From the game codex (aka Mass Effect wiki because I'm at work).
ME1-ME2
Spoiler
Mass relays are feats of Prothean engineering advanced far beyond the technology of any living species. They are enormous structures scattered throughout the stars, and can create corridors of virtually mass-free space allowing instantaneous transit between locations separated by years or even centuries of travel using conventional FTL drives.
Primary mass relays can propel ships thousands of light years, often from one spiral arm of the galaxy to another. However, they have fixed one-to-one connections: a primary relay connects to one other primary relay, and nowhere else. Secondary relays can only propel ships a few hundred light years, however they are omnidirectional: a secondary relay can send a ship to any other relay within its limited range.
There are many dormant primary relays whose corresponding twins have not yet been located. These are left inactive until their partner is charted, as established civilizations are unwilling to blindly open a passage that might connect them to a hostile species.
ME3
Spoiler
Once believed to be of Prothean origin, mass relays were in fact created by the Reapers using technology far beyond that of other living species. The enormous structures, scattered throughout the stars, create corridors of virtually mass-free space. This allows instantaneous transit between locations normally separated by years or even centuries using conventional FTL drives.
Primary mass relays can propel ships thousands of light-years. The flight path, however, is fixed to a single relay elsewhere in the galaxy. By contrast, secondary relays, while only capable of propelling ships a few hundred light-years, can reach any other relay within their limited range.
Many primary relays lie dormant, their destinations not yet known. These relays are often left inactive on purpose, as established civilizations are unwilling to blindly open a passage that might connect them to a new, hostile species. The Reapers do not share the same concern, and freely use the dormant relays.
Communications
Spoiler
Real-time communication is possible thanks to networks of expensive mass relay comm buoys that can daisy-chain a transmission via lasers.
Comm buoys are maintained in patterns built outward from each mass relay. The buoys are little more than a cluster of primitive, miniature mass relays. Each individual buoy is connected to a partner on another buoy in the network, forming a corridor of low-mass space. Tightbeam communications lasers are piped through these "tubes" of FTL space, allowing virtually instantaneous communication to anywhere on the network. The networks connect across regions by communications lasers through the mass relays.
With this system, the only delay is the light lag between the source or destination and the closest buoy. So long as all parties remain within half a light-second (150,000 km) of buoys, seamless real time communications are possible. Since buoys are maintained in all traveled areas, most enjoy unlimited instant communications. Ships only suffer communications lag when operating off established deep space routes, around uninhabited outer system gas giants, and other unsettled areas.
During wartime, comm buoy networks are the first target of an attack. Once the network is severed, it can take anywhere from weeks to years to get a message out of a contested system. In systems where a buoy network has not yet been built or has been destroyed, rapid communication means ferrying information through high-speed courier ships and unmanned data drones.
Can you link the source for 5x15 sizes?





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