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參數(shù)資料
| 型號： | XRT73L00 |
| 廠商： | Exar Corporation |
| 英文描述： | E3/DS3/STS-1 LINE INTERFACE UNIT |
| 中文描述： | E3/DS3/STS-1線路接口單元 |
| 文件頁數(shù)： | 27/53頁 |
| 文件大小： | 604K |
| 代理商： | XRT73L00 |
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XRT73L00
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.2.0
24
The XRT73L00 Transmit Clock Duty Cycle Adjust cir-
cuit alleviates the need to supply a signal with a 50%
duty cycle to the TCLK input pin.
2.3
T
HE
HDB3/B3ZS E
NCODER
B
LOCK
The purpose of the HDB3/B3ZS Encoder Block is to
aid in the Clock Recovery process at the Remote Ter-
minal Equipment by ensuring an upper limit on the
number of consecutive zeros that can exist in the line
signal.
2.3.1
B3ZS Encoding
If the XRT73L00 is configured to operate in the DS3
or SONET STS-1 Modes, then the HDB3/B3ZS En-
coder block operates in the B3ZS Mode. When the
Encoder is operating in this mode, it parses through
and searches the Transmit Binary Data Stream from
the Transmit Logic Block for the occurrence of three
(3) consecutive zeros (“000”). If the B3ZS Encoder
finds an occurrence of three consecutive zeros, it
substitutes these three “0’s” with either a "00V" or a
"B0V" pattern.
“B” represents a Bipolar pulse that is compliant with
the Alternating Polarity requirements of the AMI (Al-
ternate Mark Inversion) line code and “V” represents
a bipolar Violation (e.g., a bipolar pulse that violates
the Alternating Polarity requirements of the AMI line
code).
The B3ZS Encoder decides whether to substitute
with either a "00V" or a "B0V" pattern to insure that
an odd number of bipolar pulses exist between any
two consecutive violation pulses.
Figure 13 illustrates the B3ZS Encoder at work with
two separate strings of three (or more) consecutive
zeros.
2.3.2
If the XRT73L00 is configured to operate in the E3
Mode, then the HDB3/B3ZS Encoder block operates
in the HDB3 Mode. When the Encoder is operating in
this mode, it parses through and searches the Trans-
mit Data Stream from the Transmit Logic Block for the
HDB3 Encoding
occurrence of four (4) consecutive zeros (“0000”). If
the HDB3 Encoder finds an occurrence of four con-
secutive zeros, then it substitutes these four “0’s” with
either a “000V” or a “B00V” pattern to insure that an
odd number of bipolar pulses exist between any two
consecutive violation pulses.
F
IGURE
13. A
N
E
XAMPLE
OF
B3ZS E
NCODING
Data
TPDATA
TNDATA
1 0 1 1 0 0 0 1 0 1 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 1
0 0 V
Line Signal
B 0 V
TCLK
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT73L00A | E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00AIV | E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT75L03DIV | Telecomm/Datacomm |
| XRT75L00 | E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
| XRT75L00IV | E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT73L00A | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00AES | 功能描述:界面開發(fā)工具 Eval System for XRT73L00A Series RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XRT73L00AIV | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00IV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LINE INTERFACE|QFP|44PIN|PLASTIC |
| XRT73L02M | 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
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