Comdial and FXT Spezifikationen Seite 20

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3.2 Understanding The Circuit Boards
The FXT’s board frame and backplane accepts up to eight circuit boards. Two of the board slots are dedicated to
the CPU/Services board and the Auxiliary board while the remaining six slots accept either line or station boards.
Some of the circuit boards (such as the Auxiliary board) hold special-purpose circuit cards that mount directly to
the boards. The line boards are introduced in Section 3.3; station boards in Section 3.4; and card information in
Section 3.6.
The complement of circuit boards in the FXT System includes the following:
Auxiliary Board
A utility board that provides interface for a maximum of three special-purpose circuit cards such as
communications cards, DTMF receiver cards, and synchronizing cards. Actual make-up requirements
depend upon system configuration. In addition, some versions of the auxiliary board provide DTMF
receivers to support outward dialing of a population of industry-standard telephones.
Central Processing Unit (CPU) Board
Provides central processing and control for the system and other miscellaneous functions. The CPU board
has the time switch and conference circuitry and two serial data ports, which have been dedicated for
PC-based programming and a remote maintenance modem.
Memory Card
Provides the memory storage and operating system control. The card mounts directly onto the CPU board,
and is available with four megabytes of memory. The system uses re-programmable random access
memory, known as “flash memory” or “flash RAM”—not the replaceable memory chips, known as
“EPROM.”
Services Board
Provides an interface for music-on-hold and background music inputs; it also provides an output to an
external paging amplifier. The services board includes four dry-contact relays for external control functions.
You can also add up to three additional cards onto the services board for data communications, DTMF tone
receiving, and E1 or T1 synchronization.
3 – 2 General Description
GCA40–215 General Description
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