Introduction • 1-5 •
The H.110 Basic Rate ISDN Board
allows for the insertion and removal of boards from a live system. Not
only are there provisions for controlling the electrical signals to prevent
disruption when inserting and removing boards, but also for informing
drivers and applications so that the board resources can be managed as they
are added or deleted. Each H.110 board is provided with a blue LED that
is used to inform an operator when it is safe to insert or remove a board.
1.1.7 Message Passing
The board occupies 8K of memory space on the host PC. This 8K may
reside anywhere within the PC’s address space. As a CompactPCI board,
the address and interrupt of the board is assigned at boot time. The
message passing scheme used by the Infinity Series H.110 BRI Board is
identical to that of the other Infinity Series H.110 boards, allowing for the
easy combination of a variety of Infinity Series H.110 boards in a single
system.
The message passing scheme and message syntax of Infinity Series H.110
boards is similar to that of the older Infinity Series H.100 boards and XDS
series of MVIP and SCbus boards. This facilitates the easy migration from
ISA and PCI systems to designs using CompactPCI boards
1.1.8 Flash EAROM for Firmware
The firmware for both the main processors and for the DSP’s is contained
in Flash EAROM. This allows for easy upgrades of the firmware on the
board in the field without requiring time consuming downloads every time
a system boots. Once reprogrammed, the new firmware is retained even
when the power is removed. The original, factory programmed firmware
is also retained on board and can be accessed by installing a jumper.
1.1.9 EEPROM for Configuration Information
ISDN interfaces can require a substantial amount of information to be
programmed into the system. These includes items such as the SPIDs
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