Network System Technical Reference Guide

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