ACCULINK 3360, 3364, and 3365 E1 NTUD-4 March 1999 3360-A2-GB20-30COM Port InterfaceThe COM port connects to a PC for front panelemulation, to an ASCII terminal or printer for alarms, to anetwork device (e.g., a router) for SNMP applications, tothe SNMP LAN Adapter for SNMP applications, or toanother E1 NTU’s AUX port for daisy chain connectivity.(The SNMP LAN Adapter includes the cable that isneeded to attach it to the E1 NTU.) The COM portconnector is an 8-position keyed modular connector(Table D-4). The data signals on this port are referenced toa DTE interface.The COM port-to-PC cable is shown in Figure D-2 andthe COM port-to-terminal/printer cable is shown inFigure D-3.NOTEFor daisy-chaining an AUX portto a COM port, a customersupplied, 8-pin-to-8-pin, straight-through cable is required andthe appropriate configurationoptions (Com Use and Aux Use)must be set to Daisy. Wheneverthe cable is connected ordisconnected, you shouldchange the Daisy selection toensure that the correctparameters have beennegotiated for the link layer.Table D-4COM Port ConnectorSignal Direction Pin NumberDCE Transmit Clock From NTU 1DCE Receive Data From NTU 2Signal Ground — 3DCE Transmit Data To NTU 4DCE Data Terminal Ready To NTU 5DCE Carrier Detect From NTU 6DCE Request-to-Send To NTU 7DCE Receive Clock From NTU 8
