Networking Application. Engineering Requirement. Orderwire and ECC Requirements. Engineering Planning. Networking Diagram, страница 3

At the central node A, the quality of BITS clock meets the requirement of G.811. The whole network is required to trace the clock, with SSM and clock ID enabled to avoid clock mutual tracing.

If the BITS clock fails, the network should trace the internal clock of node A.

3.1.5  Orderwire and ECC Requirements

The orderwire phone should be set at each node to facilitate the maintenance. No route needs to be set manually in the network, and there is no special requirement for ECC.

3.2  Engineering Planning

Based on the above-mentioned engineering requirement, the engineering design department makes plan for the project and outputs the following information:

n  Networking diagram

n  Protection configuration

n  Hardware configuration

n  Fiber connection

n  Network clock tracing diagram

n  Network management and ID allocation diagram

n  Network orderwire diagram

3.2.1  Networking Diagram

1.  Networking Planning

Figure 3-2 shows a metropolitan backbone network constructed by the OptiX OSN 9500, as well as the interconnection planning with upper backbone network and with the lower access network. There is a two-fiber bidirectional MSP ring from NE1 to NE4, which can meet the requirements of current service and future expansion. Table 3-5 shows the place code and the corresponding NE. The fiber used in the line is G.652, with the attenuation coefficient being 0.275 dB/km, including the attenuation of each splicing point and fiber jumper.

Table 3-5 Correspondence of place code and NE

Place code	NE	Place code	NE
A	NE1	A-2	NE11
B	NE2	B-1	NE20
C	NE3	D-1	NE40
D	NE4	D-2	NE41
E	NE5	E-1	NE50
A-1	NE10	E-2	NE51

Figure 3-2 The OptiX OSN 9500 networking diagram

2.  Ethernet Service Networking Planning

The OptiX OSN 9500 provides the GE06 board to support GE optical interface access.

Figure 3-3 shows the networking for transparent transmission of Ethernet service. The OptiX OSN 9500 provides transparent transmission of Ethernet service from point to point. The Ethernet services between NE1 and other NEs are transmitted to the destination through the separate VCTRUNCK, which ensures the security and reliability of data transmission.

Note: The number near VCTRUNCK is the number corresponding of different Ethernet services listed in Table 3-3

Figure 3-3 Ethernet transparent transmission service

3.2.2  Protection Configuration

1.  Equipment Protection Configuration

Table 3-6 shows the equipment protection configuration of the network.

Table 3-6 Equipment protection configuration

Protection type	NE to be protected	Hardware requirement
Power supply unit backup	NE1, NE2, NE3, NE4, NE5	The power supply unit adopts 1+1 hot backup. The power supply slots are PIU.
Cross-connect board backup	NE1, NE2, NE3, NE4, NE5	The cross-connect board adopts 1+1 hot backup in slot XCH.
Clock board backup	NE1, NE2, NE3, NE4, NE5	The clock board adopts 1+1 hot backup. The two slots are STG.
Working power backup	NE1, NE2, NE3, NE4, NE5	Insert JPBU in slot PBU to realize 1:3 power protection.

2.  Network Protection Configuration

In the example, the STM-64 ring is configured as two-fiber bidirectional MSP ring compliant with ITU-T G.841 recommendations, and the switching time is less than 50 ms. The STM-16 chain is configured as 1+1 linear MSP, and the switching time is less than 50 ms required by ITU-T G.841.