1、Union internationale des tlcommunications Place des Nations 1211 GENVE 20 Suisse Switzerland Suiza COVERING NOTE GENERAL SECRETARIAT INTERNATIONAL TELECOMMUNICATION UNION Geneva, 11 August 2005 ITU TELECOMMUNICATION STANDARDIZATION SECTOR Subject: Erratum 1 (08/2005) to ITU-T Recommendation G.998.3
2、01/2005), Multi-pair bonding using time-division inverse multiplexing 1) Modify Table 5/G.998.3 as follows: Table 5/G.998.3 Pair state machine states definition State Definition Transition Down The pair is not transmitting nor receiving 0P1 to “Handshake“ state Handshake The pair is using Handshake
3、 (ITU-T Rec. G.994.1) for discovery and to negotiate and set its operational parameters (e.g., rate, modulation, Power Spectral Density (PSD) mask, the bonding scheme (TDIM, Ethernet in the First Mile (EFM), etc.) 0P2 to “Down“ state 0P3 to “Activation“ state Activation The pair is activating with i
4、ts operational parameters 0P4 to “Down“ state 0P5 to “Synching to group“ state Synching to group The pair is operating, the aggregation layer operates “Sync to group“ procedure (12.3.3) 0P6 to “Down“ state 0P7 to “Synching to group“ state 0P8 to “Synched to group“ stateSynched to group The pair is s
5、ynchronized to the aggregation group, waiting for a management decision to be added to the aggregation group 0P6 to “Down“ state 0P9 to “Adding to group“ state Adding to group The aggregation layer is attempting to add the pair to the aggregation group by using the “Sync change“ procedure (12.3.2) 0
6、P10 to “Lost sync to group“ state 0P11 to “Part of group“ state Part of group The aggregation layer delivers service data through the pair according to the dispatching table 0P10 to “Lost sync to group“ state 0P12 to “Remove from group“ state 2 Table 5/G.998.3 Pair state machine states definition St
7、ate Definition Transition Lost Sync to group The aggregation layer is operating “Fast change“ procedure, after which the pair is removed from the aggregation group (12.3.1) 0P6 to “Down“ state 0P13 to “Synching to group“ state Remove from group The aggregation layer is operating “Sync change“ proced
8、ure, after which the pair is removed from the aggregation group (12.3.2) 0P6 to “Down“ state 0P10 to “Lost sync to group“ state 0P13 to “Synching to group“ state NOTE A pair is considered “Synchronized to group“ when it is in one of the states: “Synched to group“, “Adding to group“, “Part of group“.
9、 2) Modify Table 6/G.998.3 as follows: Table 6/G.998.3 Aggregation group state machine states definition State Definition Transition Down There are no pairs assigned to the aggregation group, or there are pairs assigned and none of them is in one of the states in which it is “Synchronized to group“
10、i.e., “Synched to group“, “Adding to group“, “Part of group“) 0G1 to “Diag“ state Diag One or more of the pairs related to the Aggregation group are in “Synched to group“ state, and none of the pairs is in “Part of group“ state 0G2 to “Down“ state 0G3 to “Init“ state Init Initiating the aggregation
11、 group by using the “Sync change“ procedure with all of the pairs in that are in “Synched to group“ state 0G4 to “Diag“ state 0G5 to “Up“ state Up The aggregation group is working in a steady-state and transferring service data 0G6 to “Pairs change“ state 0G7 to “Fast pairs removal“ state Pairs chan
12、ge Hitless pairs addition or removal to/from the aggregation group by using the “Sync change“ procedure 0G4, 0G5 to “Up“ state 0G7 to “Fast pairs removal“ state 0G8 to “Diag“ state Fast pairs removal Fast removal of pairs upon pairs loss of sync to the aggregation group, by using the “Fast change“ procedure 0G9 to “Up“ state 0G7 to “Fast pairs removal“ state 0G10 to “Down“ state 0G11 to “Diag“ state 3) In clause A.1, correct figure number as follows: Figure A.26/G.998.3 Modified Figure 6 Clock synchronization reference model
