1) According to EIA SP-2840A (a draft version of EIA-568-x) the minimum
bend radius for UTP is 4 x cable outside diameter, about one inch.
For multipair cables the minimum bending radius is 10 x outside
diameter.

SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair
(100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable, 15 cm (6-in)
for the stiffer plenum-rated kind.

For fiber optic cables not in tension, the minimum bend radius is 10 x
diameter; cables loaded in tension may not be bent at less than 20 x
diameter. SP-2840A states that no f/o cable will be bent on a radius
less than 3.0 cm (1.18-in).

2) The ISO DIS 11801 standard, Section 7.1 General specs for 100 ohm
and 120 ohm balanced cable lists three different minimum bend radii.
Minimum for pulling during installation is 8x cable diameter, min
installed radius is 6x for riser cable, 4x for horizontal.

For fiber optic cables not in tension, the minimum bend radius is
10 x diameter; cables loaded in tension may not be bent at less
than 20 x diameter. SP-2840A states that no f/o cable will be
bent on a radius less than 3.0 cm (1.18-in).
Some manufacturers recommendations differ from the above, so it is
worth checking the spec sheet for the cable you plan to use.

Answered by Raksha , an ibibo Master, at 9:29 AM on June 18, 2008

1) According to EIA SP-2840A (a draft version of EIA-568-x) the minimum
bend radius for UTP is 4 x cable outside diameter, about one inch.
For multipair cables the minimum bending radius is 10 x outside
diameter.

SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair
(100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable, 15 cm (6-in)
for the stiffer plenum-rated kind.

For fiber optic cables not in tension, the minimum bend radius is 10 x
diameter; cables loaded in tension may not be bent at less than 20 x
diameter. SP-2840A states that no f/o cable will be bent on a radius
less than 3.0 cm (1.18-in).

2) The ISO DIS 11801 standard, Section 7.1 General specs for 100 ohm
and 120 ohm balanced cable lists three different minimum bend radii.
Minimum for pulling during installation is 8x cable diameter, min
installed radius is 6x for riser cable, 4x for horizontal.

For fiber optic cables not in tension, the minimum bend radius is
10 x diameter; cables loaded in tension may not be bent at less
than 20 x diameter. SP-2840A states that no f/o cable will be
bent on a radius less than 3.0 cm (1.18-in).
Some manufacturers recommendations differ from the above, so it is
worth checking the spec sheet for the cable you plan to use.

Answered by Arti singh , an ibibo Specialist, at 2:25 PM on June 17, 2008

The minimum bend radius is the radius below which an object such as a cable should not be bent.

The minimum bend radius is of particular importance in the handling of fiber-optic cables, which are often used in telecommunications. The minimum bending radius will vary with different cable designs.

The manufacturer should specify the minimum radius to which the cable may safely be bent during installation, and for the long term. The former is somewhat shorter than the latter.

The minimum bend radius is in general also a function of tensile stresses, e.g., during installation, while being bent around a sheave while the fiber or cable is under tension. If no minimum bend radius is specified, one is usually safe in assuming a minimum long-term low-stress radius not less than 15 times the cable diameter.


Beside mechanical destruction, other reason why one should avoid excessive bending is to minimize microbending macrobending losses. Microbending losses are light attenuation that are induced by deformity (clinks) on the fibre while macrobending are the leakage of light through the fibre cranding and this is more likely to happen where the fibre is excessively bent.
Sources:http://en.wikip edi a.org/wiki/Minimum_bend_radius

Answered by Sharad Singh , an ibibo Master, at 3:41 PM on May 27, 2008

Well,

1) According to EIA SP-2840A (a draft version of EIA-568-x) the minimum
bend radius for UTP is 4 x cable outside diameter, about one inch.
For multipair cables the minimum bending radius is 10 x outside
diameter.

SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair
(100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable, 15 cm (6-in)
for the stiffer plenum-rated kind.

For fiber optic cables not in tension, the minimum bend radius is 10 x
diameter; cables loaded in tension may not be bent at less than 20 x
diameter. SP-2840A states that no f/o cable will be bent on a radius
less than 3.0 cm (1.18-in).

2) The ISO DIS 11801 standard, Section 7.1 General specs for 100 ohm
and 120 ohm balanced cable lists three different minimum bend radii.
Minimum for pulling during installation is 8x cable diameter, min
installed radius is 6x for riser cable, 4x for horizontal.

