Nortel DMS-100 Series Maintenance Manual page 21

Maintenance overview 1-5
The universal processor (UP) card (NTMX77) replaces separate master and
signal processor and memory cards. Electrically erasable programmable
read only memory (EEPROM) on the NTMX77 card contains firmware for
downloading. Firmware in EEPROM allows you to load firmware on a
manually busy (ManB) XPM or unit separate from the RAM load. The UP
links some cards through the A-bus. The UP polls each card and sends or
receives messages by direct memory access (DMA). The memory access
protocol is card specified. The following commands allow firmware loading
from the central control (CC) to a ManB XPM to occur.
>LOADFW PM
or
>LOADFW UNIT unit_no
On the C-side of the GPP, 16 DS30A links (6X40AC or AD) can connect
each shelf to a junctored network (JNET). A DS512 link (6X40FA or FB)
can connect each shelf to an enhanced network (ENET). The maximum
C-side channel capacity of a cabinet with four GPP shelves is 1920.
Feature AN1121 allows loop around diagnostics for XPMs with 6X40 cards
at version AD or FB. The enhanced diagnostic checks for missing or failed
6X40AD or FB cards. The diagnostic improves the tests of the interface
section on the 6X41 card. Failure of one 6X40 card does not cause loss of
service. Failure does not occur because links that connect to the matrix
cards are completely redundant through the active unit.
Enter 6X40AD or FB in field PEC6X40 in table LTCINV to activate the
enhanced diagnostics of the 6X40AD and FB cards. The system generates a
PM777 log that contains a card list to indicate faults.
The speech bus formatter card (NT6X41) multiplexes the incoming speech
to a 640-channel bus. Each formatter handles 512 speech channels for each
network plane. The formatter card adds 512 speech channels to 128 internal
service channels. The formatter converts the 512 plus 128 channels to a 640
channel bus to the SMS control complex.
DMS-100 Family SMS Maintenance Manual ISN07, SN07 and up