The service characteristics of the local transmission network access layer were firstly analyzed. The services of the access layer would be diversified and had higher bandwidth for carrying the services of the LTE backhaul

the OLT uplinks

and the private lines for big customers

the smart city services and so on. Then the features of the access layer OTN technology were briefly described

which were the large-bandwidth transparent transmission capability

multi-service access capability

reliable protection and good operation-and-maintenance. Taking construction of the access layer OTN system in a central area of a certain south city for example

the multi-services carried by it were analyzed. At last

the necessity of constructing the access layer OTN system was detailed illustrated by the capacity challenges for the access layer of local transport network

the infrastructural constraints of constructing pipes and optical cables

the advantages and disadvantages of constructing the access layer OTN system. It suggests that building the access layer OTN system is an ideal choice for bearing the multi-services for the local transport network access layer.