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Chapter 5: Configuration
30 ISU 512 User Manual 61202.086L1-1
Setting the LDN
The local directory number (LDN) is used when placing or receiving BOND-
ING calls. The LDN is the local phone number assigned to the line. This option
allows the entry of up to eight LDNs.
Use the Up and Down arrows to select the LDN to enter. LDNs correspond to
the IFC connectors on the rear of the ISU 512 as follows:
IFC #1 LDN 1 (pair with SPID 1) and LDN 2 (pair with SPID 2)
IFC #2 LDN 3 (pair with SPID 3) and LDN 4 (pair with SPID 4)
IFC #3 LDN 5 (pair with SPID 5) and LDN 6 (pair with SPID 6)
IFC #4 LDN 7 (pair with SPID 7) and LDN 8 (pair with SPID 8)
Press Enter to select the LDN and use the keypad to enter the LDN number.
While keying/editing an LDN, the Up arrow allows backspacing through the
number string to correct mistakes. The Down arrow scrolls back to the last
digit entered. To cancel a number, use the Up arrow to backspace through the
number, then press Enter. After entering each LDN, press Enter.
Disconnect the network interfaces from the unit before initially entering or altering the
SPIDs and LDNs.
If only one SPID is provided for each line, enter the LDN(s) as follows:
IFC #1 LDN 1 and LDN 2 (pair with SPID 1)
IFC #2 LDN 3 and LDN 4 (pair with SPID 3)
IFC #3 LDN 5 and LDN 6 (pair with SPID 5)
IFC #4 LDN 7 and LDN 8 (pair with SPID 7)
Dial Options
The ISU 512 can be configured to dial using the front panel (default), EIA-366
parallel dialing port, or V.25 bis; see Figure 5-2.