Instruction manual

Page 1112 of 3156 CLASS: Calling Number and Name Delivery
553-3001-306 Standard 10.00 January 2002
Re-configuration may be required (when engineering rules are
not fully followed)
When above rule (2) can not be satisfied in a new site or an existing one, the
following guidelines are designed to minimize network blocking, and to
determine whether a re-configuration (to move trunks and sets around) or to
provide an XCMC pack per group is necessary.
1 To use Table 39 to estimate CMOD unit requirements, consider only
CLASS sets (no trunks or non-CLASS sets).
2 If CLASS sets are equipped in more than one group, locate the XCMC
IPE pack in the group with most CLASS sets.
3 Use Table 38 to decide whether re-configuration is required. For a
network group with trunks, regular sets and CLASS sets, convert trunks
to sets by using the formula: 1 trunk = 4 sets (called equivalent sets), and
then add up the total.
Check threshold in Table 38, if the number of equivalent sets is less than
1760 (e.g., for a two-group system), there is no need to re-configure the
system.
If the number is greater than 1760, we need to move some of the CMOD
units to a second XCMC IPE pack on another group (when CLASS sets
are scattered in two groups), or move some sets or trunks from one group
to another group to satisfy the threshold.
The following examples will show some of the engineering details of dealing
with various alternatives.
To simplify discussion, the network group 0 has minor number of CLASS
sets. The majority of CLASS sets are in group 1 (refer to Figure 30).
Engineering examples
One XCMC pack serving a single group system
No special engineering rule is needed for a single group system (Meridian 1
Option 51C or 61C). Look up Table 39 to find the required number of CMOD
units to serve the given CLASS sets. For example, to serve an Option 61C
with 400 CLASS sets, use Table 39 to find the number of CMOD units
serving a range including 400 sets. The result is 10 units which can serve 333
to 401 CLASS sets.