ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH øÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÑ Âx„|ü@Ž ÑÐ Å°6Ø'°6Ø'Å ÐÓÓÃÃRecommendation K.17ÄÄ 1.ÁHÁÃÃAmendÄÄ Figure 1: Ð   Ð2.ÁHÁPoint 2.1, after the description of Test 3, ÃÃinsertÄÄ the following: Ð à ÐÂHHÂÂX  ÂÁ€ HÁÁ€Á "© Á øÁÃÃTest 1aÄÄ between input terminals of the repeater and conductive housing normally connected to earth in the case of symmetric pair repeaters;ÆÆ ÁHÁ©Âà  ÂÃÃTest 2aÄÄ between output terminals of the repeater and conductive housing normally connected to earth in the case of symmetric pair repeaters.ÆÆ ÁHÁEquipments protected with arresters and installed on symmetrical pair cables, which are induced by a.c. power or traction lines, can be tested with an alternating current, applied for 0.5 second. Current intensity and frequency are comparable to the alternating currents that are likely to be met with in practice, but should not exceed 10 A r.m.s." 3.ÁHÁÃÃAmendÄÄ Figure 3 and Table 1: 4.ÁHÁÃÃAddÄÄ new point 3.3: "3.3ÂhHÂÃÃTest conditions for regenerators and power feeding sources used onÄÄ ÃÃoptical fibre transmission systemsÄÄ ÆÆ ÁHÁThe following tests are applicable for all types of regenerators: ÁHÁIn principle two types of regenerators exist: ÁHÁRegenerators with housings on floating potential and regenerators with housings connected to local earth. The regenerators may also be power©fed via separate d.c.©converters. Both alone standing units may be also considered as one "regenerator" with respect to this Recommendation." 3.3.1ÁHÁÃÃPrototype testsÄÄ 3.3.1.1Á  ÁImpulse tests ÁHÁThese tests will be carried out under conditions listed in column 1 of Table 2/K.17. ÁHÁTests should be applied to equipment as indicated in Figure 5/K.17. ÁHÁ©Á  ÁTest 1 © Between terminals a and b of the power feeding path. ÁHÁ©Âà  ÂTest 2 © Between terminal a of power feeding path and reference earth. ÆÆ ÁHÁ©Á  ÁTest 3 © Between terminal b of power feeding path and reference earth. ÁHÁ©Á  ÁTest 4 © Between both terminals a and b of power feeding path and reference earth. ÁHÁEarth connections of housings with reference earth should be the same as used in practice. 3.3.1.2Á  ÁA.C. Tests 3.3.1.2.1 Short©term a.c. induction ÁHÁThese tests are carried out under conditions listed in Table 3/K.17. ÁHÁTests 1, 2, 3 and 4 should be applied to equipment as indicated in Figure 5/K.17 and explained in ÀÀ 3.3.1.1. 3.3.1.2.2 Steady state a.c. induction ÁHÁThese tests should be carried out in accordance with ÀÀ 2.3 b and equipment should operate during tests without significant increase of bit error rate. ÂHHÂÁ€Á3.3.1.3Á  ÁImmunity test against fast transients induced in the power feeding pathÆÆ ÁHÁThese tests may be carried out to ensure that the regenerator is sufficiently protected against transients occurring in the power feeding path. ÁHÁThese tests should be applied to equipment as indicated in Figure 6/K.17. ÁHÁFor testing a generator, according to IEC, Publication 801©4 should be used. At test voltages up to 1 kV the simulated signal transmission should not be disturbed severely. It is recommended to carry out this test, if the power feeding path is not sufficiently shielded and interferences due to switching in electric power systems may be expected. Ô ñ,ÔŒ3.3.2ÁHÁÃÃAcceptance testsÄÄ ÁHÁOnly impulse tests will be carried out under conditions listed in column 2 of Table 2/K.17. ÁHÁTests 1 and 4 have to be performed taking into account the remarks given in ÀÀ 1.4.