參數(shù)資料
型號: XRT7302
廠商: Exar Corporation
英文描述: 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
中文描述: 2頻道E3/DS3/STS-1線路接口單元(2通道E3/DS3/STS-1線接口單元)
文件頁數(shù): 32/62頁
文件大?。?/td> 715K
代理商: XRT7302
XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. 1.1.6
28
2.3.2
HDB3 Encoding
If the XRT7302 has been configured to operate in the
E3 Mode, the HDB3/B3ZS Encoder blocks operate 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
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. The HDB3 En-
coder decides whether to substitute with either the
"000V" or the "B00V" pattern in order to insure that an
odd number of Bipolar pulses exist between any two
consecutive violation pulses.
Figure 11 illustrates the HDB3 Encoder at work with
two separate strings of four or more consecutive ze-
ros.
2.3.3
Disabling the HDB3/B3ZS Encoder
The XRT7302 HDB3/B3ZS Encoder can be disabled
by two methods.
a. Operating in the Hardware Mode.
The HBD3/B3ZS Encoder blocks of all channels
are disabled by setting the ENDECDIS (Encoder/
Decoder Disable) input pin to “0".
N
OTE
:
By executing this step the HDB3/B3ZS Encoder and
Decoder blocks in all channels of the XRT7302 are globally
disabled.
b. Operating in the HOST Mode.
When the XRT7302 is operating in the HOST Mode
the HDB3/B3ZS Encoders in each channel can be
individually enabled or disabled. Disable the
HDB3/B3ZS Encoder block in Channel(n) by setting
F
IGURE
10. A
N
E
XAMPLE
OF
B3ZS E
NCODING
1
1
1
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
B
0
V
0
0
V
Line Signal
TxClk
TNData
TPData
Data
F
IGURE
11. A
N
E
XAMPLE
OF
HDB3 E
NCODING
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
1
0
0
0
0
0
0
0
B
0
V
0
0
V
Line Signal
TxClk
TNData
TPData
Data
0
0
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