SYT 1 NUM telephone cable 1~112 pairs SYT NUM telephone cables are used for digital high bit rate network telephone links.Normative Construction:Conductor: Solid Bare copper AWG20Insulation: Polyethylene.Shielding: Aluminium/Polyester tape general shield.Drain wire: 0.45mm tinned copper under tape.Sheath: PVC grey or ivory, or grey LSZH Electrical Characteristics:Maximal working voltage: 300VMutual Capacitance: 80 nF/KmCapacity Unbalance: Pair/Pair:  300pF/500mAttenuation at 2 MHz: AWG20: 3.5 dB/100m Mechanical Characteristics:Working temperature: -10°C ~ 70°CFlame retardant: IEC 60332-1