參數(shù)資料
型號(hào)： DS3112RD
廠商： Maxim Integrated Products, Inc.
英文描述： RECT BRIDGE GPP 15A 800V GBJ
中文描述： DS3/E3多路復(fù)用器參考設(shè)計(jì)
文件頁(yè)數(shù)： 132/135頁(yè)
文件大?。?/td> 585K
代理商： DS3112RD
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DS3112
132 of 135
T3 STUFF BLOCK STRUCTURE
Figure 14.2D
M1
Subframe
Bit 1
Bit 2
M2
Subframe
Bit 1
Bit 2
M3
Subframe
Bit 1
Bit 2
M4
Subframe
Bit 1
Bit 2
M5
Subframe
Bit 1
Bit 2
M6
Subframe
Bit 1
Bit 2
M7
Subframe
Bit 1
Bit 2
14.3 E13 Basics
E13 multiplexing is a two-step process of merging 16 E1 lines into a single E3 line. First, four of the E1
lines are merged into a single E2 rate and then four E2 rates are merged to form the E3. The first step of
this process is called a E12 function since it is merging E1 lines into E2. The second step of this process
is called a E23 function since it is merging E2 lines into a E3. The term E13 implies that both E12 and
E23 are being performed to map 16 E1 lines into the E3. These two steps are independent and will be
discussed separately.
E Carrier Rates
Table 14.3A
E CARRIER LEVEL
NOMINAL DATA RATE (Mbps)
E1
2.048
E2
8.448
E3
34.368
E2 Framing Structure and E12 Multiplexing
The E2 frame structure is made up of four 212-bit sets (Figure 14.3A). The four sets are transmitted one
after another (...Set1/Set2/Set3/Set4/Set1...) to make up the complete E2 frame structure. The Frame
Alignment Signal (FAS) is placed in the first 10 bits of Set 1 and is followed by the Remote Alarm
Indication (RAI) bit and a National Bit (Sn). The remainder of Set 1 is filled with bits from the four
tributaries. The four tributaries are bit interleaved starting with a bit from Tributary 1 immediately after
the Sn bit. The first four bits of Sets 2, 3, and 4 are the Justification Control Bits. Bits 5 to 8 of Set 4 are
the Stuffing Bits. The Justification Control bits control when data will be stuffed into the Stuffing Bit
F4 Stuff
Info
Info
Bit 3
Info
Bit 4
Info
Bit 5
Info
Bit 6
Info
Bit 7
Info
Bit 8
......
Info
Bit 84
F4 Info
Stuff
Info
Bit 3
Info
Bit 4
Info
Bit 5
Info
Bit 6
Info
Bit 7
Info
Bit 8
......
Info
Bit 84
F4 Info
Info
Stuff
Bit 3
Info
Bit 4
Info
Bit 5
Info
Bit 6
Info
Bit 7
Info
Bit 8
......
Info
Bit 84
F4 Info
Info
Info
Bit 3
Stuff
Bit 4
Info
Bit 5
Info
Bit 6
Info
Bit 7
Info
Bit 8
......
Info
Bit 84
F4 Info
Info
Info
Bit 3
Info
Bit 4
Stuff
Bit 5
Info
Bit 6
Info
Bit 7
Info
Bit 8
......
Info
Bit 84
F4 Info
Info
Info
Bit 3
Info
Bit 4
Info
Bit 5
Stuff
Bit 6
Info
Bit 7
Info
Bit 8
......
Info
Bit 84
F4 Info
Info
Info
Bit 3
Info
Bit 4
Info
Bit 5
Info
Bit 6
Stuff
Bit 7
Info
Bit 8
......
Info
Bit 84
相關(guān)PDF資料
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