For fiber optic cables not in tension, the minimum bend radius is
10 x diameter; cables loaded in tension may not be bent at less
than 20 x diameter. SP-2840A states that no f/o cable will be
bent on a radius less than 3.0 cm (1.18-in).
Some manufacturers recommendations differ from the above, so it is
worth checking the spec sheet for the cable you plan to use.

Answered by Ajay Pal , an ibibo Master, at 8:14 AM on May 24, 2008

1) According to EIA SP-2840A (a draft version of EIA-568-x) the minimum
bend radius for UTP is 4 x cable outside diameter, about one inch.
For multipair cables the minimum bending radius is 10 x outside
diameter.

SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair
(100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable, 15 cm (6-in)
for the stiffer plenum-rated kind.

For fiber optic cables not in tension, the minimum bend radius is 10 x
diameter; cables loaded in tension may not be bent at less than 20 x
diameter. SP-2840A states that no f/o cable will be bent on a radius
less than 3.0 cm (1.18-in).

2) The ISO DIS 11801 standard, Section 7.1 General specs for 100 ohm
and 120 ohm balanced cable lists three different minimum bend radii.
Minimum for pulling during installation is 8x cable diameter, min
installed radius is 6x for riser cable, 4x for horizontal.

For fiber optic cables not in tension, the minimum bend radius is
10 x diameter; cables loaded in tension may not be bent at less
than 20 x diameter. SP-2840A states that no f/o cable will be
bent on a radius less than 3.0 cm (1.18-in).
Some manufacturers recommendations differ from the above, so it is
worth checking the spec sheet for the cable you plan to use.

Answered by Shobhit , an ibibo Master, at 7:10 PM on May 23, 2008

The minimum bend radius is the radius below which an object such as a cable should not be bent. The minimum bend radius is of particular importance in the handling of fiber-optic cables, which are often used in telecommunications. The minimum bending radius will vary with different cable designs. The manufacturer should specify the minimum radius to which the cable may safely be bent during installation, and for the long term. The former is somewhat shorter than the latter. The minimum bend radius is in general also a function of tensile stresses, e.g., during installation, while being bent around a sheave while the fiber or cable is under tension. If no minimum bend radius is specified, one is usually safe in assuming a minimum long-term low-stress radius not less than 15 times the cable diameter.
Beside mechanical destruction, other reason why one should avoid excessive bending is to minimize microbending macrobending losses. Microbending losses are light attenuation that are induced by deformity (clinks) on the fibre while macrobending are the leakage of light through the fibre cranding and this is more likely to happen where the fibre is excessively bent.
Sources:
http://en.wikipedi a.org/wiki/Minimum_bend_radius

Answered by ayisha , an ibibo Master, at 5:30 PM on May 23, 2008

hi rocky According to EIA SP-2840A (a draft version of EIA-568-x) the minimum
bend radius for UTP is 4 x cable outside diameter, about one inch.
For multipair cables the minimum bending radius is 10 x outside
diameter.

SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair
(100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable, 15 cm (6-in)
for the stiffer plenum-rated kind.

For fiber optic cables not in tension, the minimum bend radius is 10 x
diameter; cables loaded in tension may not be bent at less than 20 x
diameter. SP-2840A states that no f/o cable will be bent on a radius
less than 3.0 cm (1.18-in).

The ISO DIS 11801 standard, Section 7.1 General specs for 100 ohm
and 120 ohm balanced cable lists three different minimum bend radii.
Minimum for pulling during installation is 8x cable diameter, min
installed radius is 6x for riser cable, 4x for horizontal.

For fiber optic cables not in tension, the minimum bend radius is
10 x diameter; cables loaded in tension may not be bent at less
than 20 x diameter. SP-2840A states that no f/o cable will be
bent on a radius less than 3.0 cm (1.18-in).
this is taken from source http://stason.org/TULARC/networking /lans-cabling/19-0-What-is-the-Mini mum-Bending-Radius-for-a-Cable-Data -C.html

Answered by laks , an ibibo Master, at 3:23 PM on May 23, 2008

1) According to EIA SP-2840A (a draft version of EIA-568-x) the minimum
bend radius for UTP is 4 x cable outside diameter, about one inch.
For multipair cables the minimum bending radius is 10 x outside
diameter.

SP-2840A gives minimum bend radii for Type 1A Shielded Twisted Pair
(100 Mb/s STP) of 7.5 cm (3-in) for non-plenum cable, 15 cm (6-in)
for the stiffer plenum-rated kind.

