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參數(shù)資料
| 型號： | DS3112+W |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 38/133頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MUX T3/E3 3.3V 256-PBGA |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準包裝： | 40 |
| 控制器類型： | 調(diào)幀器，多路復(fù)用器 |
| 接口： | 并行/串行 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 電流 - 電源： | 150mA |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 256-LBGA |
| 供應(yīng)商設(shè)備封裝： | 256-PBGA（27x27） |
| 包裝： | 管件 |
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DS3112
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14.12G.747 Framing Structure and E12 Multiplexing
The G.747 frame structure is made up of five 168-bit sets (Figure 14-9). The five sets are transmitted one
after another (...Set1/Set2/Set3/Set4/Set5/Set1...) to make up the complete G.747 frame structure. The
Frame Alignment Signal (FAS) is placed in the first 9 bits of Set 1. Set 2 contains the Remote Alarm
Indication (RAI) bit and a Parity Bit (PAR) as well as a reserved bit, which is fixed to a one. The PAR bit
will be set to a one when there are odd numbers of ones from the tributaries in the preceding frame and it
will be set to a zero when there is an even number of ones. The parity calculation does not include the
FAS, RAI, reserved bit, or Justification Control Bits. The three tributaries are bit interleaved starting with
a bit from Tributary 1 immediately after the FAS in Set 1. The first three bits of Sets 3, 4, and 5 are the
Justification Control Bits. Bits 4 to 6 of Set 5 are the Stuffing Bits. The Justification Control bits control
when data will be stuffed into the Stuffing Bit positions. When a majority of the three Justification
Control Bits from a particular tributary is set to zero, the Stuffing Bit position will be used for tributary
data. When the Justification Control Bits are majority decoded to be one, the Stuffing Bit will not be used
for tributary data.
Figure 14-9. G.747 Frame Structure
Set 1
Bit 1
Bit 168
FAS (111010000)
b11
b21
b31
b12
b22
b32
b13
...bits from the tributaries...
Set 2
Bit 1
Bit 168
RAI
PAR
1
...bits from the tributaries...
Set 3
Bit 1
Bit 168
c11
c21
c31
...bits from the tributaries...
Set 4
Bit 1
Bit 168
c12
c22
c32
...bits from the tributaries...
Set 5
Bit 1
Bit 168
c13
c23
c33
s1
s2
s3
...bits from the tributaries...
NOTE 1:
BIT 1 OF SET 1 IS TRANSMITTED FIRST.
NOTE 2:
BJI
TRIBUTARY BITS
J = TRIBUTARY NUMBER
I = BIT NUMBER
NOTE 3:
CJI
JUSTIFICATION CONTROL BITS
J = TRIBUTARY NUMBER
I = CONTROL STUFFING BIT NUMBER
NOTE 4:
SJ
STUFFING BITS
J = TRIBUTARY NUMBER
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