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Chapter 2 – Installation
Multi-Tech Systems, Inc. “ZDX”-Style Device Rack – PN S000338A 7
Rack Mounting Installation Procedure
If the chassis is installed in a closed or multi-rack assembly, the operating temperature of the rack
environment may be greater than the ambient temperature. Be sure to install the chassis in an
environment that is compatible with the maximum rated ambient temperature. See Technical
specifications in Chapter 1.
When mounting the equipment in the rack make sure mechanical loading is even to avoid a
hazardous condition, such as loading heavy equipment in the rack unevenly. The rack should safely
support the combined weight of all equipment it supports.
When connecting the equipment to the supply circuit, be sure to check equipment nameplate ratings
to avoid overloading circuits that may cause damage to over-current protection devices and supply
wiring.
Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the
product and to protect if from overheating, maintain a minimum of 1 inch clearance on the tops, and
1 inch clearance on the sides.
Powering Up
Once power is applied to the rack, the modems perform a diagnostic self-test, indicated by the speed
LEDs flashing in sequence for approximately two seconds, then the 19 or 28 (depending on model of
ZDX modem) should light. If none of the modems have power to them, check the power cord connection
and that the AC outlet is live. If one or more of the modems do not power up, check the power connection
to that modem.
If one of the green power supply LEDs on the front of the rack is not on, then one of the redundant power
supplies is defective.
Models with AC power inputs are intended to be used with a three-wire grounding type plug—a plug that
has a grounding pin. Equipment grounding is to ensure safe operation. Do not defeat the grounding
means and verify device is reliably grounded when mounted within a rack.