ADTRAN 1200051L1 User Manual

Also see for ISU 2x64: Using Specifications

Contents

ADTRAN 1200051L1 User Manual Manual pdf 66 page image

Chapter 6. Configuration52 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1DDTR OptionsIgnore DTR causes the ISU 2x64 to disregard the state of the dataterminal ready (DTR) pin. Cmd when Off forces the unit into theAT command processor mode when DTR is not asserted. Toreturn online, DTR must be asserted, followed by the AT0 com-mand. Idle when Off forces the unit to end the current call whenDTR is no longer asserted. Off>On dial #0 allows one callattempt to be automatically established when the DTR signalgoes from inactive to active. While DTR is active, front paneldialing is also possible. When DTR goes inactive, any outgoingcall present is disconnected. Off>On dial #0 uses the phonenumber in stored number register 0 to establish the call. To storea number for automatic dialing, see the section Front Panel DialingOptions. Dial #0 if On allows calls to be automatically estab-lished when the signal is in the active state. The unit attempts toestablish a call using SN0 until the call is established or DTR goesinactive. Answer if On only allows the unit to answer an incom-ing call if DTR is asserted.DSR OptionsDSR forced on causes the data set ready (DSR) signal on the DTEconnector to always be asserted. Off Idle+Test causes the DSR tobe disasserted if the ISU 2x64 is in test or there is not an activecall. Off Link Down causes the DSR signal to be disassertedwhen the ISDN interface is not ready.Flow Control (asynchronous data format)Selecting Hardware Flow (see Figure 6-18) allows the ISU 2x64received data to be presented to the DTE interface only when RTS(request to send) is asserted and allows DTE transmit data to bepresented to the 2x64 when CTS is asserted. Software Flow con-trol uses XON/XOFF inband to control data transferred betweenthe DTE and the ISU 2x64. Selecting No Flow Ctrl disables flowcontrol. Either Hardware of Software flow control should be usedwhen asynchronous BONDING or DTE rates higher than theeffective loop rate are used (i.e., 115.2 kbps over 112 kbps looprate).