參數(shù)資料
型號: XRT83L314IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA304
封裝: TBGA-304
文件頁數(shù): 31/84頁
文件大?。?/td> 631K
代理商: XRT83L314IB
XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
27
N
OTE
:
VDD=3.3V ±5%, T
A
=25°C, Unless Otherwise Specified
3.2
HDB3/B8ZS Encoder
In single rail mode, the LIU can encode the TPOS input signal to AMI or HDB3/B8ZS data. In E1 mode and
HDB3 encoding selected, any sequence with four or more consecutive zeros in the input will be replaced with
000V or B00V, where "B" indicates a pulse conforming to the bipolar rule and "V" representing a pulse violating
the rule. An example of HDB3 encoding is shown in Table 8. In T1 mode and B8ZS encoding selected, an
input data sequence with eight or more consecutive zeros will be replaced using the B8ZS encoding rule. An
example with Bipolar with 8 Zero Substitution is shown in Table 9.
T
ABLE
7: T
IMING
S
PECIFICATIONS
FOR
TCLK/TPOS/TNEG
P
ARAMETER
S
YMBOL
M
IN
T
YP
M
AX
U
NITS
TCLK Duty Cycle
T
CDU
30
50
70
%
Transmit Data Setup Time
T
SU
50
-
-
ns
Transmit Data Hold Time
T
HO
30
-
-
ns
TCLK Rise Time (10% to 90%)
TCLK
R
-
-
40
ns
TCLK Fall Time (90% to 10%)
TCLK
F
-
-
40
ns
T
ABLE
8: E
XAMPLES
OF
HDB3 E
NCODING
N
UMBER
OF
P
ULSES
B
EFORE
N
EXT
4 Z
EROS
Input
0000
HDB3 (Case 1)
Odd
000V
HDB3 (Case 2)
Even
B00V
T
ABLE
9: E
XAMPLES
OF
B8ZS E
NCODING
C
ASE
1
P
RECEDING
P
ULSE
N
EXT
8 B
ITS
Input
+
00000000
B8ZS
000VB0VB
AMI Output
+
000+-0-+
Case 2
Input
-
00000000
B8ZS
000VB0VB
AMI Output
-
000-+0+-
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