Adding small cells to mobile networks made up of full-sized base stations should help to fuel more voice and data calls, but outdoors, linking those dispersed cells to wired networks presents its own problems. Connecting a high-capacity data line to a cell mounted on a lamp post or a telephone pole isn't as easy as wiring up a cell tower. Power, security and wiring are all harder to arrange, vendors and analysts say. The problems are unique to outdoor small cells, versus indoor ones that tend to have easy access to wiring.