DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 64

• Manufacturer Part Number: DS33R41
• Description: Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
• Manufacturer: Maxim Integrated Products

DS33R41 Inverse-Multiplexing Ethernet Mapper with Quad Integrated T1/E1/J1 Transceivers
9.16 X.86 Encoding and Decoding
X.86 protocol provides a method for encapsulating Ethernet Frame onto LAPS. LAPS provides an 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 device 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
14-7. The X.86 transmitter provides a byte boundary indicator with the
signal TSYNC. The functional timing is shown in
Figure
14-6. Note that in some cases, additional logic may be
required to meet RSYNC/TSYNC sychronization timing requirements when operating in X.86 mode.
Figure 9-13. LAPS Encoding of MAC Frames Concept
IEEE
802.3 MAC Frame
LAPS
Rate Adaption
SDH
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