1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.983.3TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(06/2002) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access networks A broadband opti
2、cal access system with increased service capability by wavelength allocation Amendment 1 ITU-T Recommendation G.983.3 (2001) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHA
3、RACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH
4、 METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.90
5、9 Parameters for optical fibre cable systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM transmission bearers G.940G.949 Di
6、gital line systems G.950G.959 Digital section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Access networks G.990G.999 QUALITY OF SERVICE AND PERFORMANCE G.1000G.1
7、999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) i ITU-T Recommendation G.983.3 A broadband optical access syste
8、m with increased service capability by wavelength allocation Amendment 1 Summary ITU-T Rec. G.983.1 on “Broadband optical access systems based on passive optical networks (PON)“ describes systems with transmission rates of 155.52 or 622.08 Mbit/s downstream and 155.52 Mbit/s upstream. G.983.1 Amendm
9、ent 1 allows enhancement to include 622.08 Mbit/s upstream. ITU-T Rec. G.983.3 which describes “Broadband Passive Optical Network (B-PON) systems with increased service capability by wavelength allocation“ could not take account of Amendment 1/G.983.1. This Amendment describes modifications to the r
10、equirements for isolation and return loss in G.983.3 made necessary because of the power budget changes needed for 622.08 Mbit/s upstream rate. Source Amendment 1 to ITU-T Recommendation G.983.3 was prepared by ITU-T Study Group 15 (2001-2004) and approved under the WTSA Resolution 1 procedure on 13
11、 June 2002. ii ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible fo
12、r studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T stud
13、y groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis
14、with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of thi
15、s Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date
16、 of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult
17、the TSB patent database. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) iii CONTENTS Page 1) Introduction 1 2) Modifications to ITU-T Rec. G.983.3 1 2.1) Scop
18、e 1 2.2) References 1 2.3) Clause 8.3.1 1 2.4) Clause I.2 3 2.5) Clause IV.2.5 4 2.6) Clause IV.3.1 5 2.7) Subclause IV.3.1.1 5 2.8) Subclause IV.3.1.2 6 2.9) Sublause IV.3.1.3 . 6 2.10) Clause V.2.1 . 7 2.11) Clause V.2.2 . 8 ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) 1 ITU-T Recommendation G.983.3
19、A broadband optical access sytem with increased service capability by wavelength allocation AMENDMENT 1 1) Introduction This amendment describes modifications to the requirements for isolation and return loss in ITU-T Rec. G.983.3 to align with ITU-T Rec. G.983.1 Amemdment 1 on 622.08 Mbit/s upstrea
20、m bit rate operation. 2) Modifications to ITU-T Rec. G.983.3 2.1) Scope All words of “G.983.1“ in Scope should be replaced by “G.983.1 and G.983.1 Amendment 1“. 2.2) References Change the reference 2 as follows: 2 ITU-T Recommendation G.983.1 (1998), Broadband optical access systems based on Passive
21、 Optical Networks (PON). Also refer to the Corrigendum 1 (July, 1999) and Amendment 1 (Nov., 2001). 2.3) Clause 8.3.1 The list of options in 8.3.1 should be updated to include the following items: Option 1: Symmetric 155.52 Mbit/s. Option 2: Asymmetric 155.52 Mbit/s upstream / 622.08 Mbit/s downstre
22、am. Option 3: Symmetric 622.08 Mbit/s. Table 3 and its associated texts are modified to include the following items: Table 3/G.983.3 Relation between parameter categories and tables Transmission direction Nominal bit rate Table Downstream 155.52 Mbit/s Table 4b (downstream, 155 Mbit/s) 622.08 Mbit/s
23、 Table 4c (downstream, 622 Mbit/s) Upstream 155.52 Mbit/s Table 4d (upstream, 155 Mbit/s) 622.08 Mbit/s Table 4e (upstream, 622 Mbit/s) All parameters are specified as follows, and shall be in accordance with Table 4a (ODN), Table 4b (downstream, 155 Mbit/s), Table 4c (downstream, 622 Mbit/s), Table
24、 4d (upstream, 155 Mbit/s), and Table 4e (upstream 622 Mbit/s). These tables are generally called Table 4 in this Recommendation, if no confusion is possible. There are 9 kinds of ONUs. They are distinguished by downstream and upstream bit rates of 155.52 Mbit/s and 622.08 Mbit/s and by optical path
