Outline:
¾Multi-Pvcs
¾ADSL2plus
9SELT(Single Ended Line Testing) 9DELT(Dual Ended Line Testing) 9SRA(Seamless Rate Adaptation) 9Power Management
VPI&&VCI
VP(Virtual Path) and VC(Virtual Channel) are provide in the ATM layer.VP is the collectivity of the VCs,and exchanges the message by the VP.the VP and VC are accordingly identified with VP identifier and VC Identifier.So one virtual channle is decided by the port id、VPI and VCI. The relatioship is as follows.
VPI&&VCI(cont)
Transmission Virtual Path(VCI+VPI)
link(port ID)
Virtual Path(VPI)
Payload
margin rate
VP(Virtual Path) and VC(Virtual Channel)
concept
From a view of  the input and output of the DSLAM:
Logical Port: bridge port
Physical Port: real physical port for DSLAM,namely dsl port
From a view of  the work protocol:
Logical Port:not just  bridge port.Atm port, aal5 port ,eoa port and aggr port are included
Physical Port: real physical port for DSLAM,namely dsl port
Multi-PVC
What is the relationship among DSL port ,the PVC and the bridge port ?
Usually,the relationship is one-to-one mapping between the pvc and bridge port ,but sometimes it is not true. Standard:
RFC1483:EOA
RFC1577:IPOA
RFC2364:PPPOA
Some applications are presented in the following sections.
Application(1)--one-to-one mapping The relationship between the PVC and bridge port is one to
one mapping .
The Maxinum pvc num for each DSL port is 8 : one  PVC applies for management service(CPE management) and the others apply for the data service.
The pkt is encapsulated by AAL5 from the ATM layer from the AAL5 layer ,and by RFC1483 from the
AAL5 layer to the EOA layer.
An example for DSL-0 is shown in the following section.

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。