Important safety instructions

8The 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.

9Protective 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 mm2.

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.

10Models 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.

11For 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.

12Before 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.

13Do not allow anything to rest on the power cord, and do not locate the product where people will walk on the power cord.

14Do 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.

15General 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.

vi	DSLPipe DSU (SDSL) User’s Guide