Control Resource Card; Electrical Description; 125 4-L - Mitel SX-200 Practices

4
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CONTROL RESOURCE CARD
4.1. The Control Resource Card (CRC) provides the miscellaneous circuitry required by
the Control Cabinet to support the distributed architecture of the SX-ZOO FD. The
CRC functionally resides between the Main Control Card (MCC) and the Fiber
Interface Modules (FlMs). Removal of the CRC will cause System Fail Transfer
(SFT) to be activated. It will also cause the loss of the Fiber Maintenance Links, the
loss of Terminal and Printer Ports, and the loss of the Floppy Disk Drive Units.
The CRC is located in the rightmost slot of the Control Cabinet next to the Main Control
Card. The card measures 279 mm x 368 mm (11 .O in. x 14.5 in.).
Note: The Control Resource Card is required for the SX-200 FD. It is not available prior to
Generic 1005.
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The Control Resource Card must not be uplugged under power.
4.2
The Control Resource Card provides:
9 Maintenance Port arbitration for local (Control) or remote (Peripheral) maintenance
sessions
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Fiber Maintenance Link multiplexer
. System Fail Transfer signal
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Peripheral RS232 terminal connection
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Controlling circuitry for the 3.5 in. Disk Drive units
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Surge Protection for the Maintenance and Printer Ports
Electrical Description
4.3 A Maintenance Terminal can be connected to the Control Cabinet or to one of the
Peripheral Bays. The Maintenance Port arbitration circuitry monitors the RS-232
Maintenance Terminal Transmit Data lines of the Control Cabinet and the Peripheral
Bays, When the arbitration circuit senses activity (installer or maintenance person
pressing any key) at a peripheral, it switches the terminal connection from the
Control Cabinet to the Peripheral Bay (or viceversa).
9109-096-l 25-NA
Issue 1 Revision 0 125 4-l