Contents
7 NM Information Interworking 7-1
7.1 Interworking at Physical Layer 7-1
7.1.1 NM Information Transparently Transmitted by a Third-Party Equipment 7-1
7.1.2 The NM Information of the Third-Party Equipment is Transparently Transmitted 7-2
7.2 IP Over DCC 7-4
7.3 OSI over DCC(TP4) 7-5
7.3.1 Background 7-5
7.3.2 OSI Protocol Framework 7-6
7.3.3 Application and Features 7-6
7.3.4 Networking and Service Capability 7-6
7.3.5 Advantages and Disadvantages 7-7
Figures
Figure 7-1 NM information is transparently transmitted by third-party equipment 7-1
Figure 7-2 The NM information of the third-party equipment is transparently transmitted 7-2
Figure 7-3 The IP protocol stack of the OptiX OSN product 7-4
Figure 7-4 The NM information is transparently transmitted by the third-party equipment 7-4
Figure 7-5 The NM information of the third-party equipment is transparently transmitted 7-5
Figure 7-6 Framework of OSI protocol stack 7-6
Figure 7-7 Direct management on OptiX through OSI DCN 7-7
Figure 7-8 Manage OptiX equipment through OSI network of other vendors’ equipment 7-7
Figure 7-9 Manage other vendors’ equipment through OptiX network 7-7
Tables
Table 7-1 Features of the transparent transmission of NM information by the third-party equipment 7-2
Table 7-2 Features of the transparent transmission of NM information by the third-party equipment 7-3
Table 7-3 Features of the NM information interworking in IP over DCC mode 7-5
This chapter introduces the NM information interworking at the physical layer and the network layer.
The data communication channel (DCC) consists of two parts. One is on the D1–D3 bytes of regenerator section, providing DCC with the rate of 192 kbit/s. The other is on the D4–D12 bytes of multiplex section, providing DCC with the rate of 576 kbit/s. Currently, only the D1–D3 bytes are used by the transmission equipment, whereas the D4–D12 bytes are reserved for occasions requiring higher management capability.
When there is a third-party equipment between the OptiX OSN 3500 and the OptiX iManager T2000, the bytes D4–D12 will be used by the third-party equipment to transmit the NM information, as shown in Figure 7-1.
Figure 7-1 NM information is transparently transmitted by third-party equipment
The following three cases may exist.
n The third-party equipment uses the D1–D3 bytes to bear its NM information. At the network interconnecting point, the OptiX OSN 3500 may use the D4–D12 or D7–D9 bytes to carry its NM information, which may be reverted into the D1–D3 bytes on the other side of the network edge.
n If the third-party equipment uses the D4–D12 bytes for its NM information, the OptiX OSN 3500 at the network interconnecting point may directly use its D1–D3 bytes to transmit the NM information.
n For orderwire bytes E1 and E2, the OptiX OSN 3500 at the network interconnecting point can use the D11 byte to carry its E1 byte, and use D12 to carry the E2 byte. On the other side of the network edge, the information will be reverted into the E1 and E2 bytes, thus fulfilling transparent transmission of orderwire.
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