A twisted pair data cable has an internal construction that introduces an additional lay length design variable and thus permits a greater range of lay scheme options. A four-pair data cable can comprise four twisted pairs and can be fabricated such that the twisted pairs are segregated into two groups that each comprise two twisted pairs. In addition to the individual conductor pair twists, each of the two groups of two twisted pairs can be twisted independently of one another, improving the cable's ability to reject both internal and alien crosstalk interference. The smaller circumferential distance of each group also allows each group to have a smaller minimum overall lay if desired, allowing for a greater range of design options when selecting a combination of individual pair and overall lay lengths that satisfy electrical specification requirements in terms of interference rejection, insertion loss, and propagation delay.

Provided herein is a multi-core cable through which positions of a plurality of insulated conductors and a plurality of non-insulated conductors in a cross section in a longitudinal direction are changed and a likelihood of transmission performance being reduced is low. A multi-core cable includes n conductor bundles.

In a method for forming a Category 6A communication cable suitable for Power over Ethernet applications, four pairs of individually insulated conductors may be provided, and each of the conductors may have a diameter of at least approximately 0.0240 inches. A respective twist lay for each of the pairs may be selected to result in the communications cable having a propagation delay skew of less than approximately 45 nanoseconds per one hundred meters and a direct current resistance unbalance between any two of the four pairs of less than approximately one hundred milliohms per one hundred meters. Each of the four pairs may be twisted based at least in part on the selected twist lays, and a jacket may be formed around the four twisted pairs.

A dual cable alignment apparatus aligns assembled cable ends provided with contact elements on two cables of a twisted cable strand in a predetermined correct rotational position. The alignment apparatus includes two cable rotating modules arranged on an apparatus frame and equipped with rotary cable grippers for rotating each assembled cable end about its longitudinal axis, and an optical detection apparatus for determining the corresponding rotational position of the assembled cable ends. To adjust the distance between the assembled cable ends, a cable rotating module is displaceable by a drive on the apparatus frame, whereby it is ensured that each assembled cable end can be brought into the desired rotational position precisely and reliably, and an optimal shadow image of the two contact elements can be detected for position detection.

A dual cable alignment apparatus aligns assembled cable ends provided with contact elements on two cables of a twisted cable strand in a predetermined correct rotational position. The alignment apparatus includes two cable rotating modules arranged on an apparatus frame and equipped with rotary cable grippers for rotating each assembled cable end about its longitudinal axis, and an optical detection apparatus for determining the corresponding rotational position of the assembled cable ends. To adjust the distance between the assembled cable ends, a cable rotating module is displaceable by a drive on the apparatus frame, whereby it is ensured that each assembled cable end can be brought into the desired rotational position precisely and reliably, and an optimal shadow image of the two contact elements can be detected for position detection.

Provided herein is a multi-core cable through which positions of a plurality of insulated conductors and a plurality of non-insulated conductors in a cross section in a longitudinal direction are changed and a likelihood of transmission performance being reduced is low. A multi-core cable includes n conductor bundles.

A multipair cable includes an inner layer part including two differential signal transmission cables for an inner layer that are twisted together, a press winding tape wound around a periphery of the inner layer part, and an outer layer part including a plurality of differential signal transmission cables for an outer layer that are wound around an outer periphery of the press winding tape. The inner layer part further includes a buffer tape disposed between the two differential signal transmission cables.