Maxim Integrated DS33Z41 - Manual (Page 55)

DS33Z41 Quad IMUX Ethernet Mapper
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8.18 X.86 Encoding and Decoding
X.86 protocol provides a method for encapsulating Ethernet Frame onto LAPS. LAPS provides a HDLC-type
framing structure for encapsulation of Ethernet frames, but does not inflict dynamic bandwidth expansion as
HDLC does. LAPS encapsulated frames can be used to send data onto a SONET/SDH network. The DS33Z41
expects a byte synchronization signal to provide the byte boundary for the X.86 receiver. This is provided by the
RSYNC pin. The functional timing is shown in
Figure 11-7 . The X.86 transmitter provides a byte boundary
indicator with the signal TSYNC. The functional timing is shown in Figure 11-6 . Note that in some cases,
additional logic may be required to meet RSYNC/TSYNC sychronization timing requirements when operating in
X.86 mode.
Figure 8-14. LAPS Encoding of MAC Frames Concept
IEEE
802.3 MAC Frame
LAPS
Rate Adaption
SDH