Itu telecommunication Standardization Sector


ITU-T X.85/Y.1321 (03/2001) – Prepublished version



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ITU-T X.85/Y.1321 (03/2001) – Prepublished version 
6



The protocol framework of IP over SDH using LAPS 
IP over SDH using LAPS is a type of data communication architecture of combination Internet protocol or 
other protocols with SDH network. The physical, link and network layer or other protocols are specified as 
SDH, LAPS and IPv4/IPv6 or PPP etc respectively as the layer/protocol stack for IP over STM-N shown in 
Figure 2 and the layer/protocol stack for IP over sSTM-n in Figure 3. The Figure 4 and Figure 5 illustrate 
protocol configuration and network examples respectively. 
 
 
Low Order VC
}
}
Electrical/Optical Section 
Regenerator Section
G.703/G.957 
Multiplex Section 
High Order VC 
G.707
LAPS 
IP 
Internet Protocols 
TCP/UDP
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FIGURE 2/X.85/Y.1321
Layer/Protocol Stack for IP over STM-N using LAPS 
ITU-T X.85/Y.1321 (03/2001) – Prepublished version 
7


 
 
}
}
Electrical/Optical/Radio Section 
Regenerator Section
G.708
Multiplex Section 
G.707
VC11, VC12, VC2
LAPS 
IP 
Internet Protocols 
TCP/UDP 
 
 
FIGURE 3/X.85/Y.1321  
Layer/Protocol Stack for IP over sSTM using LAPS 
IPv4/IPv6 
IPv4/IPv6 
IPv4/IPv6
IPv4/IPv6
TCP/UDP
TCP/UDP 
TCP/UDP
TCP/UDP 
“IP over SDH using LAPS” protocol
LAPS
SDH
“IP over SDH using LAPS” Network
LAN
LAN
SDH
SDH 
MAC 
LLC 
LAPS 
MAC
LLC
LAPS
MAC 
LLC 
MAC 
LLC 
IPv4/IPv6 
TCP/UDP 
FIGURE 4/X.85/Y.1321 

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