Definition of VSWR – Please refer some of your older books.(frankly i too dono.)
Coming to the practical point. I hope you are having a VSWR meter. First check whether the frequency band is in 1800 Mhz. Mostly the range may be in 900 band n u may get false reading. Next, for DTF (Distace to fault)first give the app. distance of your comlpet cable length. most meters will have D1 and D2 points where in u can give the distance; the meter has to measure.
Normal values has to be 1.4 for VSWR and 1.04 for DTF. If u get a value say 64.5 VSWR it means that the port is opened somewhere. u can also say that the signal which was sent by VSWR meter has not all returned back. Ultimately the job of a VSWR meter is to send a signal n check the value of signal returned and if not, the measure of signal loss, n also the distance where the signal is lost.
if u get a a very high level VSWR, then disconnect the cable from vswr meter, n connect an omni/bulb type of antenna(2dBi) antenna n check the value, this i to know whether the value that u get once u connect to the cable is right.
hope u r atleast a bit clear.