OSI/TS Configuration and Management Manual

Background Information About Addressing
OSI/TS Configuration and Management Manual—424831-001
2-15
Example 3: Locally Defined and ISO 646 DSP
The meanings of the DSP values in this example are determined by a local addressing
authority, Network Address Committee “Y,” and are as follows:
Example 3: Locally Defined and ISO 646 DSP
Figure 2-6 shows the third example NSAP address and its components.
The AFI in this example is 50. Table 2-1
shows that an AFI value of 50 identifies the
IDI format as locally defined and the DSP syntax type as ISO 646 character.
Table 2-2
shows that a locally defined format has a null IDI length.
The DSP is the rest of the address. Table 2-3
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
This position ...
Means (According to
Committee Y) ...
And Has This Value in This
Example ...
8 binary octets (unknown meaning) 0102030405060708
12 hex. digits IEEE MAC address of the local
system
08008E0002E3
2 hex. digits NSAP selector on local end
system
01
Note. This example, showing an embedded MAC address in the NSAP address, does not
imply that the MAC address is used by the existing Network Layer protocols, nor does it imply
that the practice is recommended. However, such embedding is often used.
Figure 2-6. NSAP Address Example 3
206CDT .CDD
NSAP Address
/5021222324252627282930313233343536373839
AFI (IDI null) DSP