OSI/AS Configuration and Management Manual

NSAP Addressing

OSI/AS Configuration and Management Manual—424119-001

3-17

Example 3: Locally Defined and ISO 646 DSP

Figure 3-6 shows the third example NSAP address and its components.

The AFI in this example is 50. Table 3-1

on page 3-10 shows that an AFI value of 50

identifies the IDI format as locally defined and the DSP syntax type as ISO 646

character.

Table 3-2

on page 3-11 shows that a locally defined format has a null IDI length.

The DSP is the rest of the address. Table 3-3

on page 3-12 shows that the ISO 646

character DSP syntax for a locally defined format can have a maximum of 19 characters;

this example has the maximum length. The meanings of the DSP values in this example

must be determined by a local addressing authority, Network Address Committee “Z,”

and are not included in this example.

The same address, represented in the nonstandard format defined by Committee Z,

might be as follows:

50 ABCDEFGHIJKLMNOPQRS

The encoding process for this example NSAP actually follows the binary encoding rule

for ISO 646 character DSP syntax. Notice that each pair of hexadecimal digits does not

resemble its ISO 646 character code (in other words, the digits “21” do not resemble the

character code for “A”).

Figure 3-6. NSAP Address Example 3

036CDT .CDD

NSAP Address

/5021222324252627282930313233343536373839

AFI (IDI null) DSP