A physical OLT can be divided into a maximum of 4 virtual systems (VSs), including the management VS and the service VS. The management VS is the default VS in the system when you log in to the physical OLT. Generally, specific services are not deployed in this VS. The service VS is created through the management VS. It is usually named VS1, VS2, and VS3.<?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" />
