Alshaya was a security protocol that was used by the Vulcan race in the Alliance.
In an alternate reality, Supreme Arbiter of the Alliance Sarek envoked this security protocol after encountering a time displaced James T. Kirk and believed that he was a Borg assimilated Terran.
Unless it was removed by Sarek or altered, the protocol meant that only connections to the outside world were hard wired incoming links from the bridge which allowed the commander to signal him in an emergency. Furthermore, a hard wired two way link allowed Sarek to access the Wisdoms records. (TOS novel: Engines of Destiny)