VPWS with Smart SFP
The TDM circuits flows through the VPWS with smart SFP packetizing the incoming TDM frames. Packetizing happens with the following process:
All frames from the TDM lines are channelized until E1 and then packetized.
The packetization is done by adding:
RTP header – For DCR clocking support
VLAN header – For uniquely identifying the E1 channel
ENET header – The Ethernet DMAC and SMAC
CW – control word for communicating the sequence number, faults in the access side
Payload – the incoming TDM frames are chopped into 193Bytes frames and added into the payload.
The packets mentioned previously sent to the NPU.
The E1 channel is mapped into a sub-interface (with specific VLAN).
The packets received into the NPU with that specific VLAN number go through the VPWS logic and gets pseudowired (xconnected) with the configuration in a specific sub-interface.
QOS configured under the sub-interface gets applied to this PW.