Meridian Nortel 1 Option 11C Technical Reference Manual page 69

Note 27
Protected memory requirements for ISDN PRA are as follows:
Per system with DCHIs: P_DCH_TBL = 16 words
Per DCHI: P_DCH_BLOCK = 32 words
If
If DCHI is in "PRA" mode
If DCHI is in "ISL" mode
If DCHI is in "SHARED" mode
Note 28
The equation for calculating the protected memory required for trunk routes
is:
where:
RD = 116 = size(P_ROUTE_DATA)
For each ISA route configured for any IFC, add 10 words for the
ISA_SRVC_BLOCK
Memory, Storage and CPU capacity
1 + M x (# of PRI or 2Mb PRI loops controlled by
DCHI)
where:
M = 24 for PRI, and 31 for 2Mb PRI
1 + (maximum number of ISL trunks defined)
1 + (M x # of PRI/2Mb PRI loops controlled by DCHI)
+ (maximum # of ISL trunks defined)
where:
M + 24 for PRI and 31 for 2Mb PRI
B + (X x 92)
B = 256
X = number of routes actually defined
Option 11C and 11C Mini
Protected call reference table:
Technical Reference Guide
Page 69 of 544