25、 loss of Class A, Class B, and Class C (defined in ITU-T Rec. G.982). Some parameters described in Table 4 are described in Appendix I as examples for implementation. 2 ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) Add Table 4e/G.983.3 as follows: Table 4e/G.983.3 Optical interface parameters of 622 Mbi
26、t/s upstream direction Items Unit Specifications ONU Transmitter (optical interface Oru) Nominal bit rate Mbit/s 622.08 Operating wavelength nm 1260-1360 Line code Scrambled NRZ Mask of the transmitter eye diagram See Figure 7/G.983.1 Maximum reflectance of equipment, measured at transmitter wavelen
27、gth dB Less than 6 Minimum ORL of ODN at Oruand Ord(Notes 1 and 2) dB More than 32 ODN Class Class A Class B Class C Mean launched power MIN dBm (Note 5) (Note 5) (Note 5) Mean launched power MAX dBm (Note 5) (Note 5) (Note 5) Launched optical power without input to the transmitter dBm less than Min
28、 sensitivity 10 Extinction ratio dB More than 10 Tolerance to the transmitter incident light power dB More than 15 If MLM Laser Maximum RMS width (Note 3) nm MLM type 1: 1.4 MLM type 2: 2.1 MLM type 3: 2.7 If SLM Laser Maximum 20 dB width (Note 4) nm 1 If SLM Laser Minimum side mode suppression rati
29、o dB 30 Jitter transfer See Figure 8/G.983.1 Jitter generation from 0.5 kHz to 1.3 MHz UI p-p 0.2 OLT Receiver (optical interface Olu) Maximum reflectance of equipment, measured at receiver wavelength dB Less than 20 Bit error ratio Less than 1010ODN Class Class A Class B Class C Minimum sensitivity
30、 dBm (Note 5) (Note 5) (Note 5) Minimum overload dBm (Note 5) (Note 5) (Note 5) Consecutive identical digit immunity bit More than 72 Jitter tolerance NA Tolerance to the reflected optical power dB Less than 10 ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) 3 Table 4e/G.983.3 Optical interface parameters
31、 of 622 Mbit/s upstream direction NOTE 1 The value of “minimum ORL of ODN at point Oruand Ord, and Oluand Old“ should be more than 20 dB in optional cases which are described in Appendix I/G.983.1. NOTE 2 The values of ONU transmitter reflectance for the case that the value of “minimum ORL of ODN at
32、 point Oruand Ord, and Oluand Old“ is 20 dB are described in Appendix IV. NOTE 3 Transmitter types meeting narrower spectral width specifications are allowed wider central wavelength ranges. The specified laser types produce less than 1 dB of optical path penalty over the ODN. Lasers with different
33、optical parameters may be substituted provided that: 1) the total wavelength range does not exceed 1260 nm to 1360 nm; and 2) any increase in optical path penalty over 1 dB is compensated by an increase of the minimum transmitted launch power or a decrease of the minimum receiver sensitivity. For in
34、teroperability, the specified laser types with less than 1 dB optical path penalty are recommended. NOTE 4 Values of maximum 20 dB width, and minimum side mode suppression ratio are referred to in ITU-T Rec. G.957. NOTE 5 Tentative parameters are described in Appendix I 2.4) Clause I.2 Change the de
35、scription as follows: Specified numerical values described in the following tables indicate tentative values for items described in Table 4 of Recommendation G.983.3. Tables I.1 to I.4 are based on case 2 described in Appendix II of Recommendation G.983.3. Table I.5 is based on case 4 because the up
36、stream signals pass through fewer WDM filters than case 2 and can be relaxed on their ODN attenuation. Add Table I.4/G.983.3 and Table I.5/G.983.3 as follows: Table I.4/G.983.3 Optical interface parameters of 622 Mbit/s upstream direction ODN Class Items Unit Class A Class B Class Ca)ONU Transmitter
37、 (optical interface Oru) Mean launched power MIN dBm 7.5 2.5 2.5 Mean launched power MAX dBm 1 +4 +4 OLT Receiver (optical interface Olu) Minimum sensitivity dBm 28.5 28.5 33.5 Minimum overload dBm 6 6 11 a)The values proposed for upstream Class C are best estimates. They are therefore subject to ch
38、ange in the future. 4 ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) Table I.5/G.983.3 Optical interface parameters of 622 Mbit/s downstream and upstream directions based on case 4 described in Appendix II ODN Class Items Unit Class A Class B Class C OLT Transmitter Mean Launched Power MIN dBm 5.5 0.5 0.
