Distributed Access Architectures
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1 Distributed Access Architectures Authors: Hesham ElBakoury Version: 1.0 HUAWEI TECHNOLOGIES CO., LTD.
2 Objectives Present current Cablelabs Distributed Access Architectures. Discuss if/how IEEE should support these architectures. HUAWEI TECHNOLOGIES CO., LTD. Page 2
3 Agenda Cablelabs Distributed Access Architectures Remote MAC & PHY (R-MACPHY) Functional Modules of Distributed CMTS Architecture R-MACPHY System Architecture R-MACPHY Management Architecture Remote PHY (R-PHY) L2TPv3 Pseudo-wires R-PHY System Architecture Example of R-PHY L2TPv3 Topologies R-PHY Tunneling Protocols (use L2TPv3 RFC3931). DEPI (Downstream External PHY Interface) UPEI (Upstream External PHY Interface) HUAWEI TECHNOLOGIES CO., LTD. Page 3
4 Distributed Access Architectures HUAWEI TECHNOLOGIES CO., LTD. Page 4
5 1 R-MACPHY HUAWEI TECHNOLOGIES CO., LTD. Page 5
6 Functional Modules of the Distributed CMTS Architecture System control module: This logical module is responsible for Configuration and management of the RFI module and the classification and forwarding module. For example, during CM registration, the system control module parses service flows and classification information reported by the CM and configures the classification and forwarding module accordingly. In addition, the system control module works with the NMS and the configuration system for service configuration and management. HUAWEI TECHNOLOGIES CO., LTD. Page 6
7 R-MACPHY Architecture Configuration system System Control Module R-MACPHY Device (CMC) Classification and forwarding module RFI module R-MACPHY Terminals CM CM NMS R-MACPHY Controller Device NSI Data link-layer MAC sub-module Physical-layer PHY sub-module RFI CM... R-MACPHY Controller manages the configuration of the of the R-MACPHY device. The Controller can be either a separate device or a component embedded in an aggregation and switching device, such as a router, a switch, or an OLT HUAWEI TECHNOLOGIES CO., LTD. Page 7
8 R-MACPHY Management Using the Controller R-MACPHY Controller OSS/NMS Multiple management protocols CMC #1 CMC #2 CMC #3 CMC #n Digital Optical Packet Network Netconf/SNMP One management IP address DOCSIS MAC&PHY EQAM module R-OOB OLT/Router is managed using existing management systems. CM is Managed using existing DOICSIS provisioning and NMS systems. R-MACPHY devices and their CM interfaces are managed like slots in CMTS Chassis. No interest within China MSO for interoperability between Controller and R-MACPHY (CMC). Therefore, there is no interest to update CDMM to reflect new requirements. As a result vendors such as Huawei implement their own L2 protocol. Huawei proposes Netconf/SNMP as the management protocol between the controller and R-MACPHY node. OLT/ Switch/ Router P2P/P2MP Uplink technology L2 protocols PNM Uplink module PNM is used for MER Reporting, Symbol Capture, FEC Error Reporting PHY Stats Reporting HUAWEI TECHNOLOGIES CO., LTD. Page 8
9 2 R-PHY HUAWEI TECHNOLOGIES CO., LTD. Page 9
![L2TPv3 Tunnels and Pseudo-wires The base protocol that is used for the DEPI is the Layer 2 Tunneling Protocol Version 3, or L2TPv3 for short [RFC3931].](/docs-images/74/69907285/images/10-1.jpg "L2TPv3 is an IETF protocol that is a generic protocol for creating a pseudowire (PW) PW is defined in RFC 3955 (Pseudo-wire Emulation Edge to Edge Architecture PWE3) as an Emulation of Point to point")
10 L2TPv3 Tunnels and Pseudo-wires The base protocol that is used for the DEPI is the Layer 2 Tunneling Protocol Version 3, or L2TPv3 for short [RFC3931]. L2TPv3 is an IETF protocol that is a generic protocol for creating a pseudowire (PW) PW is defined in RFC 3955 (Pseudo-wire Emulation Edge to Edge Architecture PWE3) as an Emulation of Point to point connection over a packet switching network (PSN). L2TPv3 tunnel can carry more than one session (PW). There is an optional L2-Specific Sublayer is an intermediary layer between the L2TP session header and the start of the tunneled frame. HUAWEI TECHNOLOGIES CO., LTD. Page 10
11 R-PHY System Architecture HUAWEI TECHNOLOGIES CO., LTD. Page 11
12 R-PHY L2TPv3 Topology Regional Area Network CCAP Core Converged Interconnect Network Remote PHY CM Home Network L2 or L3 LAC L2 or L3 LAC STB PseudoWires DOCSIS & Video Service HUAWEI TECHNOLOGIES CO., LTD. Page 12
13 R-PHY L2TPv3 Topology Multiple Tunnels HUAWEI TECHNOLOGIES CO., LTD. Page 13
14 Remote PHY Pseudo-wires HUAWEI TECHNOLOGIES CO., LTD. Page 14
15 Downstream External PHY Interface (DEPI) Data plane protocol for DS direction Based on L2TPv3 Support IP encapsulation HUAWEI TECHNOLOGIES CO., LTD. Page 15
16 Downstream External PHY Interface (DEPI) Based on L2TPv3 with IP Encapsulation Only Session ID as L2TPv3 Data Header. Cookies are not used. Supports both DOCSIS Packet Streaming Protocols (PSP) and DOCSIS MPEG Transport (D-MPT) HUAWEI TECHNOLOGIES CO., LTD. Page 16
17 Upstream External PHY Interface (UEPI) Only session ID is used. No Cookies Based on L2TPv3 with IP encapsulation Supports PSP. HUAWEI TECHNOLOGIES CO., LTD. Page 17
18 THANK YOU HUAWEI TECHNOLOGIES CO., LTD. Page 18
19 L2TPv3 UDP encapsulation (Not Used in R-PHY) Protocol ID is 17 (UDP) Use 8 bytes L2TPv3 Data Header - 4B Version Header - 4B Session ID HUAWEI TECHNOLOGIES CO., LTD. Page 19
20 UMT Discovery Protocol EPoC Use Case HUAWEI TECHNOLOGIES CO., LTD. Page 20
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