Important safety instructions
vi
DSLPipe DSU (SDSL) User’s Guide
8
The power source has to be adequately rated to assure safe operation of the
equipment. The building installation and/or power source must provide overload
protection.
9
Protective earth (PE) connection is essential to ensure safe operation before
connecting to the power supply and telecommunication network. Do not defeat
the purpose of the grounding-type plug by modifying the plug or using an
adapter. Use an outlet tester or a voltmeter to check the ac receptacle for the
presence of earth ground. If the receptacle is not properly grounded, the
installation must not procede until a qualified electrician has corrected the
problem.
If the power supply is fed from a power source with no protective-earthing path
(such as in certain Nordic countries), connect an earth-grounded copper wire to
the dedicated wiring terminal marked with
(PE symbol) on the chassis. The
minimum size of the wire for a DSLPipe V.35 unit with rated input current not
exceeding 6A is AWG 18 and cross-sectional area 0.75 mm
2
.
Models with ac power inputs are intended for use with a single-phase three-wire
power cord (which includes earthing conductor).
For models with dc power inputs, the protective earth connection must be
established by using the dedicated earthing terminal marked with the PE symbol
or, if provided, the earthing pin of the input terminal block.
10 Models with dc power inputs must be connected to a -48V dc supply source that
is electrically isolated from the ac source in accordance with UL1950, C22.2 No.
950, and IEC60950.
11 For products installed in Nordic countries (except Central Office equipment), a
type B plug or permanent connection must be used for connections to the main
power supply.
12 Before installing wires to the dc power terminal block, verify that these wires are
not connected to any power source. Installing live wires (that is, wires connected
to a power source) is hazardous.
13 Do not allow anything to rest on the power cord, and do not locate the product
where people will walk on the power cord.
14 Do not attempt to service this product yourself. Opening or removing covers can
expose you to dangerous high voltage points or other risks. Refer all servicing to
qualified service personnel.
15 General purpose cables are provided with this product. Special cables, which
might be required by the regulatory inspection authority for the installation site,
are the responsibility of the customer.
