Which class of the system was created to secure a single equipment room (ER)?

TIA-606-B Class 1 was created to address the simplest infrastructure scenario - a single equipment room or telecommunications room with no backbone connections to other rooms or buildings. It defines labeling, record-keeping, and documentation requirements proportional to a single-space installation, making it the correct class for securing and administering that one ER.

Class 2 was created for premises containing multiple telecommunications spaces within a single building, requiring backbone cross-connect administration.

Class 3 was created for campus environments where backbone cabling spans multiple buildings across a property.

Class 4 was created for multi-campus enterprises requiring coordinated administration across geographically distributed locations.