This value reports the kind of loopback currently active on this facility, from the LpbkType enumeration covering terminal, facility, crs, ds1feac, ds3feac, fac2ni, and noloop. An administrator reads it to know whether a technician has looped traffic back at this point for testing, since an active loopback affects live traffic and must be cleared afterward. For example, a value of facility(2) shows a facility loopback is currently engaged, meaning traffic through it is being looped rather than passed end-to-end.