CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
65
3.3 POS FUNCTIONS
The
µ
PD98413 can map POS packets into a SONET/SDH payload. POS packet processing is performed
according to HDLC frame processing. The following is an overview of POS packet processing.
On the sending end, the
µ
PD98413 performs HDLC processing on the packet data entered from the POS interface
and maps it as POS packets into a SONET payload, inserting a flag sequence (7Eh) between packets.
On the receiving end, the
µ
PD98413 extracts POS packets from the SONET frame payload entered from the line
interface, based on the flag sequence (7Eh). It then performs HDLC processing on the POS packets and sends them
to the POS interface.
The mapping of POS packets into a SONET payload and the POS packet format are shown below.
Figure 3-20. Mapping of POS Packets
SOH
7E
7E
7E
7E
7E
7E
7E
POS packet
POS packet
POS packet
7E
7E
7E
7E
7E
7E
7E
7E
POH
Fixed stuff
Payload
Содержание UPD98413
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