Meridian Nortel 1 Option 11C Technical Reference Manual page 41

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:
DCH_U_BLOCK
Output Request Buffers
Output Buffer
Input Buffer
Unprotected call reference table
Unprotected message link table
M is computed for each DCHI, depending on Mode, as follows:
PRA Mode
ISL Mode
Shared Mode
2Mb PRI only: unprotected data block = 91 words.
Memory, Storage and CPU capacity
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)
M = maximum number of ISL trunks defined
M = the sum of the values for PRA and ISL mode
Option 11C and 11C Mini
60 words
5 x number of OTBFs
(LD 17)
261 words
261 words
2 + M
1 + M
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Technical Reference Guide