Speaker: Shieh-Chieh Chien Advisor: Dr. Ho-Ting Wu 2014/05/26 1

 PON  EPON  TDM & TDMA  MPCP  IPACT  IPACT with downstream  IPACT downstream collision  Power saving design  Active to doze  Active to sleep  Two service level  Early wake up  Mode transition  Our proposal  Parameter  Sleep time setting  How long can ONU keep in power saving mode?  Reference 2

 Passive Optical Network (PON) ： ▪ A PON is composed of one OLT and multiple ONUs or ONTs.  Optical Line Terminal (OLT) ： ▪ The OLT resides in the local exchange (central office; CO)  Optical Network Unit (ONU) ： ▪ The ONU is located at user premises (FTTC, FTTH,FTTB..)  Data Link ： SONET 、 ATM 、 Ethernet  Media-access ： WDM 、 TDM 、 CDM 3

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 Ethernet Passive Optical Network (EPON)  A PON that carries Ethernet traffic  OLT downstream direction (OLT -> ONUs) ： ▪ TDM ▪ Point-to-multipoint ▪ Ethernet is broadcasting by nature ▪ ONU extract downstream packets based on MAC address  ONUs upstream direction (ONUs -> OLT) ： ▪ TDMA ▪ Multipoint-to-point ▪ Use separate TDM channel 6

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 The MPCP is only a message-exchange protocol  Five MAC Control messages ：  REGISTER_REQ 、 REGISTER 、 REGISTER_ACK ▪ Used for ONU auto-discovery, registration and ranging  GATE 、 REPORT ▪ Used for assigning and requesting bandwidth 8

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 Active mode (TRx-on)  SIEPON (IEEE P1904.1) [2]  Tx sleep mode  TRx sleep mode  ITU-T G-series Recommendations – Supplement 45 [3]  Doze ( Tx-off, Rx-on)  Sleep(TRx-off) 18

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 The priority value is using 3-bit field stored in Ethernet frame header defined by IEEE P802.1p  High priority for delay sensitive and bandwidth guarantee traffic ▪ Ex: network control, video traffic  Low priority is typically best-effort traffic 23

 While in power saving mode ONU can do early wake up to transmit high priority data.  Sleep to Active aggressive 2ms (0.125~5.125 ms)[5]  Doze to Active (0.125 ms)[5] 24

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 16 ONUs  Cycle time 2 ms  Guard time = 5 μs  MTW = Bytes  (2ms - 16* Guard time )/16 ONUs/8bit *10 9  IPACT limited service  Optical distribution network(ODN) = 10 Km  Packet size = 64~1518 Bytes  Timer Y=20ms  Tolerate = low priority delay bound  ONU, OLT Queue size = 8 Mbytes  1 Gbps/ 16 = 62.5Mbps  62.5Mb/8 = Mbytes ( low priority won’t drop ) 29

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 To keep a watchdog timer in the OLT from expiring and deregistering the ONU, ONUs should sent MPCP REPORT message to the OLT periodically. (IEEE 802.3ah and IEEE 802.3av)  The maximum duration of the sleep period shall be selected to be less than one second to be avoid automatic deregistration for the ONU under the operation of MPCP timeout mechanism. (IEEE Std ) 31

 [1] G. Kramer, B. Mukherjee, and G. Pesavento, “ Ethernet PON(Epon): Design and Analysis of an Optical Access Network, ” pp. 1-25, Aug  [2]G. Kramer, B. Mukherjee, and G. Pesavento, “ IPACT: A Dynamic Protocol for an Ethernet PON (EPON), ”IEEE Commun. Mag., vol. 40, no. 2, pp , Feb  [3] IEEE Std : “ IEEE Standard for Service Interoperability in Ethernet Passive Optical Networks (SIEPON), ”2013.  [4] ITU-T, “G.Sup 45 : GPON power conservation,”2009.  [5] Ahmad R. Dhaini,“Toward Green Next-Generation Passive Optical Networks,”IEEE Commun. Mag., pp , Nov  [6] J. Mandin, “ EPON Powersaving via Sleep Mode,” IEEE 802.3av Meeting,  [7] G. Kramer, “ On Configuring Logical Links in EPON,” Teknovus, Inc. pp

 Thanks for your attention. 33