This month, we examine how that wiring functions as a circuit. The tip wire is the positive side and the ring wire is the negative side of a two-wire telephone circuit. Table 1 contains the standard color codes for the tip and ring of Pair 1 and Pair 2 of two-pair twisted telephone wire. It is imperative to comply with these color codes at the NIU and each telephone jack for proper telephone operation. See Figure 1 for their wiring diagram.
Topology refers to the physical way a network is wired.
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