A method of testing trunks grouped in tributaries to evaluate interoffice
transmission quality across a TDM network of all trunks in the office.
The method includes performing a testing cycle testing only one trunk in
each tributary in the central office to verify transmission quality.
Testing includes setting up an interoffice connection to the one trunk,
performing a transmission test on the one trunk. The method can also
include attempting a connection to every trunk in each tributary in the
testing cycle. The method can also include performing a plurality of
testing cycles until all trunks in the central office have been tested,
wherein each testing cycle includes testing one untested trunk in each
tributary.