Nortel 1000 Features And Services Fundamentals page 507

1. Example 1: No re-configuration
2. Example 2: Re-configuration
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A 2-group system serving an office is expected to convert 400 analog
sets to CLASS sets. Currently, 100 of them are located in group 0,
where all incoming trunks are located, and the remaining 300 sets are in
group 1. Assume that group 1 is also equipped with 800 non-CLASS
sets. How many CMOD units are needed to serve this application and
does the customer need to re-configure the switch (move sets and
trunks between group 0 and group 1) to do the upgrade?
Solution:
The table lookup indicates that 400 CLASS sets need 10 CMOD units.
Since one pack provides 32 units, one XCMC pack is sufficient for this
customer.
Group 1 is equipped with 300 CLASS sets which is greater than the 100
sets in group 0, the pack should be installed in group 1.
The total equipped ports in group 1 is 1100 (=800+300). For a 2-group
system, the second group is allowed to have 1760 sets (from
"Maximum CLASS sets per group (based on inter-group junctor capacity
limitation)" (page 503)) without junctor traffic concerns, therefore, there
is no need for the customer to re-configure the switch.
A similar application as in the last example, except that there are 1600
non-CLASS sets and 100 trunks in group 1.
Solution:
The same number of CMOD units (10), since the number of CLASS sets
in the system is the same.
The number of total equivalent sets in group 1 is 2300 (=1600 +300
+100x4) which is greater than the 1760 threshold in the
"Maximum CLASS sets per group (based on inter-group junctor capacity
limitation)" (page 503)
The customer will have a number of alternatives to resolve the junctor
blocking issue, depending on the situation:
(1) move the 100 CLASS sets from group 0 to group 1, so all CLASS
sets are served by the XCMC pack in group 1, or
(2) move the 300 CLASS sets and the XCMC pack to group 0, or
(3) move 540 non-CLASS sets (=2300-1760) from group 1 to group 0, or
(4) move 100 CLASS sets from group 1 to group 0 and split the 10
CMOD units to 5 for group 0 and 5 for group 1. However, this will
require another XCMC pack to be equipped in group 0. The cost of this
approach is not trivial. It can be justified only when growth plan indicates
a need for a second pack in the near future anyway.
Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
for a 2-group system.
Feature description 507
Table 9
Table 9