Nortel Meridian 1 Option 11C, Administration And Maintenance

Page: 194 / 507

Page 180 of 492 Chapter 5 — ISDN BRI line and packet data implementation
553-3011-311 Standard 7.0 May 1999
Before layer 3 terminal initialization can start, the terminal must have its
SPID entered at the terminal. The TEI may be dynamic (the MISP
automatically assigns an unassigned TEI) or static (the TEI in manually
entered on the terminal key pad)
Layer 3 initialization starts when the terminal transmits its SPID to the MISP
using an information message. The MISP acknowledges the message and
assigns a TSP to the terminal.
Non-initializing terminal with dynamic TEI assignment
A non-initializing terminal (such as a printer) does not support the dynamic
endpoint identification procedure and is not associated with a SPID number.
However, non-initializing terminals may support dynamic TEI assignment
where the MISP automatically assigns an unassigned TEI when the terminal
is installed or when the system or the cards are reset.
The range of the automatically assignable TEI numbers is from 64 to 126.
Because these terminals do not support layer 3 initialization procedures, the
MISP assigns the same default TSP to all terminals of this type on a specific
DSL. The default TSP is defined by specifying USID= 0 in overlay 27.
Non-initializing terminal with static TEI assignment
A non-initializing terminal (such as a printer) does not support the dynamic
endpoint identification procedure and is not associated with a SPID number.
The non-initializing terminals may support static TEI assignment where the
user assigns an unassigned TEI by entering the TEI number on the terminal
key pad when the terminal is installed or when the system or the cards are
initialized.
The static TEI assignment is performed by entering an unassigned TEI
number from 0 to 63 directly into the terminal using its key pad. Because
these terminals do not support layer 3 initialization procedures, the MISP
assigns the same default TSP to all terminals of this type on a specific DSL.
The default TSP is defined by specifying USID= 0 in overlay 27.
Figure 23 shows different types of terminals and their relationship to each
other when they are connected to the same DSL. It also shows how the
terminal initialization parameters are handled for different types of terminals.