Browse Prior Art Database

Cable Bending Radius Guide

IP.com Disclosure Number: IPCOM000245877D
Original Publication Date: 2016-Apr-14
Included in the Prior Art Database: 2016-Apr-14
Document File: 3 page(s) / 165K

Publishing Venue

Motorola

Related People

Lee, Anita: INVENTOR [+3]

Abstract

In a rack setup, it is normal to wind or coil extra cable lengths. Depending on the cable management scheme, it may also require the cables to make a 90deg or even 180deg turn. There have been occurrences whereby these cables were wound or bend to a radius smaller than the recommended values. And inadvertently caused issues like; - Mechanical failure of conductor, fiber or jacket Signal lost in fiber optic cables (signal refracted) - Increased VSWR (due to increased loss, reflection quirks, impedance mismatch) in RF cable - Increased return loss in CAT6 cable. Affect also insertion loss, crosstalk, propagation delay and skew performance. - Increased impedance of cable. - Reduced cable shielding performance - Reduced ground performance of ground cables (due to increased inductance) - Affect inductance in power cables This invention may be used together with cable tie and standard tools (e.g. wire cutter) to dress the cables with a defined radius. It can support single cable or a bundle.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 53% of the total text.

Page 01 of 3

Cable Bending Radius Guide

By

Anita Lee CAL068, Benny Oh CBO115, Lee Meng Chung CML108,
Motorola Solutions

ABSTRACT

  In any typical wiring scheme or cable management, it is normal to wind or coil extra cable lengths. Depending on the system layout, space availability and length, it may be necessary to bend the cables over a 90deg or even 180deg turn. A multitude of less than desirable effects have been known to occur due to these cables being wound or bend to a radius smaller than the recommended values.

  This invention uniquely accommodates various bending angles and diameters. It also has the flexibility to hold more than one cable.

PROBLEM

  In general, cable minimum bending radius must not be smaller than 8 times of its diameter. There is a known array of issues that is consequential of minimum bending radius violation. Inadvertently, issues that may occur include;

- Mechanical failure of conductor, fiber or jacket Signal lost in fiber optic cables (signal refracted).

- Increased VSWR (due to increased loss, reflection quirks, impedance mismatch) in RF cable.

- Increased return loss in CAT6 cable. Affect also insertion loss, crosstalk, propagation delay and skew performance.

- Increased impedance of cable.

- Reduced cable shielding performance.

- Reduced ground performance of ground cables (due to increased inductance).

- Affect inductance in power cables.

  Most common practice in managing the cable bend radius is to have installers fix several points along the cable to form a bend or cable guides with a fixed radius. However, these solutions do not provide for adjustable radius and normally need to be attached or anchored to the rack/base.

  They also do not support 180 degree bend or even 360degree bundling. The typical cable bend angle is being limited to 90degree.

SOLUTION

  This invention can be used together with cable tie and standard hand tools (e.g. wire cutter). The

© 2015 Motorola Solutions, Inc.


Page 02 of 3

same invention could easily support different bundles of cable or single cable having varying bend radius.

  It can be adapted into multiple platforms, desktop, mobile or base station. It is not bulky, compact design. No...