ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH øÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÑ Âx„|ü@Ž ÑÐ Å@8Ø'@8Ø'Å Ð9.ÁHÁÓÓÃÃProposed additions and revisions to Recommendation M.1050ÄÄ Áà%ÁLINING©UP AN INTERNATIONAL POINT©TO©POINT LEASED CIRCUITƒ Ð € ÐÁHÁThe first sentence of ÀÀ 1 of Recommendation M.1050 should be continued: Ð   ÐÂHHÂ"... in Recommendations M.1020 and M.1025) ÃÃwhich are provided byÄÄ ÃÃanalogue transmission systems or by a mixture of analogue and digitalÄÄ ÃÃsystemsÄÄ."ÆÆ Ð ` Ð Ð Ð ÐÁHÁThe following text should be inserted under the heading "2.1 ÃÃNationalÄÄ ÃÃsectionsÄÄ": ÁHÁ"When analogue access to the circuit is available at the terminal international centre the following tests should be performed regardless of whether the national section is provided by analogue circuit sections or a combination of analogue, mixed and digital circuit sections." ÁHÁThe following text should be inserted under the heading "2.2 ÃÃInternational sectionÄÄ": ÁHÁ"When analogue access to the circuit is available at terminal international centres the following tests should be performed regardless of whether the international section is provided by analogue circuit sections or a combination of analogue, mixed and digital circuit sections." ÁHÁÃÃAddÄÄ the following text after the first sentence of ÀÀ 3 lining up the overall circuit: ÁHÁ"It should be noted that satisfactory impulsive noise performance on a circuit is unlikely to be achieved if the circuit is routed via a primary digital path on which the bit error ratio exceeds 1.10Ãé6*ÄÄ. It is not intended that this digital parameter be measured." ÁHÁÃÃAddÄÄ the following footnote to ÀÀ 3: Ð h Ð"ÃÃ*ÄÄ This parameter is used provisionally and further study is required to assess     whether other parameters (e.g. those in Recommendation G.821) would be more     suitable for relating the performance of transient analogue impairments to     the performance of the digital paths on which the circuits are routed." ÁHÁThe present ÀÀ 3.8 of Recommendation M.1050 should be replaced by the following: "3.8ÁHÁÃÃTotal distortion (special quality circuits only)ÄÄ ÁHÁWhen the circuit includes any digital circuit sections a measurement of total distortion should be made using an instrument complying with Recommendation O.132. Such a measurement will include contributions from quantizing distortion, random noise, harmonic distortion and single tone interference. The minimum signal/total distortion ratio is given in Recommendations M.1020 and M.1025. However, if this minimum ratio is satisfied it should not be assumed that all the parameters which contribute to the measurement are satisfactory. The total distortion measurement is not a substitute for the individual measurements specified in this Recommendation." ÁHÁUnder the heading "4.1 ÃÃNational sectionsÄÄ" insert the same text as given above for ÀÀ 2.1. Similarly under the heading "4.2 ÃÃInternational sectionÄÄ" insert the same text as given above for ÀÀ 2.2. ÁHÁThe same text and footnote given for ÀÀ 3 of this Recommendation should be added to the end of the first paragraph under "4.1.4. Other characteristics (special quality circuits)". ÁHÁThe same text and footnote given for ÀÀ 3 of this Recommendation should be added to the end of the second paragraph under "4.2.4 Other characteristics (special quality circuits)". ÁHÁAs a consequence of the above©mentioned changes the following text has to be inserted under the headings of ÀÀ 2.2 and ÀÀ 4.2: ÁHÁ"When analogue access to the circuit is available at the terminal ÂHHÂinternational centres the following tests should be performed regardless of whether the international section is provided by analogue circuit sections or a combination of analogue, mixed and digital circuit sections."ÆÆ Ð ` Ð ÁHÁThe title of ÀÀ 3.11 should be changed to: Ð X Ð"3.11 ÃÃHarmonic and intermodulation distortion (special quality circuits only)ÄÄ" ÁHÁA new second alinea should be introduced to ÀÀ 3.11 of the Recommendation as follows: ÁHÁ"Alternatively, by bilateral agreement between administrations, a measurement of second and third order intermodulation products using an instrument complying with Recommendation O.42 should be performed. The limit is for further study." ÁHÁThe following amendments should be made to the second line of ÀÀ 10 of Recommendation M.1050: ÁHÁ"If there is a breakdown or planned interruption of a ÃÃtransmissionÄÄ system, rerouting should be carried out as far as possible at group, supergroup or ÃÃdigital linkÄÄ level. This ... distortion. When such a rerouting of ÃÃtransmissionÄÄ links cannot be effected ... should be chosen, in particular with regard to the number of ÃÃFDMÄÄ carrier sections ÃÃand the relative number of analogueÄÄ ÃÃand digital circuit sectionsÄÄ. The procedure ...".