Instruction manual

Page 1120 of 3156 CLASS: Calling Number and Name Delivery
553-3001-306 Standard 10.00 January 2002
One XCMC pack serving a 3-5 group system
Chances of groups larger than three requiring special engineering are slim,
since the threshold (Table 38) limiting the number of sets per group is much
higher.
If the rule of co-locating CLASS sets and CMOD units in the same group is
not fully met, as long as basic rule like putting XCMC pack in the group with
most CLASS sets is followed, perhaps, no re-configuration between any two
groups is necessary.
However, if in doubt, isolate any two groups at one time, and go through the
two-group engineering procedure to re-configure the system two groups at a
time. Ignore the rest of system during the engineering process, except for
calculating the total number of CMOD units, which should cover the need of
all CLASS sets in the system. However, during a two-group engineering, only
the number of CMOD units attributable to the two-group at hand should be
used in calculations.
Also remember to use 2933 (equivalent) sets per group for threshold check-
off for the three-group system, and their respective number for four- and five-
group systems (Table 38).
The complete check-off of set threshold between any two groups in a multi-
group system can be represented by the following combinations (a number
denotes the group number: e.g., 1-2 represents group one-group 2):
three-group: 1-2, 1-3, 2-3.
four-group: 1-2, 1-3, 1-4, 2-3, 2-4, 3-4.
five-group: 1-2, 1-3, 1-4, 1-5, 2-3, 2-4, 2-5, 3-4, 3-5, 4-5.
It should be noted that although CMOD units are equipped according to the
traffic requirement of CLASS sets in a network group for the inter-group
junctor traffic consideration, they are a system resource shared by the whole
system.