Carrier Grade GroomerII – Installation Guide
B.3
DC Power requirements
The carrier grade chassis has a DC power option which operates from a nominal -
48VDC supply.
CAUTION
Under no circumstance connect the system to a power source with voltage
different to that stated. Contact your local supplier for advice if your power input is
different to that shown on the rating label.
The system can operate with the following range of DC voltage inputs:
Power input type
DC chassis (Amps)
-48 to -60 VDC
10 Max
The building DC power supply should include a branch circuit breaker rated at no
more than 20A.
A DC chassis is supplied with two DC power cables. Both power cables must be
installed to provide protection from single PSU module failure.
Installation and connection to a DC power supply or DC mains must be performed by
suitably qualified and trained personnel, in accordance with the local regulations and
the current edition of the National Electrical Code or the Canadian Electrical Code.
Adequate securing and strain relief must be provided for the DC input cable in the
end-use installation.
B.4
Circuit definition
The Ethernet (VoIP Traffic and IP signalling), VGA, USB, keyboard, mouse and serial
interfaces are Safety Extra Low Voltage (SELV) circuits. SELV circuits are so
designed and protected that under normal conditions the maximum voltage between
any two accessible circuit parts, one of which may be body or ground, does not
exceed
42.4
volts (peak AC) or
60
VDC, even in the presence of a single fault.
E1/T1 interfaces are Telecommunication Network Voltage (TNV) circuits operating
within the limits of SELV. The E1/T1 interfaces have transient voltage protection
circuits built in.
NOTE
Where equipment is intended to be electrically connected to other
equipment, interconnection circuits shall be selected to provide continued
conformance with the requirements of Clause 2.3 of IEC60950 for SELV
circuits, and with the requirements of clause 6 for TNV circuits, after
making connections between equipment.
NOTE
Make sure that the integrity of the SELV system is maintained when
connection is made through any other interface within the system. If in any
doubt seek competent advice.
B.5
Grounding the system
The system must be grounded as detailed below:
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