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參數(shù)資料
| 型號： | CN8332EXF |
| 英文描述： | PCM Transceiver |
| 中文描述： | 收發(fā)器的PCM |
| 文件頁數(shù)： | 21/48頁 |
| 文件大?。?/td> | 434K |
| 代理商： | CN8332EXF |
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CN8331/CN8332/CN8333
2.0 Functional Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
2.2 Transmitter
100604B
Conexant
2-3
2.2 Transmitter
This section describes the detailed operation of the various blocks in the CN833x
transmitter.
2.2.1 AMI B3ZS/HDB3 Encoder
ENDECDIS and the E3MODE pins configure the encoder mode.
When ENDECDIS = 0, the encoder is receiving non-encoded Nonreturn to
Zero (NRZ) data on the TNRZ (TPOS) pin alone, and the NC (no connect)
(TNEG) pin is ignored.
Data is encoded into a representation of a three-level B3ZS (E3MODE = 0) or
HDB3 (E3MODE = 1) signal (conforming to the coding rules as specified in
Appendix A
) before going on to the pulse shaper in the form of two binary signals
representing the positive and negative three-level pulses.
When ENDECDIS = 1, the encoder is disabled. The encoder passes
already-encoded data over TPOS (TNRZ) and TNEG (NC) to the pulse shaper.
The transmit digital data is clocked into the chip via a rising TCLK edge,
which must be equal to the symbol rate (line rate). A small delay added to the data
provides a certain amount of negative data hold time.
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