Nortel Communication Server 1000 Manual page 39

If the MSDL is used, standard mode can have a range of 0-63, and can be
any of the following:
•
Q.931 (DCHI)
•
ISL (DCHI)
•
ESDI
Expanded address mode (0-159) can be either of the following:
•
DPNSS1 (DDSL)
•
DASS2 (DDSL)
The expanded mode addressing has no impact on the standard mode
addressing, that is, DASS2 D-channel (DDSL) 7 in the expanded mode
can exist with the Q.931 D-channel (DCHI) 7 in the standard mode.
Theoretically, it is possible to have 64 addresses using the MSDL with
Q.931, ISDL, or ESDI, plus 160 addresses using the expanded mode
for DPNSS1 for a total of 224 addresses. In practise, however, there
is a limit of 64 addresses using MSDL with Q.931, ISDL, or ESDI, plus
40 addresses using the expanded mode for DASS2, for a total of 104
addresses.
Presently, MSDL does not support SDI ports on DASS2, so the likely
configuration would involve a mixture of standard mode addressing,
MSDL addressing, and expanded mode addressing for DPNSS1. Such an
example could be as follows:
0-7 (8 addresses) in the standard mode;
8-15 (32 addresses) in the MSDL mode;
16-55 (40 addresses) in the expanded mode.
The port address numbers assigned to the NT5K75 and NT6D11AE/AF
operating in expanded mode must not conflict with addresses assigned to
other I/O port types. To avoid potential conflicts and to simplify system
configuration, it is recommended that, in the expanded mode, the port
addresses for the NT5K75 and NT6D11AE/AF avoid the standard mode
range (0-15) and be numbered in the range 16-159 instead.
Figure 9 "A typical DASS2 hardware configuration" (page 40)
typical DASS2 hardware configuration.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
DASS2 hardware requirements 39
illustrates a