What are the roles of the Junior and Senior Deacon in a Lodge?

Deacons are two lodge officers attached to the Worshipful Master and Wardens, bearing the dove as their characteristic emblem 1. The charge of candidates during lodge proceedings rests in their hands 1.

In managing communications and entry, the Senior Deacon has charge of the inner door, while the Junior Deacon is placed in charge of the outer door 2. Legal communication between the interior and exterior of the lodge passes through these doors upon a regular alarm being reported and handled under the order of the Worshipful Master, with the Junior Deacon attending the outer door alongside the Tiler 2.