For fiber optic cables not in tension, the minimum bend radius is 10 x
diameter; cables loaded in tension may not be bent at less than 20 x
diameter. SP-2840A states that no f/o cable will be bent on a radius
less than 3.0 cm (1.18-in).

2) The ISO DIS 11801 standard, Section 7.1 General specs for 100 ohm
and 120 ohm balanced cable lists three different minimum bend radii.
Minimum for pulling during installation is 8x cable diameter, min
installed radius is 6x for riser cable, 4x for horizontal.

For fiber optic cables not in tension, the minimum bend radius is
10 x diameter; cables loaded in tension may not be bent at less
than 20 x diameter. SP-2840A states that no f/o cable will be
bent on a radius less than 3.0 cm (1.18-in).
Some manufacturers recommendations differ from the above, so it is
worth checking the spec sheet for the cable you plan to use.

Answered by Ashish Yadav , an ibibo Wizard, at 2:52 PM on May 23, 2008

hello rocky The minimum bend radius is the radius below which an object such as a cable should not be bent. The minimum bend radius is of particular importance in the handling of fiber-optic cables, which are often used in telecommunications. The minimum bending radius will vary with different cable designs. The manufacturer should specify the minimum radius to which the cable may safely be bent during installation, and for the long term. The former is somewhat shorter than the latter. The minimum bend radius is in general also a function of tensile stresses, e.g., during installation, while being bent around a sheave while the fiber or cable is under tension. If no minimum bend radius is specified, one is usually safe in assuming a minimum long-term low-stress radius not less than 15 times the cable diameter.

Beside mechanical destruction, other reason why one should avoid excessive bending is to minimize microbending macrobending losses. Microbending losses are light attenuation that are induced by deformity (clinks) on the fibre while macrobending are the leakage of light through the fibre cranding and this is more likely to happen where the fibre is excessively bent.

Besides for cables, strain gauges also have a minimum bending radius. This radius is the radius below the strain gauge which will cause the malfunction of the gauge.
The minimum bend radius is the radius below which an object such as a cable should not be bent. The minimum bend radius is of particular importance in the handling of fiber-optic cables, which are often used in telecommunications. The minimum bending radius will vary with different cable designs. The manufacturer should specify the minimum radius to which the cable may safely be bent during installation, and for the long term. The former is somewhat shorter than the latter. The minimum bend radius is in general also a function of tensile stresses, e.g., during installation, while being bent around a sheave while the fiber or cable is under tension. If no minimum bend radius is specified, one is usually safe in assuming a minimum long-term low-stress radius not less than 15 times the cable diameter.

Beside mechanical destruction, other reason why one should avoid excessive bending is to minimize microbending macrobending losses. Microbending losses are light attenuation that are induced by deformity (clinks) on the fibre while macrobending are the leakage of light through the fibre cranding and this is more likely to happen where the fibre is excessively bent.

Besides for cables, strain gauges also have a minimum bending radius. This radius is the radius below the strain gauge which will cause the malfunction of the gauge
for more inf check source http://en.wikipedia.org/wiki/Minimu m_bend_radius

Answered by raj u , an ibibo Master, at 12:38 PM on May 23, 2008

Hi there ,

The minimum bend radius is the radius below which an object such as a cable should not be bent. The minimum bend radius is of particular importance in the handling of fiber-optic cables, which are often used in telecommunications. The minimum bending radius will vary with different cable designs. The manufacturer should specify the minimum radius to which the cable may safely be bent during installation, and for the long term. The former is somewhat shorter than the latter. The minimum bend radius is in general also a function of tensile stresses, e.g., during installation, while being bent around a sheave while the fiber or cable is under tension. If no minimum bend radius is specified, one is usually safe in assuming a minimum long-term low-stress radius not less than 15 times the cable diameter.

Beside mechanical destruction, other reason why one should avoid excessive bending is to minimize microbending macrobending losses. Microbending losses are light attenuation that are induced by deformity (clinks) on the fibre while macrobending are the leakage of light through the fibre cranding and this is more likely to happen where the fibre is excessively bent.

Besides for cables, strain gauges also have a minimum bending radius. This radius is the radius below the strain gauge which will cause the malfunction of the gauge.

Sources:

http://en.wikipedia.org/wiki/M inimum_bend_radius
http://www .okonite.com/engineering/bendi ng-ratios.html

Answered by Reeta K , an ibibo Master, at 11:23 AM on May 23, 2008