Nortel Networks Option 11C Network Card User Manual


 
Memory, Storage and CPU capacity Page 41 of 544
Option 11C and 11C Mini Technical Reference Guide
Note 11
The 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 12
The 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