Meridian Nortel 1 Option 11C Technical Reference Manual page 60

Page 60 of 544 Memory, Storage and CPU capacity
Note 7
553-3011-100 Standard 14.00
SDE = average number of SDRR entries for each SDRR block
ITGE = 9 x ITEI, where ITEI is the number of Incoming Trunk Group
Exclusion Index
This number is based on the assumption that the NPA/NXX translation tree
is half full and distributed evenly. This should represent the typical case. For
a more precise calculation, use the NARS formula.
The protected data store requirements for NARS (on a per customer basis)
are:
BASIC_ESN + SUM1 + SUM2 + SDRR x (3 + 2 x SDE) +
RL x (8 + 3 x RLE) + DME x (4 + I/E) + LOC x 6 + FCAS + SCC +
ITGE + MDID
where:
BASIC_ESN = Size(ESN_DATA_BLOCK) +
Size(NCTL_DATA_BLOCK)
Size(ESN_DATA_BLOCK) = 131
Size(NCTL_DATA_BLOCK) = 306
SUM1 = (SUM of network translator 1)
SUM2 = (SUM of network translator 2)
SUM = 11 x [(10 x R) x n] - 1
(10 x R) - 1
n = maximum level of tree (n > 0)
R = the rate of digits equipped in each level of the tree (translator)
RL = number of route lists
RLE = average number of route lists entries per route list
DME = number of distinct digit manipulation entries (including the
default 0th entry)
January 2002