AGGREGATION NODE DEVICE OF PASSIVE OPTICAL NETWORK AND PASSIVE OPTICAL NETWORK SYSTEM

• US 20100232794A1
• Filed: 05/25/2010
• Published: 09/16/2010
• Est. Priority Date: 12/13/2007
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zheng, Ruobin
• Granted Patent: US 8,285,142 B2
• Time in Patent Office: Days
• US Class Current: 398/68
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 14/0284 WDM mesh architectures
• CPC Class Codes: H04J 14/0286 WDM hierarchical architectures
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062
• CPC Class Codes: H04Q 11/0067 Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• CPC Class Codes: H04Q 11/0071 Provisions for the electrical-optical layer interface

Abstract

An aggregation node device of a passive optical network (PON) is provided which includes an aggregation optical line terminal (OLT) and an aggregation optical network unit (ONU). The aggregation OLT is connected to a user-side ONU. The aggregation OLT aggregates service data transmitted by a user-side ONU and transmits the aggregated service data to the aggregation ONU. The aggregation ONU is adapted to transmit the received aggregated service data to a network-side OLT. A PON system is further provided. The device and system can not only support the conventional time division multiplexing (TDM) services but also support the services based on variable-length packets and the multicast service. Moreover, it is not necessary to build an equipment room and supply power for an intermediate optical distribution network (ODN) which greatly reduces the network construction and operation costs.

Claims

1. An aggregation node device of a passive optical network (PON), comprising:

an aggregation optical line terminal (OLT); and

an aggregation optical network unit (ONU),

wherein the aggregation OLT is connected to a user-side ONU, the aggregation OLT aggregating service data from the user-side ONU and transmitting the aggregated service data to the aggregation ONU, and

wherein the aggregation ONU is adapted to transmit the received aggregated service data to a network-side OLT.

2. The device according to claim 1, wherein the aggregation ONU comprises a data link layer function module and a physical layer function module, the data link layer function module being adapted to perform a PON data link layer function in a PON protocol stack and the physical layer function module being adapted to perform a PON physical media layer function in the PON protocol stack.

3. The device according to claim 2, wherein the data link layer function module is a Gigabit PON (GPON) transmission convergence (TC) layer function module and the physical layer function module is a GPON physical layer function module, the GPON TC layer function module being adapted to perform GPON Encapsulation Method (GEM) encapsulation or decapsulation of Ethernet packets for an ETH over GPON Encapsulation Method (ETH over GEM) mode or to perform GEM encapsulation or decapsulation of Internet Protocol (IP) packets for an IP over GEM mode and the GPON physical layer function module being adapted to perform a PON physical media layer function in the PON protocol stack.

4. The device according to claim 2, wherein the data link layer function module is an Ethernet data link layer function module and the physical layer function module is an Ethernet physical layer function module.

5. The device according to claim 2, wherein the data link layer function module is a wavelength division multiplexing (WDM) PON data link layer function module and the physical layer function module is a WDM PON physical layer function module.

6. The device according to claim 2, further comprising:

a switch functional unit adapted to interconnect the aggregation OLT and the aggregation ONU and to perform packet switching between the aggregation OLT and the aggregation ONU.

7. The device according to claim 1, wherein the aggregation ONU comprises:

a PON physical layer function module adapted to perform a PON physical media layer function in a PON protocol stack.

8. The device according to claim 7, wherein the aggregation ONU further comprises a GPON TC layer function module adapted to perform GEM encapsulation or decapsulation of time division multiplexing (TDM) frames or to perform GEM encapsulation or decapsulation of synchronous digital hierarchy (SDH) frames.

9. The device according to claim 7, wherein the aggregation ONU further comprises an Ethernet PON (EPON) data link layer function module adapted to perform a PON data link layer function in an EPON protocol stack.

10. The device according to claim 7, wherein the aggregation ONU further comprises a WDM PON data link layer function module adapted to perform a PON data link layer function in a WDM PON protocol stack.

11. The device according to claim 7, further comprising:

a mapping functional unit adapted to be connected to the aggregation OLT and the aggregation ONU and to map a time slot or a wavelength between the aggregation OLT and the aggregation ONU.

12. A passive optical network (PON) system, comprising:

a user-side optical network unit (ONU),

an aggregation node device, and

a network-side optical line terminal (OLT),

wherein the user-side ONU is adapted to transmit service data transmitted by a customer premises equipment (CPE) to the aggregation node device, the aggregation node device is adapted to aggregate the service data transmitted by the user-side ONU, and the network-side OLT is adapted to re-aggregate service data from more than one aggregation node device.

13. The system according to claim 12, wherein the aggregation node device comprises an aggregation OLT and an aggregation ONU, the aggregation OLT being connected to the user-side ONU, aggregating the service data transmitted by the user-side ONU, and transmitting the aggregated service data to the aggregation ONU and the aggregation ONU being adapted to transmit the received aggregated service data to the network-side OLT.

14. A method for transmitting data in a passive optical network (PON) system, comprising:

receiving, by an aggregation node device, service data from customer premises equipment (CPE) forwarded by a user-side optical network unit (ONU); and

aggregating, by the aggregation node device, the received service data and transmitting the aggregated service data to a network-side optical line terminal (OLT) for re-aggregation.

15. The data transmission method according to claim 14, wherein the aggregation node device comprises an aggregation OLT and an aggregation ONU and wherein the aggregating, by the aggregation node device, the received service data and transmitting the aggregated service data to the network-side OLT further comprises:

aggregating, by the aggregation OLT, the service data transmitted by the user-side ONU and transmitting the aggregated service data to the aggregation ONU; and

transmitting, by the aggregation ONU, the received aggregated service data to the network-side OLT.