GPON 状态机培训.pptx

PLOAM message Activation method 12/13/2017 Slide No.01 G.984.3—GPON Transmission Convergence(TC)层规范 GPON TC layer framing Upstream Time-Division Multiple Access mechanism Physical layer OAM messaging channel Principles and signaling mechanism of the Upstream Dynamic Bandwidth Assignment ONU activation method Forward error correction Security Related Protocol PLOAM Message See clause 9/G.984.3 (2008) Activation method See clause 10/G.984.3 (2008) State Diagram of the ONU See Figure 10-1/G.984.3 (2008) Related clause 12/13/2017 Slide No.03 Physical layer OAM：PLOAM PON TC layer management functions: ONU activation OMCC establishment Encryption configuration Key management Alarm signaling PLOAM Message 12/13/2017 Slide No.04 Format: ONU ID: 0-253,255(0xFF)—for broadcast to all ONUs PLOAM Message ONU-ID Designation Comment 0..253 Assignable Assigned by OLT at ONU activation; used to identify the sender of an upstream burst or a PLOAMu, and to address PLOAMd. 254 Reserved Should not be assigned, as it conflicts with the Alloc-ID usage. 255 Broadcast/unassigned Broadcast address in PLOAMd; unassigned ONU in PLOAMu. 12/13/2017 Slide No.05 PLOAM Message Introduction Downstream message definition Upstream message definition PLOAM Message 12/13/2017 Slide No.06 Purpose: allowing an inactive ONU to join or resume operation on the PON activation process: three phases Parameter Learning, Serial Number Acquisition, Ranging Activation mechanism 12/13/2017 Slide No.07 Activation mechanism Seven ONU states: O1 – Initial State O2 – Standby State O3 – Serial Number State O4 – Ranging State O5 – Operation State O6 – POPUP State O7 – Emergency Stop State 12/13/2017 Slide No.08 TO1 Serial Number acquisition and Ranging timer. ONU can sojourn in states O3 and O4 used to abort an unsuccessful activation attempt by limiting the overall time (expiring :O3,O4-O2) The recommended initial value of TO1 is 10 s. TO2 POPUP t