Setting this object to a value as detailed further on (except 0) will initiate a test on the specific port. The test/s requested will be set according to the respective bit. The value of this object will be a sum of (2**n), where n is the Bit: TEST BIT VALUE reserved 0 1 PayloadLoop=RLB 1 (=Remote Loopback) 2 LineLoop=DIG 2 (=Digital) 4 OtherLoop 3 8 InwardLoop=LLB 4 (=Local Loopback) 16 BERT 5 32 LC 6 64 ToneInjection 7 128 Inband 8 256 e.g : If the requested value is 20 -> 010100 -> Bits 2 & 4 are set -> the requested tests are : LineLoopback=DIG InwardLoopback=LLB Not all tests combinations are valid. For valid test combination, see each product's specification. For LRS52, only single test is allowed simultaneously The terminology and order of the first tests (except BERT) is according to the one used for Test Status of DS1 and DS3 standards. The notations : RLB, LLB, DIG are the most used in RAD's products, but they can be different. For exact definition see product's spec. Setting this object to stop (value=0 ; all bits are 0), will stop all the user requested tests running on the selected port. When no test is running on the port, the Get value (test status) will be 0. PayloadLoop=RLB The received signal at this interface is looped through the device. Typically the received signal is looped back for retransmission after it has passed through the device's framing function. LineLoop=DIG The received signal at this interface does not go through the device (minimum penetration) but is looped back out. OtherLoop Loopbacks that are not defined here. InwardLoop=LLB The sent signal at this interface is looped back through the device. LC This loop is applicable only for HSSI interface, towards the router . ToneInjection This loop is applicable for analog voice (like FXS).