Memory,Storage and CPU capacity Page41 of 544
Option11C and 11C Mini TechnicalReference Guide
Note 11The size of Input/Output buffers is specified in “messages”. Each message
uses 4 words of unprotected data store. The recommended size for I/O buffers
is:
LPIB (Low Priority Input Buffers) = 96 messages
HPIB (High Priority Input Buffers) = 32 messages - single group 32 x #
groups - multi-group
PBXOB (Non-SL-1 Output Buffer) = 160 messages
BCSOB (SL-1 Output Buffer) = 160 messages
Note 12The DCHI supports both 1.5 Mb PRI and 2.0 Mb PRI.
Each DCHI consists of the following unprotected data blocks:
M is computed for each DCHI, depending on Mode, as follows:
2Mb PRI only: unprotected data block = 91 words.
DCH_U_BLOCK 60 words
Output Request Buffers 5 x number of OTBFs
(LD 17)
Output Buffer 261 words
Input Buffer 261 words
Unprotected call reference table 2 + M
Unprotected message link table 1 + M
PRA Mode M = NChan x [Highest Loop Interface ID(defined in LD 17 by PRI
111 nn)(zero if not defined)+ 1 (for primary channel_+1 (if
backup channel is on)
ISL Mode M = maximum number of ISL trunks defined
Shared Mode M = the sum of the values for PRA and ISL mode