connections, WDM service types, and board models. Understanding the basic concepts helps
you successfully configure services.
General Principles for Configuring Electrical Cross-
Connections
Electrical cross-connections include inter-board cross-connections (namely, cross-connections
between boards) and intra-board cross-connections (namely, cross-connections inside a
board). This topic describes the concepts, port types, configuration principles, and
applications of the two types of electrical cross-connections.
Inter-board Electrical Cross-Connections
This topic describes the concept, port types, configuration principles, and two applications of
inter-board electrical cross-connections. In addition, this topic provides an example of
configuring inter-board electrical cross-connections using the U2000.
Basic Concept
Inter-board electrical cross-connections are configured between boards to groom ODUk and
GE services inside a subrack. They are configured on the U2000.
Specifically, inter-board electrical cross-connections can be configured either between OTN
tributary and line boards (include PID boards) or between line boards (include PID boards).
The line boards include OTN line boards, universal line boards.
Some OTU boards for the OptiX OSN 3800 and OptiX OSN 6800 support inter-board 10GE
and GE cross-connections. For details, see section "Physical and Logical Ports".
Port Type
The source and sink ports must be specified when you configure inter-board cross-
connections. On the U2000, the following ports can be configured as the source or sink ports
of cross-connections:
- ClientLP-n: the logical client-side port of a board in compatible mode, for example, 201(ClientLP1/ClientLP1)-1, where 201(ClientLP1/ClientLP1) indicates the port number and -1 indicates the channel number.
- ODUkLP-n: the logical ODUk port of a board in compatible mode, for example, 61(ODU0LP1/ODU0LP1)-2, where 161(ODU0LP1/ODU0LP1) indicates the port number and -2 indicates the channel number.
- RX/TX-n: the logical client-side port of a board in standard mode, for example, RX2/TX2-2, where RX2/TX2 indicates the port number and -2 indicates the channel number. n(INn/OUTn)-OCH:1-ODUk:m-ODUp:q: the ODUk-level logical port of a board in standard mode, from which you can learn the service mapping path. The service mapping paths are different in the following ODU timeslot configuration modes: Assign consecutive and Assign random.
-- In the Assign consecutive mode, level-by-level service mapping is performed from
lower rates to higher rates, for example, ODU0->ODU1->ODU2. In this example,
the logical port is represented as 1(IN1/OUT1)-OCH:1-ODU2:1-ODU1:2-ODU0:1,
which means the first ODU0 in the second ODU1 of the first ODU2 on optical port
.
– In the Assign random mode, cross-level service mapping is performed from a low
rate to a high rate, for example, ODU0->ODU2. In this example, the logical port is
represented as 1(IN1/OUT1)-OCH:1-ODU2:1-ODU0:1, which means the first
ODU0 in the second ODU2 on optical port 1.
Configuration Principles
The source and sink ports of a cross-connection must have the same ODUk service
granularity and line rate (standard mode/speedup mode ), but they do not require the same
board working mode (standard/compatible) or ODUk timeslot configuration mode (assign
random/assign consecutive). The following figure shows ODU0-level cross-connections. In
the figure, each of the boards can work in either standard or compatible mode.
- As for the same ODUk service granularity, tributary boards (standard/compatible) can interconnect with line boards (standard/compatible), and the cross-connections between the boards are indicated by 1 3 4 2 in the figure.
- As for the same ODUk service granularity and line rate, line boards (standard/compatible) can interconnect with each other, and the cross-connection between the boards is indicated by 5 in the figure.
NOTE
- On the U2000, the subrack layout diagram displays different names of the board in different modes(standard and compatible). For example, the name of the TN52ND2 board in standard mode is displayed as TN52ND2(STND), and the name of the TN52ND2 board in compatible mode is displayed as TN52ND2. For the board names in different modes, see 2.1.2 Standard Mode and Compatible Mode.
- Line Rate is a parameter available only to line boards and can be set using the U2000. For theparameter setting of boards, see the "Parameters Can Be Set and Queried on the NMS" topic for the boards.
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