On the TV series Stargate SG-1, they envisioned using conventional EMR (like radio and TV signals) through wormhole connections.
Later plots faced invasion attempts through the stargates (permanent, direct-dial wormhole portals), so matter shielding was employed, and signals were used to authenticate who was on the other side of the connection before lowering the shield.
Later plots faced invasion attempts through the stargates (permanent, direct-dial wormhole portals), so matter shielding was employed, and signals were used to authenticate who was on the other side of the connection before lowering the shield.