User guide

23
6614-2202
Mounting /Removal
Before mounting or removing the unit:
This unit has one separate protective earthing terminal (marked with “symbol” ), while
the unit is provided with two mains supply connectors. The grounding terminal of these
mains supply connectors is a functional earthing point only.
Prevent access to hazardous voltages by disconnecting the unit from AC/DC mains
supplies and all other electrical connections.
A protective earthing conductor should be connected to the protective earthing terminal
and have a cross-sectional area of at least 1.5 mm
2
.
Prevent damage to internal electronics from electrostatic discharges (ESD) by discharging
your body to a grounding point (e.g. use of wrist strap).
Mounting
This unit should be horizontally
mounted with screws in the holes
located in the left and right hand
brackets on the unit.
Connect the protective earthing
conductor to the protective earth-
ing terminal, before connection of any AC/DC
mains supply or other electrical connections.
As this unit uses convection cooling, it is important to avoid obstructions that prevent
normal vertical airflow through the unit. For this reason a clearance of 1U below and
2U above the unit is recommended. These clearance distances should be increased if
heat from another unit is likely to cause an undesirable rise in temperature. Under no
circumstances should the air temperature around the unit exceed 15 degrees C above
the operating temperature of any modem installed in it. The unit should be installed in a
cabinet that has suitable fans and filters so that good airflow is maintained without the
ingress of dirt or dust.
Removal
Disconnect all AC/DC mains supplies and other electrical connections before the
removal of protective earthing conductor from the protective earthing terminal.
Note:
• Always add modems from one end in the rack.
• To ensure proper galvanic connection between front panels, do not leave empty
slots between modems.