Communication Cables

Underground Telephone Cable

APPLICATION

For connecting subscribers’ equipment within a building.

CONSTRUCTION

Solid annealed telecom copper wires / cablesuniformly coated with tin, fully color-coded F/S PE insulation. All interstices of the cable core are completely filled with jelly compound.

The cable core is wrapped with plastic coated aluminium tape shield as well as an overall black polyethylene sheath on which sequential length marking is printed.

Detailed Specification

10P unit, The color of open lapping tape (10P ~ 200P)
Unit Number	1	2	3	4	5	6	7	8	9	10
Lapping Tape Colour	B	Y	G	R	V	B	Y	G	R	V
	B	Y	G	R	V	W	W	W	W	W
	11	12	13	14	15	16	17	18	19	20
	B	Y	G	R	V	B	Y	G	R	V
	BR	BR	BR	BR	BR	BK	BK	BK	BK	BK

* Where B is Blue, Y is Yellow, G is Green, R is Red, V is Violet, W is White, BR is Brown, and BK is Black

50P unit, The color of open lapping tape (300P~600P)
Unit Number	1	2	3	4	5	6
Lapping Tape Colour	B	Y	G	R	V	B
	B	Y	G	R	V	W
	7	8	9	10	11	12
	Y	G	R	V	B	Y
	W	W	W	W	BR	BK

Electric characteristic : (at 20°C)
Item	Dia. (mm)	0.4	0.5	0.65
Max. conductor resistance, Ω/km		147.5	93.5	56.5
Insulation dielectric strength V/1min.	Conductor --ground	D.C. 500V or A.C. 350v (R.M.S.)
Min. Insulation resistance, MΩ-km		Over 5000
Mutual Capacitance, nF/km (1kHz)	Over 50P (Included)	Average : under 55
	Under 30P (Included)	Average : under 60

Cable Size
Diameter (mm)	0.4	0.5	0.65
Pair (P)	10, 20, 30, 50, 100, 200, 300, 400, 600

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Underground Telephone Cable