Definition

Connections are used for communication between the U2000 and managed NEs, and between NEs. You can configure services and manage NEs only after creating related connections in the Main Topology.

Benefits

The physical root view intuitively shows service relationships between network-wide NEs in terms of functional services by using NEs, links, and subnets.

Function Description

U2000 can manage connections, including links and fiber/cables in a centralized manner.

l   Link

A link is used to connect signaling points (SPs) and signaling transfer points (STPs) and transmit signaling messages.

Type	Description
IP Link	An IP link is the Layer 3 link between equipment. The side-by-side link can be displayed in the physical root view. side-by-side link: The IP addresses of the interfaces at both ends of the link are a pair of IP addresses with 30-bit subnet mask.
L2 Link	A Layer-2 link is the Layer-2 link between equipment in the physical root view. The U2000 supports the creation of the Layer-2 links, such as the LLDP links, RPR links and cluster links, and supports the display of the links as the Layer-2 links that support the IPv6 protocol or IPv4 and IPv6 protocol stacks in the physical root view. l  LLDP link: It refers to the Link Layer Discovery Protocol (LLDP) link. The LLDP is a Layer 2 protocol defined in the IEEE 802.1ab. When the LLDP protocol runs on the NEs, the U2000 can obtain the Layer 2 information about all the NEs to which the U2000 is connected and the details about the network topology. This expands the scope of network management. LLDP also helps find unreasonable configurations on the network and reports the configurations to the U2000. This helps to remove the errors in configurations timely. l  RPR link: It refers to the Resilient Packet Ring (RPR) link. The RPR protocol is a new MAC layer protocol defined by IEEE 802.17. It is defined with the purpose of optimizing the transmission of data packages and establishing an Ethernet MAN standard of sharing bandwidth fairly over transmission media. Based on the high bandwidth usage, multi-server access, high bandwidth of optical network, and powerful self-healing capability, the RPR technology has the following features: Two-ring structure Space multiplexing mechanism Flexible service bandwidth granularity Dynamic bandwidth sharing and allocation Statistic multiplexing Service level Automatic recognition of the structure of network topology Protection switching based on the source route l  Cluster link: It refers to links between member NEs in a cluster. A cluster is a management domain consisting of a group of switches (or switches and CX600 NEs), including a command switch and multiple member switches. It manages all the switches in the cluster, through a public IP address.
Extended ECC	When there is no optical path between two or more NEs, the Ethernet ports of the NEs can be used to achieve the extended ECC communication. By default, the NEs use the auto-extended ECC communication. If the amount of Huawei equipment that uses the extended ECC communication exceeds four, the manually extended ECC communication must be used instead.
Virtual Link	A virtual link is used to identify the logical connection relationship between two managed objects. Hence, a virtual link is also referred to as a virtual connection.

 

l   Fiber/Cable

Fiber & Cable refers to the physical entities that connect NEs, carry transmission objects (user information and network management information) and perform transmission function in the network. The optical fiber transmits optical signal, while the cable transmits electrical signal. The fiber/cable between NEs represents the optical fiber connection or cable connection between NEs.

Type	Description
Serial Port Line	A serial port line is used to connect the ports that are used for serial communication. The ports can transmit and receive the communication data.
Cable	A cable is used to connect communication interfaces of different NE and to provide an extra transmission channel at the physical layer for the management information.
Fiber	A fiber is used to connect the optical interfaces between different NE and to provide a transmission channel at the physical layer for service signals. According to the physical feature of a fiber, the U2000 classifies the fiber into seven types, which are G.652, G.653, G.654, G.655-LEAF, G.655-TWC, G.655-TWRS, G.655-LS fibers. Fiber levels consist of WDM (for long fibers) and WDM CORD (for short fibers). Long fibers usually have custom information. Users can easily distinguish long fibers from short fibers when creating and managing these fibers.
Microwave Back To Back	When an RTN station needs to converge services, multiple RTN NE needs to be connected through fibers or 2 Mbit/s or 155 Mbit/s cables. In this manner, low-capacity services are converged to the high-capacity NE.
Radio Link	A radio link uses the radio to connect different outdoor units of radio NE.
Virtual Fiber	Virtual fiber is a logical concept. It may contain several physical fibers, radio links, or even one or more complete networks.
Ethernet Line	The Ethernet line that the U2000 can manage is used to connect the communication interface of the gateway NE and the U2000 server.