Nortel Circuit Card 311 Reference page 993

The main functional blocks of the NTBK51 architecture include the following:
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Microprocessors
One microprocessor handles data transfer between each serial interface
and software, reports the status of each port and takes commands from the
software to control the activities of the ports. A high performance MPU
supports the D-channel from the PRI card and other software applications
running simultaneously on other ports of the DDCH card.
The microprocessor performs the following functions:
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•
•
•
One microprocessor handles data transfer between each serial interface
and software, reports the status of each port and takes commands from
software to control the activities of the ports. A high performance MPU
supports the D-channel from the PRI card and other software applications
running simultaneously on other ports of the DDCH card.
The microprocessor performs the following functions:
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Copyright © 2003-2008, Nortel Networks
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Microprocessors
Main memory
Shared memory
EPROM memory
Flash EPROM memory
EEPROM memory
Serial communication controller
Sanity timer
Bus timer
sanity check and self tests
message handling between the CS 1000E, CS 1000M Cabinet, and
Meridian 1 PBX 11C Cabinet and the card
four port serial communication controller handling with Direct Memory
Access (DMA)
program download from the Small System Controller
Sanity check and self tests
Message handling between the Option 11C and the card
Four port serial communication controller handling with DMA
Program download from Option 11C CPU
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Functional description 993