Network System Technical Reference Guide

NT1R20 Off Premise Station (OPS) analog line card Page 433 of 544
Option 11C and 11C Mini Technical Reference Guide
Figure 56
Traditional OPS application configuration
Note: OPS service should not be confused with off-premise extension
(OPS) service. OPS service is the provision of an extension to a main
subscriber loop bridged onto the loop at the serving CO or PBX.
Additionally, OPS as used to denote off-premise extension service
should not be confused with the OPS class-of-service assigned in the
Single-line Telephone Administration program (LD10).