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Network Prefix
The fields that make up the Network Prefix part of an ATM address include:
AFI
The one-byte AFI identifies the authority allocating the portion of the address that follows. It
defines the structure of the NSAP format. The AFI values accepted by the workgroup switch
ATM subsystem are as follows:
39 (ATM format of the Domain-Specific Part)
45 (ATM format of the E.164 Initial Domain Identifier)
47 (ATM format of the International Code Designator).
DCC
Data Country Code (2 bytes)
Specifies the country in which the address is registered. The codes are given in ISO-3166.
This value is handled as a bit mask and is not checked by the ATM subsystem.
DFI
Domain-specific Format Identifier (1 byte)
Specifies the structure, semantics, and administrative requirements for the remainder of the
address.
This value is handled as a bit mask and is not checked by the ATM subsystem.
AA
Administrative Authority (3 bytes)
Identifies the organizational entity that allocates addresses for the remainder of the
domain-specific part.
This value is handled as a bit mask and is not checked by the ATM subsystem.
E.164
E.164 IDI (8 bytes)
Specifies the international addressing format used by B-ISDN public transport providers and
is up to 15 digits long (BCD syntax). This field is padded with leading '0000' semi-bytes to
reach the maximum length. A closing semi-byte '1111' is used to obtain an integral number
of bytes.
This code is handled as a bit mask and is not checked by the ATM subsystem.
ICD
International Code Designator (2 bytes)
Identifies an international organization. Values and codes (BCD syntax) are assigned by the
ISO-6523 registration authority.
This code is handled as a bit mask and is not checked by the ATM subsystem.
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IBM 8285 Nways ATM Workgroup Switch:
Installation and User’s Guide
Summary of Contents for 8285 Nways
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