DS33X42DK Maxim Integrated Products, DS33X42DK Datasheet - Page 94
DS33X42DK
Manufacturer Part Number
DS33X42DK
Description
Power Management Modules & Development Tools Ethernet Over PDH Ma PDH Mapping Devices
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33X11.pdf
(375 pages)
Specifications of DS33X42DK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.20.4 X.86 Encoding and Decoding
X.86 protocol provides a method for encapsulating Ethernet Frame for eventual transport on a SONET or SDH
network. LAPS provides a byte-synchronous HDLC-like framing structure for encapsulation of Ethernet frames, but
is not as susceptible to dynamic bandwidth expansion as bit-stuffed HDLC. 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 Figure
11-13. The X.86 transmitter provides a byte boundary indicator with the signal TSYNC. The functional timing is
shown in Figure 11-9.
A Line Header Insertion function (in PP.ELHHR and PP.ELHLR) allows the user to insert Address, Control, and
SAPI bytes. The Tag 1 Insertion function (in PP.ET1DHR and PP.ET1DLR) allows the user to insert a 4-byte MPLS
tag immediately before the Destination Address (DA). The Tag 2 Insertion function (in PP.ET2DHR and
PP.ET2DLR) allows the user to insert a 4-byte VLAN tag immediately after the Source Address (SA). Any existing
VLAN tags are “pushed” lower in the frame.
Figure 8-20. LAPS / X.86 Encapsulated Frame Format
Rev: 063008
________________________________________________ DS33X162/X161/X82/X81/X42/X41/X11/W41/W11
Q-in-Q VLAN TAG (existing/optional)
MSB
Destination Address (DA)
2nd Octet of SAPI(0x01)
1st Octet of SAPI(0xFE)
Source Address (SA)
MPLS TAG (optional)
VLAN TAG (optional)
Length / EtherType
MAC Client Data
Address(0x04)
PAD (optional)
FCS for LAPS
Control(0x03)
FCS for MAC
Flag(0x7E)
Flag(0x7E)
LSB
Bytes
46-1500
1
1
1
6
6
1
1
4
4
4
2
4
4
1
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