East Coast Datacom Nx8- Dual Composite MUX High-Speed 16-Port TDM Multiplexer, Operation Manual

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The Nx8-DualMUX system is comprised of the following user-accessible modules:
Main Chassis
Power Supplies ( 1 or 2)
Processor Card, Nx64
Port I/O Cards (4)
3.1 Main Chassis
The main chassis includes support for AC mains power entry and distribution, backplane
interconnections of signals and DC power, external port connectors, and mechanical support
for all replaceable cards. Other than the fuse holder, no part of the main chassis should be
disassembled or removed by the user at any time
3.1.1 AC Mains Power
The Nx8-DualMUX accepts power from 85 to 264 VAC, and from 47 Hz to 63 Hz. Power
entry is by means of a standard 3-prong AC line cord with an Earth ground as the 3
rd
conductor.
NOTE: It is very important that the Earth ground be connected to a suitably
grounded outlet.
The IEC Power Entry Module also contains a dual fuse holder. The following fuse ratings are
required for proper and safe operation:
90 - 250V AC, 50/60 Hz:
3.15 Amp, Slow-Blow, Low Clearance, 5mm x 20mm
3.1.2 Chassis rack-mounting
The main chassis is supplied with integral mounting brackets for 19-inch rails. Four mounting
bolts are needed to fasten the unit in the rack. The chassis requires 3U (5.25”) of vertical rack
space for the standard system, and 5U (8.75”) for the redundant power system.
Optional brackets for 23” rails are available from East Coast Datacom, Inc.
3.1.3 Thermal requirements
No special or external forced-air cooling is required. The Nx8-DualMUX system is designed
to be convection-cooled, provided that the ambient temperature meets the system
specification and that airflow at the bottom and top cooling vents are not obstructed.
To prevent obstruction, a solid horizontal surface should not be present any closer than 0.5 “
to the bottom of the chassis, nor any closer than .25” to the top of the chassis. In addition,
care should be taken to insure that airflow from the at least three sides of the unit is
preserved when obstructing surfaces are present. The diagram of Figure 11 depicts
obstructions above and below an Nx8-DualMUX and shows that three sides are open to allow
inflow and outflow of ambient air.