In telecommunications lexicon, a binder is a grouping of wires inside a common sheath. The common two-pair telephone cable you can buy at hardware stores for household wiring jobs (black, yellow, green, and red wires) is a two-pair binder. Binders can hold almost any number of wires. Thick telephone company trunk binders may hold 250 pairs. Neighborhood streets generally have 20, 50 or even 100 pair telephone binders supplying â€œdialtoneâ€ to the neighborhood. Within a house, two-pair binders are very common. Modern office building often fun 4, 6, or 8 pair cables to each desktop to provide telephone and computer network connections.