Configuring BSC Interactive 10-51 If the TPAD is connecting to a logical X.25 port in the FRM, Atcl must be Y.Explanations of Port ParametersPort Typedefines the protocol the port will support. Selecting this parameter will display a listof valid protocols. (Protocol configuration is described in Chapter 5.)Physical Port Interfaceis determined by the Line Interface Card(s) and attached cables. The RLP record iden-tifies the LIC, and only the valid interfaces will be displayed on the Port screen,among: RS-232, V.35, RS-449, and X.21. (RS-449 and X.21 interfaces are valid if theLIC is RS-422.)Blocked Port Flagwill cause the port to be enabled (N) or disabled (Y) at node IPL. The port will remainin that state until this parameter is changed or an on-line enable ([B], [B], [C] from theMain Menu) or disable ([B], [B], [A] from the Main Menu) is performed.Line Speedis the data transmission rate in bits per second, and the clock speed on a serial portwhen the port is a physical DCE (i.e., the attached I/O cable is DCE). If this port is aphysical DTE, specify the line speed that matches (as closely as possible) that of thedevice connected directly to the port.Retransmission Periodis the length of time before the node will transmit an I-frame if the previous trans-mission is not acknowledged. If the period expires, the timer will be reset and a super-visory frame will be transmitted demanding immediate acknowledgement. TheMaximum Retransmissions counter will also be incremented.The default value of 2000 ms allows avoidance of unnecessary retransmission offrames that have merely been delayed.Maximum Retransmissionsis the maximum number of times the node will attempt to send an I-frame after aRetransmission Period expiration. A larger value for this parameter increases the prob-ability of an eventual successful transmission, but a smaller value permits fasterdetection of a permanent error condition.Table 10-2 BSC Interactive Port Subscriber ParametersParameter Valid Values Default ValueSq (Sequence) 1–16 noneLocal Sub 0–15 characters noneRemote Sub 0–15 characters noneAtcl (Autocall) Y/N (used only on TPAD) 1 NRtytm (Retry Timer) (sec) 15–255 60Rty# (Retry Number) 0–255 0 (indefinite)Conn ID 00–ff none
