參數(shù)資料
型號(hào)： XRT7300IV
廠商： EXAR CORP
元件分類(lèi)： 數(shù)字傳輸電路
英文描述： E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁(yè)數(shù)： 33/55頁(yè)
文件大?。?/td> 608K
代理商： XRT7300IV
á
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
29
ted over the E3, DS3 or STS-1 line) to its original con-
tent prior to Zero Suppression encoding.
3.5.1
B3ZS Decoding DS3/STS-1 Applications
If the XRT7300 is configured to operate in the DS3 or
STS-1 Modes, then the HDB3/B3ZS Decoding Block
performs B3ZS Decoding. When the Decoder is op-
erating in this mode it parses through the incoming
Dual-Rail data and checks for the occurrence of ei-
ther a “00V” or a “B0V” pattern. If the B3ZS Decoder
detects this particular pattern it substitutes these bits
with a “000” pattern.
N
OTE
:
If the B3ZS Decoder detects any bipolar violations
that is not in accordance with the”B3ZS Line Code” format,
or if the B3ZS Decoder detects a string of 3 (or more) con-
secutive “0’s” in the incoming line signal, then the B3ZS
Decoder flags this event as a Line Code Violation by puls-
ing the LCV output pin “High”.
Figure 19 illustrates the B3ZS Decoder at work with
two separate Zero Suppression patterns in the in-
coming Dual-Rail Data Stream.
3.5.2
If the XRT7300 is configured to operate in the E3
Mode, the HDB3/B3ZS Decoding Block performs
HDB3 Decoding. When the Decoder is operating in
this mode it parses through the incoming Dual-Rail
data and checks for the occurrence of either a “000V”
HDB3 Decoding E3 Applications
or a “B00V” pattern. If the HDB3 Decoder detects
this particular pattern, it substitutes these bits with a
“0000” pattern.
Figure 20 illustrates the HDB3 Decoder at work with
two separate Zero Suppression patterns in the in-
coming Dual-Rail Data Stream.
N
OTE
:
If the HDB3 Decoder detects any bipolar violation
(e.g., “V”) pulses that is not in accordance with the HDB3
Line Code format, or if the HDB3 Decoder detects a string
of 4 (or more) “0’s” in the incoming line signal, then the
HDB3 Decoder flags this event as a Line Code Violation by
pulsing the LCV output pin “High”.
F
IGURE
19. A
N
E
XAMPLE
OF
B3ZS D
ECODING
Data
0 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
RPOS
RNEG
0 0 V
Line Signal
B 0 V
RCLK
F
IGURE
20. A
N
E
XAMPLE
OF
HDB3 D
ECODING
Data
0 1 0 1 1 0 0 0 0 0 1 1 1 1 0 1 1 0 1 1 0 0 1 1 0 0 0 0 1
0 0 0 V
Line Signal
B 0 0 V
RPOS
RNEG
RCLK
相關(guān)PDF資料
PDF描述
XRT7300 E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
XRT73L02M TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
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XRT73L00 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT
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