There are three sorts of communications technologies in the Radivan universe, distinguished by their range.
In urban areas on developed planets, aboard ships and stations, people are rarely more than a few meters from a communications relay. These relays are very low-powered very-wideband direct sequence spread-spectrum radios, with an effective range of only a few meters. They provide the user with very high-speed connections to the local (building or ship) network. The building network is usually connected to the planet-wide Internet, by a point-to-point laser link, optical fibre, or the like. This means that most people are never out of communications contact. In rural areas, under-developed planets, and the like, the distance between relays is greater, and the speeds available decreases. In very remote areas, the only communications may be satelite link.
Inter-planetary links are limited to the speed of light, of course. There are also limits on the speed of data transfers, and their are actual marginal costs in transfering data. People in remote areas of a system often tend towards insularity. Visitors from planets, used to being up-to-date on everything often find the experience maddening. Others seek the areas out as a place to have a relaxing vacation.
Interstellar communications is done by jumping the communication through a wormhole. Transmissions are beamed to relay station located nearby, and then jumped through. On well-travelled routes, there may be a dedicated jump-ship fleet, that makes regular scheduled jumps, forwarding the received messages on. On remote routes, the messages wait for the next ship to come along and jump them through. (It's very bad etiquette to not do this on jumps where it's expected.) Worlds tend to arrange themselves in informal sectors, where there is only a month or two lag from any world in the sector to any other world.
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