Glossary I

Idle resource optical NE

When the is started successfully, an NE icon called "Idle ONE" will be displayed on the topological view. In this NE, idle DWDM shelves and boards are reserved, which can be distributed to other ONEs. Double-click the NE icon to view all the currently idle DWDM shelves or boards in the network.

Incremental filtering trail

In this search mode, the NM first reserves the trail data of the current client and then re-searches the service configuration data of respective NEs on the NM side according to the newly given search condition to form the new trail data and combine it with the original trail data to get the result.

Incremental mode

The incremental mode means to compare the trail information of the NM side with the service configuration information of respective NEs at the NM side. If inconsistent, the trail information will be fed back into the list as an "Inconsistent Trail". When the user has deleted the inconsistent trail information, the system will re-search for the service configuration information of the NM side which has not formed the trail information.

Incremental search

The increment search mode means to compare the trail information in network layer on the NM side with the service configuration information of respective NEs on the NM side. If they are inconsistent, the trail information will be fed back into the list as an "Inconsistent Trail". When the user has deleted the inconsistent trail information, the system will re-search for the service configuration information that has not formed the trail in the NE layer on the NM side.

Inter-board wavelength path protection

The optical wavelength inter-board channel protection is mainly implemented by the SCC judging the alarm report in the line of the wavelength conversion board to turn off the laser in the tributary of the board. The dual-fed is implemented by adding a passive optical splitter to the tributary. The signal selection is implemented by the SCC turning off the laser in the tributary with poorer signal quality according to the signal quality of the lines of two wavelength conversion boards, and letting the channel of light with higher quality pass through the coupler. The coupler is also a passive device and only one channel of light can pass through it. If there are two channels of light passing through the coupler, they will interfere each other that would cause bit error to the service. Therefore, it is necessary to ensure that only the channel of light with higher quality pass through the coupler at a destined time.

Intermediate office

It refers to the equipment used for optical fiber management and dispatch in the metropolitan area. It has multiple pairs of interfaces for the optical fiber connection. Every two interfaces in a pair are connected with each other to form a longer physical optical fiber path. The physical optical fiber path connecting the transmission equipment can comprise two or more sections of optical fiber cascaded via the intermediate office. There is an intermediate office information list for some fiber & cable connections, which shows the section information about the fiber & cable.

Intra-Board optical wavelength path protection

The intra-board optical wavelength path protection is mainly implemented by the wavelength conversion board with dual-fed and signal selection function. The dual-fed is implemented by the optical divider inside the board, while the signal selection is implemented by the board turning off the laser of one of the receiving optical interfaces. Therefore, this protection mode is also called optical wavelength intra-board channel protection. The switching in this protection mode can be completed within a short time, but the services must be interrupted during the maintenance of the damaged boards or devices. Therefore this protection mode will have a relatively lower reliability.

IP address

In the TCP/IP protocol, it is used to uniquely identify the address of the communication port, which consists of four bytes in decimal digits, for example, 129. 9.161.55. According to the first byte of the IP, an IP address can be classified into five types:

IP address of gateway

The IP address of a gateway NE that provides the gateway routing service.

Isolated node

An isolated node does not refer to an isolated NE, instead, it refers to a type of special logical system which does not belong to any protection sub-network or SDH NNI. It is the node that has been configured on the NE side but cannot form (or has not formed) a corresponding protection sub-network with other nodes. This node may be either an NE or a logical system on the NE. An isolated node may be formed when:(1) There is something wrong with the configuration information of the NE side; (2) The fiber/cable connected to this node has not been created on the . The sub-network where this node resides is of unprotected type.

Isolated node

An isolated node does not refer to an isolated NE, instead, it refers to a type of special logical system which does not belong to any protection sub-network or SDH NNI. It is the node that has been configured on the NE side but cannot form (or has not formed) a corresponding protection sub-network with other nodes. This node may be either an NE or a logical system on the NE. An isolated node may be formed when:(1) There is something wrong with the configuration information of the NE side; (2) The fiber/cable connected to this node has not been created on the . The sub-network of this node is of non-protection.