UNI and NNI Highlighted

Hello, everybody!

What are the two most important steps for configuring services on the transmission network? The answer is to configure ports and create trails. Today, let's talk about configuring ports in the transmission network.

There are two types of common ports: UNI and NNI.

What are the UNI and NNI

UNI and NNI are related to network interworking and overlay.

The following figure shows an example in which the transmission network carries common Ethernet services:

1. UNI(User-Network Interface)

The interface between end-user devices and network devices, may also be an interface between one network layer device and another network layer device.

2. NNI(Network-Network Interface)

NNIs are mainly used for interfaces between devices of the same model or between devices of different models at the same network layer. Of course, they can be devices from the same manufacturer or devices from different manufacturers.

Service Interconnection

1. For the UNI

You need to ensure that the parameters are consistent when configuring the services.

Take several common Ethernet parameters as an example:

2. For the NNI

In the transmission network, the port refers to the interface of the line board. Pay attention to the following parameters:

3. Additional knowledge

a. LCAS

Enabled, Disabled

Default value: Disabled

The Enabling LCAS parameter can increase or decrease the SDH network capacity without affecting the service. The capacity is automatically decreased if a member fails, and is automatically increased if the member recovers.

Both ends of the link must be the same. Otherwise, the services are not available.

b. Port Mapping (WDM Interface)

Bit Transparent Mapping

MAC Transparent Mapping

Port Mapping refers to the mapping mode of port service.

Both ends of the link must be the same. Otherwise, the services are not available.

Set the parameter to Standard Mode when the value of this parameter is MAC Transparent Mapping (10.7 G), or Bit Transparent Mapping (10.7 G).

Set the Line Rate parameter to Speedup Mode when the value of this parameter is Bit Transparent Mapping (11.1 G).

The features of the UNI and NNI

1. For the UNI

1. It has standard client-side interfaces and mature interworking technologies.

2. It can convert and combine different service protocols.

2. For the NNI

1. It supports end-to-end services and facilitates management and maintenance.

2. Engineers can quickly provision services and locate faults.

3. It supports SDN features such as BOD and delay measurement.

4. It supports a variety of redundancy protections

For the UNI and NNI of packet services on the transmission network, click: 

Transmission network UNI AND NNI

Thank you!