Nortel Meridian 1 option 11C Planning And Installation Manual page 18

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The Main cabinet houses the Small System Controller (SSC) card and can be
connected to up to four Expansion cabinets to increase the line capacity of the
system. Each cabinet provides ten additional Intelligent Peripheral
Equipment (IPE) slots to the system.
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Connectors for cables to the cross-connect terminal are found at the bottom
of each cabinet.
The AUX, SDI and Ethernet connectors are located at the bottom left-hand
side of the cabinets. The AUX port connects auxiliary equipment such as a
Power fail transfer unit (PFTU) to the Option 11C in each cabinet. The SDI
connector in the main cabinet interfaces three SDI ports using a three-port
SDI cable. In expansion cabinets, the SDI connector interfaces with one SDI
port. The Ethernet connector in the main cabinet provides a 10 Mbps Ethernet
port.
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The NTAK11 cabinet is designed to permit natural convection cooling.
Make sure ventilation to the cabinets is not obstructed.
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