outlet21Descrip is a read-write text field (up to 64 characters) that holds a free-form description an administrator attaches to outlet 21 on the Unity PDU, separate from the short label stored in outlet21Name. Because outlet21Name is typically kept short, this description field gives room for extra context an admin wants documented alongside the outlet, such as noting a maintenance restriction, such as being reserved for hot-swap testing. For example, an admin might set outlet21Descrip to a longer note noting a maintenance restriction, such as being reserved for hot-swap testing, so anyone reviewing outlet 21's configuration later understands why it's allocated the way it is.