Transmission system for pulse signals

Claim 1

A transmission system for pulse modulation signals such as pulse code modulation signals comprising a plurality of cables that are spliced together end to end and wherein each cable contains a plurality of group conductors and each group conductor contains a plurality of pairs of conductors and wherein different group conductors are utilized for forward and reverse transmission, wherein a plurality of inductances comprising ferrite tubes have openings through which individual ones of said pairs of conductors extend, each of said group conductors surrounded by a shielding cover, and each of said ferrite tubes spaced on said pair of conductors and having a length and cross section which depends on the properties of the ferrite material and have an inductance value L with respect to unsymmetrical conductor currents which approximately are defined by the following equuation: ##EQU11## where: Z = Wave resistance for the unsymmetric wave type m = Number of places of insertion of tubular bi-filar inductances in a continuous conductor path of length l 2 l 1 = Reference lengths f 1 = Reference frequency f 2 = Highest frequency to be transmitted, whereby the cross-talk demands must be considered N = Number of pairs of a group n = 10 lg [log] N a f .sbsb.1 = direct cross-talk at the frequency f 1 via the conductor length l 1 a 1 = Operational damping of the symmetrically operated pair at the frequency f 1 via the conductor length l 1 a s .sbsb.1 = Damping of the interference from the ground-symmetric into the ground unsymmetric wave type at the frequency f 1 of a pair via the conductor length l 1 a u .sbsb.1 Operative attenuation for ground-unsymmetric transmission through a pair over the section length l at the frequency f 1 a u .sbsb.2 = Operative attenuation for ground-unsymmetric transmission through a pair over the section length l 2 at the frequency f 2 a 2 = Operative attenuation through a pair over the section length l 2 at the frequency f 2 .