InArmor CST DJ Corrugated Steel Tape (CST) Double Jacket (DJ)

Direct buried cable deployed when rodent protection is a serious concern or when additional crush resistance is needed due to rocky soil.


Central strength member: FRP


Optical fiber


Dry loose tube


Water-swellable yarns


Inner jacket


Corrugated steel tape armor


Polymer jacket







Excellent rodent resistance

Proven reliable design

Improved reliability due to inner jacketing

Cost-effective design

InArmor CST DJ is a cost-effective and proven reliable design. It is a multi-tube cable with corrugated steel tape as an anti-rodent armoring and double jacket. Inner jacketing improves reliability. Apart from an excellent rodent resistance, this cable is also UV-resistant, so it features multi-purpose outdoor installation: from direct buried to duct and aerial lashed.

Typically, this cable consists of a stranded core with a central strength member (FRP) and dry loose tubes with optical fibers. The stranded core is fixed by water-swellable yarns. A water-swellable tape is laid over loose tubes. An armor of corrugated steel tape is laid over an inner jacket.

InArmor CST DJ’s maximum rated design tension can reach up to 607 lb but it may be produced with even higher MRDT up to 1.124 lb. It has a wide range of operating temperatures from -40°F to +158°F and installation temperatures from -22°F to +158°F (operating temperature range can be increased on request).

Check how this direct buried fiber optic cable can be deployed in FTTH system.

Maximum rated design tension (MRDT) 607 lb (2.7 kN)
Crush 126 lb/in (0.22 kN/cm)
Fiber count, up to 72 (6х12) 96 (8х12) 144 (12х12)
Cable diameter, in 0.535 0.598 0.772
Cable weight, lb/ft 0.111 0.133 0.216
Minimum bending radius, in 8 9 11.6
Operating temperature -40°F ... +158°F
Installation temperature -22°F ... +158°F
Transportation and storage temperature -58°F ... +158°F
Minimum bending radius 15 x cable diameter
Design life 25 years

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