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參數(shù)資料
| 型號： | PE-65966 |
| 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)： | 26/55頁 |
| 文件大小： | 608K |
| 代理商： | PE-65966 |
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XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
á
22
The XRT7300 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
Terminal 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 XRT7300 is configured to operate in the DS3 or
SONET STS-1 Modes, then the HDB3/B3ZS Encoder
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 substi-
tutes 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 in order to in-
sure that an odd number of bipolar pulses exist be-
tween 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 XRT7300 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
HDB3 Encoding
the 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 in order 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PE-65966NL | 功能描述:變壓器音頻和信號 TRANSFORMER DUAL RoHS:否 制造商:Skyworks Solutions, Inc. 頻率范圍:810 MHz to 960 MHz 初級線圈阻抗: 次級線圈阻抗: 絕緣電壓:23 dB 工作溫度范圍:- 40 C to + 85 C 端接類型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 產(chǎn)品:Splitters and Combiners |
| PE65967 | 制造商:Pulse Electronics Corporation 功能描述: |
| PE-65967 | 功能描述:變壓器音頻和信號 40uH 1:1 SMD RoHS:否 制造商:Skyworks Solutions, Inc. 頻率范圍:810 MHz to 960 MHz 初級線圈阻抗: 次級線圈阻抗: 絕緣電壓:23 dB 工作溫度范圍:- 40 C to + 85 C 端接類型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 產(chǎn)品:Splitters and Combiners |
| PE-65967NL | 功能描述:變壓器音頻和信號 TRANSFORMER DUAL RoHS:否 制造商:Skyworks Solutions, Inc. 頻率范圍:810 MHz to 960 MHz 初級線圈阻抗: 次級線圈阻抗: 絕緣電壓:23 dB 工作溫度范圍:- 40 C to + 85 C 端接類型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 產(chǎn)品:Splitters and Combiners |
| PE65967NLT | 制造商:Pulse Electronics Corporation 功能描述: |
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