Huawei PTN 6900
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1.1 Product positioning
PTN 6900 packet transport platform is a new generation of metro optical transport equipment for packet transmission in Huawei, which is mainly located in the core layer and convergence layer of the metro transport network to form the bearer network of mobile services and key customer private line services.
Brief introduction of equipment
A variety of emerging data service applications have an increasing demand for bandwidth. at the same time, it has put forward higher and higher requirements for the flexibility of bandwidth scheduling. As a circuit-switched network, the traditional SDH-based multi-service transport network is difficult to adapt to the burst and flexibility of data services. However, the traditional non-connection-oriented IP network is not suitable as a carrier-class bearer network because it is difficult to strictly guarantee the quality and performance of important services.
PTN 6900 uses PWE3 (Pseudo Wire Emulation Edge-to-Edge) technology to realize connection-oriented service bearer, adopts MPLS (Multiprotocol Label Switching) forwarding technology optimized for telecom carrier network, coupled with perfect OAM (Operation, Administration and Maintenance) and protection switching mechanism, integrates the advantages of packet transport network and SDH transport network, and realizes telecom-level services.
1.2 Product Features
PTN 6900 packet transport platform supports a variety of service types and provides rich functional features to ensure the quality and efficiency of service transmission.
1.2.1 Rich types of business
PTN 6900 packet transport platform supports CES service, Ethernet service, L3VPN service, and multicast service.
1.2.2 strong processing power
The service processing capability of the PTN 6900 packet transport platform includes switching capacity and service access capability.
1.2.3 Rich interface types
The external interface of the PTN 6900 packet transport platform includes service interface and management and auxiliary interface.
1.2.4 hierarchical OAM
PTN 6900 packet transport platform has layered OAM function to realize fast fault detection and location at all levels.
1.2.5 perfect protection
The PTN 6900 packet transport platform provides carrier-level device-level protection and network-level protection.
PTN 6900 packet transport platform provides rich device-level protection.
PTN 6900 packet transport platform provides rich network-level protection.
1.2.6 perfect QoS mechanism
PTN 6900 packet transport platform provides hierarchical end-to-end QoS (Quality of Service) management and can provide high-quality differentiated delivery services by service.
The PTN 6900 packet transport platform has a complete QoS scheduling mechanism:
Support the DiffServ mode based on flow classification, and fully implement the PHB defined in the standard (Per-hop Behavior), enables network operators to provide users with different quality of service guarantees, and realize an integrated network that carries data, voice and video services at the same time.
Provide QoS for end-to-end services.
The device supports HQoS (Hierarchical QoS) mechanism on the access side, which can respectively control the total bandwidth of a single service type, a single service access point, multiple service access points, a single service or multiple services.
The device supports the TE (Traffic Engineering) mechanism on the network side to balance the network traffic and ensure the quality of service.
The perfect QoS mechanism can fully guarantee the delay, jitter and bandwidth requirements of different services, and ensure the development of carrier-level services.
1.2.7 precise synchronization
The PTN 6900 packet transport platform supports the physical layer clock synchronization mechanism, provides an external clock input / output interface and the device’s internal system clock, and supports IEEE 1588 V2 clock / time synchronization and 1588 ACR clock synchronization.
Physical layer clock
The clock synchronization mechanism in the physical layer is a technology that extracts clock information from the signals of the physical channel of the transmission link to complete frequency synchronization.
The PTN 6900 packet transport platform extracts clock information from the following transmission links:
Support for clock extraction from the channelized STM-1 interface.
Support for clock extraction from synchronous Ethernet interfaces.
Support for clock extraction from E1 interface.
It is supported to get the clock from the external clock interface of 2Mbit/s or 2MHz.
Synchronous Ethernet is a kind of Ethernet physical layer clock synchronization technology, which is similar to SDH clock. The clock is extracted directly from the serial code stream on the Ethernet line, and the clock is used to send data to realize the transmission of the clock.
IEEE 1588 V2
IEEE 1588 V2 is a time synchronization protocol that can achieve nanosecond accuracy and meet the requirements of 3G base stations. The PTN 6900 packet transport platform supports the following features of IEEE 1588 V2
Support for clock synchronization and time synchronization using IEEE 1588 V2 protocol.
Support BC (Boundary Clock) mode, OC (Ordinary Clock) mode, TC (Transparent Clock) / TC+OC clock mode. TC clock can be divided into E2E (End-to-End) mode and P2P (Peer-to-Peer) mode.
Support BMC clock source selection algorithm.
1588 ACR (Adaptive Clock Recover), means that the Master device supporting IEEE 1588 V2 encapsulates the local system clock information into 1588 V2 (also known as PTP) message and sends it to the peer Slave device through the third party network. The Slave device acquires the timestamp from the 1588 V2 message and recovers the clock to realize the frequency synchronization of the devices at both ends of the PSN network. In this scheme, the intermediate third-party network does not need to support the IEEE 1588 V2 protocol.
The 1588 V2 clock messages supported by PTN 6900 devices are multicast Ethernet messages. The PTN 6900 device on the RNC side adds the timestamp carrying the system information to the 1588 V2 clock message, and multicasts the clock information to the 1588 V2 clock message through a third-party network.
PTN 6900 device on the NodeB side. After receiving the 1588 V2 clock message, the PTN 6900 device acquires the timestamp, recovers the clock through calculation and uses it as the system clock, and transmits the clock to NodeB, so as to achieve frequency synchronization between devices at both ends of the network.
1.2.8 DHCP Relay
The PTN 6900 packet transport platform supports the DHCP Relay function and realizes the automatic acquisition of the IP address by the base station.
After the base station is powered on, the IP address needs to be obtained automatically through DHCP. The PTN 6900 packet transmission platform is located on the transmission line between the base station and the controller and relays the DHCP packets between the base station and the controller. This enables the base station to obtain the IP address.