Setting this object to a value as detailed furter on 
(except 0) will initiate a test on the specific port, 
if the operation is allowed (according to TestMask). 
If the operation is not allowed, the mux will ignore the 
operation.
The test/s requested will be set according to the respective
bit:
  TEST                  BIT
 -----------            ---
 localLoop               1
 remoteLoop              2
 bert                    3
 plb                     4
 inband                  5

 prbs                    8
 loop2-v54  (RLB)        9
 loop3-v54  (LLB)       10

 Tone injection         13
 Tx-plb                 14
 Tx-llb                 15
 DTE loop (HSSI)        16

 HDSL-Tx-Inband         20
 HDSL-Rx-Inband         21
         Monitor                22  (test port)
         User Line Loopback         23

 Rem-Loop-on-Rem-Unit   25
         LBBD                   26
         LB1                    27
         LB2                    28
 BERT-on-Rem-Unit       29
         TS Remote Loop         30
         LLB-on-Rem-Unit        31

 e.g : If the requested value is 3 -> 0000000000000011  ->
       Bits 1 & 2 are set -> the requested tests are :
                                    local-loop
                                    remote-loop  

Setting this object to stop (value=0 ; all bits are 0), 
will stop all the user requested tests running on the 
selected port; it will NOT stop the tests initiated by 
the system.