39、5 Mean Launched Power MAX dBm 1 +4 +4 ONU Receiver Minimum Sensitivity dBm 26.5 26.5 31.5 Minimum Overload dBm 6 6 11 ONU Transmitter Mean Launched Power MIN dBm 6 1 1 Mean Launched Power MAX dBm 1 +4 +4 OLT Receiver Minimum Sensitivity dBm 27 27 32 Minimum Overload dBm 6 6 11 2.5) Clause IV.2.5 Mod
40、ify Table IV.1/G.983.3 as follows: Table IV.1/G.983.3 Values for ONU transmitter equipment reflectance Min ORL Class Optical parameters Required characteristics of ODN Aa)Ba)Ca)Da)Ea)Fa)Option WDM isolation for ONU receiver 6.5 1 WDM isolation for ONU transmitter A WDM isolation for OLT receiver 5.5
41、 5.5 2, 3 WDM isolation for OLT transmitter NA 1 Equipment reflectance for ONU transmitter 0.5 1.5 1, 2 WDM isolation for ONU receiver 8.5 1, 3 WDM isolation for ONU transmitter 32 dB B WDM isolation for OLT receiver 13.5 13.5 2 WDM isolation for OLT transmitter NA 1 Equipment reflectance for ONU tr
42、ansmitter 0.5 1.5 1, 2 WDM isolation for ONU receiver 13.5 1, 2, 3 WDM isolation for ONU transmitter C WDM isolation for OLT receiver 16.5 16.5 1, 2 WDM isolation for OLT transmitter NA 1 Equipment reflectance for ONU transmitter 0.5 1.5 1, 2 ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) 5 Table IV.1/G.
43、983.3 Values for ONU transmitter equipment reflectance Min ORL Class Optical parameters Required characteristics of ODN Aa)Ba)Ca)Da)Ea)Fa)Option WDM isolation for ONU receiver 18.5 1 WDM isolation for ONU transmitter A WDM isolation for OLT receiver 17.5 17.5 2, 3 WDM isolation for OLT transmitter 3
44、.3 1 Equipment reflectance for ONU transmitter 12.5 13.5 1, 2 WDM isolation for ONU receiver 20.5 1, 3 WDM isolation for ONU transmitter 20 dB B WDM isolation for OLT receiver 25.5 25.5 2 WDM isolation for OLT transmitter 3.3 1 Equipment reflectance for ONU transmitter 12.5 13.5 1, 2 WDM isolation f
45、or ONU receiver 25.5 1, 2, 3 WDM isolation for ONU transmitter C WDM isolation for OLT receiver 28.5 28.5 1, 2 WDM isolation for OLT transmitter 3.3 1 Equipment reflectance for ONU transmitter 12.5 13.5 1, 2 a)A, B, C, D, E and F represent Equation A, Equation B, Equation C, Equation D, Equation E a
46、nd Equation F, respectively. 2.6) Clause IV.3.1 Add the following sentence at the end of the clause: IWF1is defined by the worst value of options described in 8.3.1. 2.7) Subclause IV.3.1.1 Modify Table IV.2/G.983.3 as follows: Table IV.2/G.983.3 ORL versus Isolation at WF1 Example conditions Min OR
47、L of ODN Class PEold(dBm) Iolt_r (dB) Pmin (dBm) Required IWF1(dB) Option A 3.5 28.5 19 1 32 dB B 11.5 31.5 14 1 C 16.5 34.5 12 1, 2, 3 A 15.5 28.5 19 1 20 dB B 23.5 31.5 14 1 C +16 28.5 34.5 12 1, 2, 3 6 ITU-T Rec. G.983.3 (2001)/Amd.1 (06/2002) 2.8) Subclause IV.3.1.2 Modify Table IV.3/G.983.3 as
48、follows: Table IV.3/G.983.3 ORL versus Isolation at WF1 Assumption conditions Min ORL of ODN ODNClass Loss of ODN (dB) No. of E-ONU N PEold (dBm) Iolt_r(dB) Pmin (dBm) Reonu_r(dB) RequiredIWF1 (dB)Option A 5 2 3.5 28.5 24 1 32 dB B 10 8 11.5 31.5 15 1 C 15 32 16.5 34.5 9 1, 2, 3 A 5 2 15.5 28.5 12 1
49、 20 dB B 10 8 23.5 31.5 3 1 C 15 32 +16 28.5 34.5 20 NA 1, 2, 3 2.9) Sublause IV.3.1.3 Modify Table IV.4/G.983.3 as follows: Table IV.4/G.983.3 ORL versus Isolation at WF1 Assumption conditions Min ORL of ODN ODNClass Loss of ODN (dB) No. of E-ONU N PEold (dBm) Iolt_r(dB) Pmin (dBm) IWF1 (dB) Required RWF2_r (dB) Option A 5 2 3.5 28.5 24 20 1, 2, 3 32 dB B 10 8 11.5 31.5 15 20 1, 2, 3 C 15 32 16.5 34
