Description: ATM Address of Backup LES/BUS. Specifies the ATM address of the backup LES/BUS for the ELAN. Currently, only the private address formats defined by the ATM Forum are supported, there are three private ATM address formats (Data Country Code (DCC) Format, International Code Designator (ICD) Format, and E.164 Format) and all are modeled after the format of an OSI Network Service Access Point (NSAP), all three private address formats are 20 octets (ATM_PRIVATE_ADDR_OCTETS) in length, and the most significant octet contains an Authority and Format Identifier (AFI) field that identifies the address format (see constants ATM_ADDR_DCC_AFI, ATM_ADDR_ICD_AFI, and ATM_ADDR_E164_AFI), the remaining octets of the address are divided into an Initial Domain Identifier (IDI) and a Domain Specific Part (DSP), the IDI has specific encoding rules that may be enforced by the configurator (see Section 5.1.3 of the ATM Forum UNI Specification).