參數(shù)資料
型號(hào): DS3160
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁(yè)數(shù): 106/107頁(yè)
文件大?。?/td> 592K
代理商: DS3160
DS3160
106 of 107
13. J2 FRAME FORMAT
The DS3160 supports the G.704 and NTT J2 frame format. Highlights of the J2 structure include the
following:
The J2 format is frame based.
Each frame contains 96 bytes of user data, two reserved bytes, and five overhead bits for a total of 789
bits.
The five overhead bits are designated as F-bits and are used for frame alignment, path CRC, and data
link.
The frame rate is 8000 per second or 125 s long.
789 bits per frame / 125 s per frame = 6.312Mbps line rate.
The frames are grouped into four formatted multiframes.
Figure 13A. J2 FRAME STRUCTURE
FRAME COMPONENT
DEFINITION
TS1 . . . TS96
Byte interleaved user data
TS97, TS98
Reserved channels for signaling
Frame Alignment Signal
110010100 (See Figure 13A for location.)
m
4kHz data link
x1, x2, x3
Spare bits, set to 1 if not used
a
Remote LOF alarm bit, (1 = alarm, 0 = no alarm)
e1 . . . e5
CRC-5 check sequence. Starts with bit number 1 of frame 1 and
ends at bit number 784 of frame 4 for a total of 3151 bits.
Bit #
Frame 1
Frame 2
Frame 3
Frame 4
1–8
9–16 17–24
TS1
TS1
TS1
TS1
TS2
TS2
TS2
TS2
TS3
TS3
TS3
TS3
753–
760
761–
768
769–
776
777–-
784
785
786
787
788
789
TS95
TS97 TS98
TS96
TS95
TS97 TS98
TS96
TS95
TS97 TS98
TS96
TS95
TS97 TS98
TS96
1
1
0
0
m
1
0
1
0
0
x1`
x2
x3
a
m
e1
e2
e3
e4
e5
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