Chapter 6. Configuration61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 33Setting the LDNThis option allows the entry of 0, 1, or 2 LDNs. The LDN is usedwhen receiving BONDING calls or receiving separate calls foreach DTE connection. The LDN is the seven-digit local phonenumber assigned to the line.When entering an LDN using the front panel, use the Up andDown arrow keys to select between LDN DTE#1 and LDNDTE#2. Press Enter to select the DTE. Use the keypad to enterthe LDN. The Up and Down arrow keys edit the number if nec-essary. To store the number press Enter. To cancel a number, usethe Down arrow to backspace through the number, then pressEnter. After entering each LDN, press Enter. To abort changes atany time, press Cancel. The changes are discarded, leaving theoriginal number unchanged.When using a VT 100 terminal, select the option number corre-sponding to the appropriate DTE and press Return.SPID and LDN numbers are entered in pairs and should not becrossed between the two DTE ports. Each SPID has a uniqueLDN. Enter a SPID-LDN pair for DTE#1 and a separate SPID-LDN for DTE#2. Ensure that the SPID for DTE#1 matches theLDN for DTE#1, and the SPID for DTE#2 matches the LDN forDTE#2.Disconnect the network interface from the unit before initially entering and/or altering the SPIDs or LDNs.Setting the Busy Out PortThe Busy Out Port is recommended for use in Hunt Group appli-cations only. This option allows the ISU 2x64 to command theswitch to no longer route calls to the 2x64. The Busy Out Portrequires the ISDN line to be configured by the telephone com-pany to support the Make Busy feature and a feature buttonnumber to be assigned for activating and deactivating busy sta-tus.
