142 Memory calculations
I=
NPA=
lHNPA=
1NPA =
R=
RL=
RLE=
DME=
FCAS =
where:
SDRR =
SDE =
ITGE =
the average number .of digits that must be
inserted as part of digit manipulation
number of NPA (area codes) in the North
American dialing plan
number of 1 + NXX in the home NPA of the SL-1
number of 1 + NPA (area codes) in the North
American dialing plan
the rate of digits equipped in each level of the tree
(translator)
the number of route lists
he average number of route lists entries per
route list
.
the number of distinct digit manipulation entries
(included the default 0th entry)
(N
+ 1) + N(M + 1) +
MN[
4 +
(1OOP
+
15)/16]
N = the number of defined FCAS tables
M = the average number of NPA codes per table
P = the average number of first digit of NXX codes
Number of supplemental digit
restricted/recognized blocks defined for NPA,
NXX, LGC, SPN
Average number of SDRR entries for each SDRR
block
9 x ITEI; where ITEI = the number of
Incoming Trunk Group Exclusion Index
BASICESN =
SIZE
(ESN-DATA-BLoCK)+SIZE
(NCTI-DATA-BLOCK
Memory calculations 553-2201-l 51 Appendix 1
.
.