Telecom Cables for Outdoor Plant
Trackside Telephone Cable
The trackside telephone cable, usually denoted by RT/ZHLS or A-2Y(L)2Y, are designed primarily for XDSL transmission in a LAN or access network. Trackside telephone cable are usually unit twin PE insulated jelly fi lled 0.63 or 0.9mm communication cables with either PE or LSZH sheath. The trackside telephone cables are installed in the cable troughs along the side of the track. The cables can be used to connect everything from stations and relay rooms to telephone points in location cases. The applicable standards are NR/PS/TEL/00015 (formerly RT/E/PS/00015 and GK/RT 0315) for UK NETWORK RAIL and TS0886/BS 1822 & BR892 for UK NETWORK RAIL, SNCF CT 2328 /SNCF CT 2329 for France RATP. For direct burial application, brass tape armouring or Zetabon type corrugated steel tape armouring can be offered against rodent attack.
Metro Communications Cables
Two metro communications cables are usually employed within railway equipment rooms located in either open locations or within the tunnels/stations. One is LUL specifi cation G7621 (type 1/non section 12) which is designed for installation in trackside bracket runs and for use within railway equipment rooms located in open locations. The other, the LUL specifi cation G7622 (type 2/section 12) metro communications cable is designed for trackside bracket runs, and railway equipment rooms within subsurface tunnels and stations.
Scada/Pilot Cables
The Scada/Pilot Cable are jelly fi lled 0.9mm multipair telephone cables complying with BS 3573. These telecom cables are suitable for modem based Supervisory Control and Data Acquisition systems (SCADA) operating in the VF range 300 to 3000Hz. The SCADA system is radio-based and includes an integrated hardware/software system that monitors and alarms on the power distribution, escalator status, elevator status, security intrusion, fare collection intrusion, fi re alarm etc.
The applicable standard is NR/PS/ELP/27220 (formerly RT/E/PS/0034) for UK NETWORK RAIL.
Trackside Fiber Cable
Trackside fi ber cables are fi bre communication cables designed to serve high traffi c and data rate requirements and FTN applications. To meet the security concerns of tunnels and urban metro system, both metal armoured and all dielectric optic fi ber cables with up to 144 fi ber counts can be supplied, offering electromagnetic immunity within the rail network for systems with high traffi c and data requirements. Trackside cables have a single mode fibre, single continuous non-metallic strength member, a water-blocking compound, fibre carrier, separator and a PE sheath. The armoured version usually has corrugated steel/polymer laminate tape for mechanical protection. Compact and cost-effi cient optical fi ber micro-cables are increasingly being installed in dense railway subway networks. The use of fi ber yarns guarantee for both longitudinal water tightness and vibration reducing characteristics. The use of premium single mode fibres guarantees highest data rates and best transmission reliability. Other than corrugated armouring, the metal free all dielectric fi ber optic cables can be glass armoured with rodent protection or reenforced with double sheath with buffer intermediate layer.
The applicable standards are NR/PS/TEL/00014 (formerly RT/E/PS/00014), BR 1837 and SCCF CT2242 (corrugated steel tape armoured) SNCF ST2513 (unarmoured).
Radiating Cables
The radiating cables are another form of coaxial cables to provide a tuned bi-directional desired leakage effect between transmitter and receiver. The cables are often used in underground, tunnels where an antenna is impossible. These fl exible perforated coaxial cables act like antenna in this confi ned environment. They are extremely important for ESTMS/ETCS radio based system.