DDF-120Ω plug-in wiring module

The exchange line (internal line, with receiving and transmitting distinctions) generally uses DDF data cables, which are typically twisted pairs, meaning one signal uses two pairs of twisted wires (one pair for receiving and one for transmitting, also referred to as incoming and outgoing). Note that the cables are generally shielded or grounded twisted pairs, with the ground wire connecting to the S-point contact spring on the module, and connecting and conducting with the backplane and rack. The 120Ω/120Ω balanced connection module has wiring holes on both sides. The exchange line should be sorted according to the designed cable color classification, then passed through the wiring hole at the back right of the module and into the right hole of the module body (generally), leading to the front of the module, and then connected using a connection knife at the front a.b of the 16 system's connection module (the upper side of a single module strip corresponds to the a, b points of label 0). At this point, one pair of exchange lines is completed, and the same method is used to connect another pair of wires in the same signal (corresponding to the a, b points of label 1). This method is repeated until all exchange line signal routes are completed. The exchange line is connected.

The transmission line (external line, with receiving and transmitting distinctions) generally uses DDF data cables, which are typically twisted pairs, meaning one signal uses two pairs of twisted wires (one pair for receiving and one for transmitting, also referred to as incoming and outgoing). Note that the cables are generally shielded or grounded twisted pairs, with the ground wire connecting to the S-point contact spring on the module, and connecting and conducting with the backplane and rack. The transmission line pairs should be sorted according to the designed cable color classification, then the cables should be passed through the wiring hole at the left side of the module's back panel, and then into the left hole of the module body leading to the front of the module (generally), and then connected using a connection knife at the lower spring of the 16 system module strip, corresponding to the a, b points of label 0. At this point, one pair of transmission line pairs is completed. The same method is used to connect another pair of wires in the same signal (corresponding to the a, b points of label 1). Other transmission signal routes are similarly connected until all transmission line pairs are completed.