Remote Access

Access to an organizational information system by a user (or an information system) communicating through an external, non-organization-controlled network (e.g., the Internet). 

See the following for more information: 

NIST SP 800-171 Rev. 2.
NIST SP 800-128 NIST SP 800-53.
NIST SP 800-53 Rev. 4 under Remote Access.
NIST SP 800-128 under Remote Access NIST SP 800-53.

Access by users (or information systems) communicating external to an information system security perimeter. 

See the following under Remote Access for more information: 
NIST SP 800-18 Rev. 1. 
NIST SP 800-82 Rev. 2  NIST SP 800-53. 

Access by users (or information systems) communicating external to an information system security perimeter. Network access is any access across a network connection in lieu of local access (i.e., user being physically present at the device). 

See the following under Remote Access for more information: 

NISTIR 8183 NIST SP 800-53.
NISTIR 8183A Vol. 1 NIST SP 800-53.
NISTIR 8183A Vol. 2 NIST SP 800-53.
NISTIR 8183A Vol. 3 NIST SP 800-53.