61202.086L1-1 ISU 512 User Manual 57Chapter 6TestingTEST OPTIONSSelecting 2=TEST from the Main menu tree displays available local testing op-tions. Use the following menu path to select test options:2=Test1=Loopback DTE2=Loopback Proto3=2047 Checker4=NEBE/FEBE5=Software VerLoopback DTECauses both DTE ports to loopback toward user equipment. This allows per-formance of a bit error rate test (BERT) between the ISU 512 and end userequipment to verify proper cable connection, etc.Loopback ProtocolAllows data to be looped back toward the network after passing throughBONDING protocol. See Figure 6-1 for loopback points.Figure 6-1ISU 512 Loopback PointsRATEADAPTATIONNETIFCEDTEIFCENETWORK Network DTEProtocol DTE
