參數(shù)資料
型號: XRT75R12DIB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
中文描述: DATACOM, PCM TRANSCEIVER, PBGA420
封裝: 35 X 35 MM, TBGA-420
文件頁數(shù): 98/131頁
文件大?。?/td> 717K
代理商: XRT75R12DIB
XRT75R12D
REV. P1.0.1
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
PRELIMINARY
93
Figure 43 was copied directly out of Telcordia GR-253-CORE. However, this figure can be simplified and
redrawn as depicted below in Figure 44.
F
IGURE
43. A
N
I
LLUSTRATION
OF
T
ELCORDIA
GR-253-CORE’
S
R
ECOMMENDATION
ON
HOW
MAP
DS3
DATA
INTO
AN
STS-1 SPE
F
IGURE
44. A S
IMPLIFIED
"B
IT
-O
RIENTED
" V
ERSION
OF
T
ELCORDIA
GR-253-CORE’
S
R
ECOMMENDATION
ON
HOW
TO
MAP
DS3
DATA
INTO
AN
STS-1 SPE
For DS3 Mapping, the STS-1 SPE has the following structure.
87 bytes
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
25I
I
C3
R
25I
I
C2
R
25I
C1
R
R
POH
R = [r, r, r, r, r, r, r, r]
I = [i, i, i, i, i, i, i, i]
C1 = [r, r, c, i, i, i, i, i]
C2 = [c, c, r, r, r, r, r, r]
C3 = [c, c, r, r, o, o, r, s]
i = DS3 data
r = fixed stuff bit
c = stuff control bit
s = stuff opportunity bit
o = overhead communications channel bit
Fixed
Stuff
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
208i
s
1r
2o
2r
2c
16r
208i
6r
2c
16r
205i
c
18r
r
c
s
i
o
- Fixed Stuff Bits
- Stuff Control/Indicator Bits
- DS3 Data Bits
- Stuff Opportunity Bits
- Overhead Communication Bits
POH
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