Chapter 3. Terminal Menu Operation and Structure61200176L1-1 Express 6100/6120 User Manual 3-11IDSL/Channel RateWrite security: 2; Read security: 5Determines the rate at which data is transferred over the IDSL link.Possible rates are 64K, 128K, and 144K.IDSL/NEBEsRead security: 5This contains the number of Near-End-Block-Errors (NEBEs) thathave been detected by the Express 6100/6120’s IDSL circuitry. Con-tinuous errors can indicate a line problem, but a burst at one time isnormal.IDSL/FEBEsRead security: 5This contains the number of Far-End-Block-Errors (FEBEs) that havebeen detected by the IDSL circuitry on the other end of the link. Con-tinuous errors can indicate a line problem, but a burst at one time isnormal.»» WAN/L2 ProtocolWrite security: 3, Read security: 5This parameter specifies the layer 2 data link layer transport used.When selected as PPP, the Express 6100/6120 will negotiate PPP overthe IDSL interface. This is used mainly for campus wiring applica-tions. Parameters for controlling the PPP negotiation are in the Con-figuration/PPP Profile menu. Frame Relay should be selected whenthe Express 6100/6120 is connected to a Frame Relay switch. TheConfiguration/WAN/Frame Relay menu is used for controlling theFrame Relay parameters. When Auto Detect (def) is selected, the Ex-press 6100/6120 will look at the incoming packets in order to deter-mine what layer 2 protocol to use.
