By default, the SunATM software attempts to obtain the LECS address using ILMI, as specified in the LAN Emulation specification. If this is not successful, the "well-known" ATM address, also specified by the ATM Forum, is used.
If your LECS uses a different ATM address (not the well-known address), and does not make that address available via ILMI, specify it using this parameter. If applicable, any of the ATM address variables described in "ATM Address Formats and Variables" can be used. Use variable $prefix, in particular.