DS33X42DK Maxim Integrated Products, DS33X42DK Datasheet - Page 98
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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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8.20.6 cHDLC Encoding And Decoding
The cHDLC protocol provides a simple method for encapsulating Ethernet Frames over point-to-point serial links.
A Line Header Insertion function (in PP.ELHHR and PP.ELHLR) allows the user to insert Address, Control, and
Protocol 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 8-22. cHDLC 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 Protocol
Source Address (SA)
MPLS TAG (optional)
1st Octet of Protocol
VLAN TAG (optional)
Length / EtherType
MAC Client Data
Address (0x0F)
PAD (optional)
FCS (optional)
Control (0x00)
FCS for MAC
Flag(0x7E)
Flag(0x7E)
LSB
Bytes
46-1500
1
1
1
6
6
1
1
4
4
4
2
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