Transmission system for pulse signals
AssigneeSiemens Aktiengesellschaft
InventorsReginhard Pospischil, Josef Domer
Life of this patent
Estimating the term…
Abstract
This invention relates to a transmission system for transmitting electrical signals whereby the conductor path consists of several sections of a cable which contain a number of twin conductors and wherein inductances are inserted at fairly great distances in the form of bi-filar chokes at least for the double conductors so as to cause unbalanced to ground currents to be essentially damped.
Claims7
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.sub.2
- l.sub.1 = Reference lengths
- f.sub.1 = Reference frequency
- f.sub.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.sub.f.sbsb.1 = direct cross-talk at the frequency f.sub.1 via the conductor length l.sub.1
- a.sub.1 = Operational damping of the symmetrically operated pair at the frequency f.sub.1 via the conductor length l.sub.1
- a.sub.s.sbsb.1 = Damping of the interference from the ground-symmetric into the ground unsymmetric wave type at the frequency f.sub.1 of a pair via the conductor length l.sub.1
- a.sub.u.sbsb.1 Operative attenuation for ground-unsymmetric transmission through a pair over the section length l at the frequency f.sub.1
- a.sub.u.sbsb.2 = Operative attenuation for ground-unsymmetric transmission through a pair over the section length l.sub.2 at the frequency f.sub.2
- a.sub.2 = Operative attenuation through a pair over the section length l.sub.2 at the frequency f.sub.2.
Dependencies are inferred from the claim text.