabling mode, cables are routed orderly from top to bottom.
  • Each signal cable must go through a continuity test before installation.
  • Signal cables to be installed are intact and have no joint.
  • Do not bind or cross cables of the same type on different devices or boards. Otherwise, device or board replacement is affected.
  • Ethernet signal cables are bound up with each bundle no more than 20 cables.
  • The bending radius (R) must meet the requirements listed in Table A-76.
Table A-76 Bending requirements for signal cables

Cable Type

Bending Radius (R)

  • Ethernet cables
  • Stacking cables

R ≥ 2d

Optical fibers

R ≥ 40 mm (1.57 in.), bending angle > 90°

Figure A-115 shows the bending radius (R).

Figure A-115 Bending radius (R)


Bending radius of signal cables


Cable diameter

  • Do not pull, press, or squeeze optical fibers forcibly.
  • Turn points of pigtails are not too tight or entangled with each other. Pigtail pairs are sorted in order and bound up.
  • When routed outside a cabinet, optical fibers are laid in corrugated pipes or troughs before being bound up by cable ties. Cables are bound with moderate force without leaving binding trace. Table A-77 describes protective tubes of different types. Choose proper tubes based on site requirements.
Table A-77 Protective tubes


Maximum Number of Optical Fibers

Open corrugated tube (recommended)


Closed corrugated tube


Winding pipe

  • 10: outer diameter 6 mm (0.24 in.)
  • 20: outer diameter 12 mm (0.47 in.)
  • When an optical fiber enters a cabinet, the length of the corrugated tube that houses the optical fiber is not greater than 100 mm (3.94 in.). The cut of the corrugated tube is wrapped by PVC insulation tapes, and the corrugated tube is fixed, as shown in Figure A-116.
Figure A-116 Fixing an optical fiber entering a cabinet
  • Each U-shaped slot of a cable trough outlets a maximum of four cables.
Updated: 2019-11-14

Document ID: EDOC1100081415

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