sally port

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sally port

[′sal·ē ‚pȯrt]
(ordnance)
Large gate or passage in a fortified place.

sally port

A gate, secret door, or underground passageway in a medieval castle provided for troops going forth on a sortie.
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Sally ports and revolving doors help maintain the envelope around the low dew point areas while allowing thousands of guests to enter each hour.
Sally port vestibules with special door controls were incorporated into the design to allow guests to easily and comfortably enter the exhibit while revolving doors at the exit protect the underwater viewing area.
The correctional medicine circulation is contained within the unit with sally ports at critical security locations to allow transitions to and from the adjacent D&T services with no exposure to the general public and patient population.
Tenders are invited for 16 port univiversal output system - includes touch panel for control of front and rear sally ports, jail cell intercomm, acknwledge and visitor visitation; 16 port intercomm sytem - includes all intercomm communication from and to jail cells; data rack 42u - ico relay controllers - 2 post open frame.
* Reduce staffing costs by providing alternative perimeter security allowing the deactivation of most guard towers (except at vehicle and pedestrian sally ports) and berm surveillance positions.