MD4 Medium Distance Trackside Telecom Cables

Application

The cables are designed for long distance of over 10km telecommunications alongside railway lines.

Standard

  • SNCF CT 2328 (Main cables) /SNCT CT 2329 (Branch cables)

Cable Construction

MD4

CT2328 Type (Main Cables)

  • Conductors: Solid copper, 0.8mm nominal diameter
  • Insulat ion: Coloured sol id polyethylene.
  • Cabling Element: Four conductors are twisted together to form a quad.
  • Possible Harness: Aluminium screen.
  • Filling: Petroleum jelly.
  • Screen: PE-copolymer coated aluminium tape.
  • Drain Wire: Tinned drain wire.
  • Inner Sheath: Low density polyethylene.
  • Screen: One corrugated copper tape.
  • Intermediate Sheath: Low density polyethylene.
  • Armour: Two helically applied steel tapes.
  • Outer Sheath: Low density polyethylene.

  • Optional

  • CT2329 Type (Branch Cables): For CT 2329 type, the cables have PE inner sheath, double corrugated steel tapes armour and PE outer sheath, without aluminium tape screen & copper tape.

Electrical Characteristics at 20℃

Nominal Conductor Diameter mm 0.8
Maximum Conductor Resistance (DC) Ω/km 73.4
Minimum Insulation Resistance @500 V DC (3mins) MΩ.km 15000
Mutual Capacitance @800Hz nF/km 51
Average Capacitance Unbalance
Main Cables
In quad pF/1450 m 50
Between quads pF/1450 m 30
Real-ground pF/1450 m 200
Branch Cables
In quad pF/1450 m 100
Between quads pF/1450 m 100
Real-ground pF/1450 m 700
Maximum Attenuation @1MHz dB/km 15.9
Maximum Reduction Factor for Main Cables @100V/km 50Hz
14 quads 0.3
21 quads 0.2
28 quads 0.18
Dielectric Strength (DC voltage 1min)
Conductor to Conductor V 1500
Conductor to Screen V 3000

Mechanical and Thermal Properties

  • Bending Radius: 10×OD
  • Temperature Range: -40℃ to +60℃ (during operation); -10℃ +60℃ (during installation)

Dimensions and Weight

CT2328 (Main cable)

Cable Code No. of Quads Nominal Sheath Thickness
mm		 Nominal Overall
Diameter
mm		 Nominal Weight
kg/km
Inner Interm. Outer
0.8mm Conductor, 1.27mm Insulated Wire
RS2328-2Y2Y(K)2YB2Y-14Q0.8 14 1.2 1.1 2.2 29.2 1332
RS2328-2Y2Y(K)2YB2Y-21Q0.8 21 1.3 1.3 2.5 31.3 1655
RS2328-2Y2Y(K)2YB2Y-28Q0.8 28 1.3 1.3 2.5 35.5 2013

CT2328 (Main cables with screened quads)

Cable Code No. of Quads Nominal Sheath Thickness
mm		 Nominal Overall
Diameter
mm		 Nominal Weight
kg/km
Inner Interm. Outer
0.8mm Conductor, 1.27mm Insulated Wire
RS2328-2Y(L)2Y(K)2YB2Y-(14+7)Q0.8 14+7screen Quads 1.3 1.3 2.5 32.7 1765
RS2328-2Y(L)2Y(K)2YB2Y-(18+3)Q0.8 18+3screen Quads 1.3 1.3 2.5 32.9 1783

CT2329 (Branch cable)

Cable Code No. of Quads Nominal Sheath Thickness
mm		 Nominal Overall
Diameter
mm		 Nominal Weight
kg/km
Inner Outer
0.8mm Conductor, 1.4mm Insulated Wire
RS2329-2Y2YB2Y-4Q0.8 4 1.0 1.7 16.4 339
RS2329-2Y2YB2Y-8Q0.8 8 1.2 1.8 18.8 477
RS2329-2Y2YB2Y-14Q0.8 14 1.2 2.2 22.3 686