![](http://datasheet.mmic.net.cn/Exar-Corporation/XRT79L71IB-F_datasheet_100145/XRT79L71IB-F_20.png)
XRT79L71
PRELIMINARY
5
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
REV. P2.0.0
1.0
BRIEF XRT79L71 ARCHITECTURE DESCRIPTION
The XRT79L71 can be configured to operate in any of the following modes.
The Clear-Channel DS3/E3 Framer Mode
The High-Speed HDLC Controller over DS3/E3 Mode
The ATM UNI over DS3/E3 Mode
The PPP over DS3/E3 Mode
The detailed functional description of the XRT79L71, that covers these four modes of operation, can be found
in various documents as presented below in Table 2.
If the XRT79L71 is to be operated in a particular mode, obtain the appropriate document, which is presented in
However, a brief functional/architectural description of the XRT79L71, when it is configured to
operate in any of these modes will be presented below.
1.1
BRIEF FUNCTIONAL ARCHITECTURE DESCRIPTION OF THE XRT79L71 - CLEAR-CHANNEL
DS3/E3 FRAMER MODE
If the XRT79L71 has been configured to operate in the Clear-Channel DS3/E3 Framer Mode, then it will have
the Functional Architecture as is presented below in Figure 2.
TABLE 2: LISTING OF ARCHITECTURAL/FUNCTIONAL DESCRIPTION DOCUMENTS FOR THE XRT79L71
MODE OF OPERATION
ARCHITECTURAL/FUNCTIONAL DESCRIPTION DOCUMENT
DS3/E3 Clear-Channel Framer Mode
79L71_Arch_Descr_CC.pdf
Architectural/Functional Description of the XRT79L71, 1-Channel DS3/E3 ATM
UNI/PPP/Clear-Channel with LIU, IC - Clear-Channel Framer Applications
DS3/E3 High-Speed HDLC Controller
Mode
79L71_Arch_Descr_HDLC.pdf -
Architectural/Functional Description of the XRT79L71 1-Channel DS3/E3 ATM
UNI/PPP/Clear-Channel with LIU IC - High-Speed HDLC Controller Mode
Applications
DS3/E3 ATM UNI Mode
79L71_Arch_Descr_ATM.pdf
Architectural/Functional Description of the XRT79L71 1-Channel DS3/E3 ATM
UNI/PPP/Clear-Channel Framer with LIU IC - ATM UNI Mode Applications
DS3/E3 PPP Mode
79L71_Arch_Descr_PPP.pdf
Architectural/Functional Description of the XRT79L71 1-Channel DS3/E3 ATM
UNI/PPP/Clear-Channel Framer with LIU IC - PPP Mode Applications