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| 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)： | 129/135頁(yè) |
| 文件大?。?/td> | 585K |
| 代理商： | DS3112RD |
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DS3112
129 of 135
T3 Framing Structure
As with M12, to understand the M23 function requires an understanding of T3 framing. The T3 frame
structure is very similar to the T2 frame structure; however, it is made up of seven M subframes (Figure
14.2C). The seven M subframes are transmitted one after another (...M1/M2/M3/.../ M6/M7M1/M2...) to
make up the complete T3 M frame structure. Each M subframe is made up of eight blocks and each block
is made up of 85 bits. The first bit of each block is dedicated to overhead and the next 84 bits are the
information bits where the T2 data will be placed for transport. The definitions of the overhead bits are
shown in Table 14.2C and the placements of the overhead bits are shown in Figure 14.2C.
T3 OVERHEAD BIT ASSIGNMENTS
Table 14.2C
OVERHEAD
BIT
M Bits
(M1/M2/M3)
framing patterns, the M bits are fixed to a certain state (M1 = 0 / M2 = 1 / M3 = 0).
F Bits
(F1/F2/F3/F4)
patterns, the F bits are fixed to a certain state (F1 = 1 / F2 = 0 / F3 = 0 / F4 = 1).
C Bits
(C1/C2/C3)
three C bits within a subframe are set to 1, then stuffing has occurred in the stuff
block of that subframe. If all three C bits are set to zero, then no stuffing has
occurred. When the three C bits are not equal, a majority vote is used to determine
the true state.
In the C-Bit Parity application, the C bits are defined as shown in Table 14.2D.
P Bits
(P1/P2)
M, F, X, and C overhead bits). P1 and P2 are always the same value (if they are not
the same value, this implies a parity error).
X Bits
(X1/X2)
X2 = 0) when the T3 framer cannot synchronize or detects AIS. It will be set to a
one (X1 = X2 = 1) otherwise. The value of the X bits should not change more than
once per second. X1 and X2 are always the same value.
M23 Multiplexing
The M23 function multiplexes seven T2 data streams into a single T3 data stream. The seven T2 data
streams are bit interleaved into the T3 framing structure. A bit from T2 line #1 is placed immediately
after the overhead bit in the information bit field, followed by a bit from T2 line #2, and so on. Since
there are 84 information bits in each block, there are 12 bits from each T2 line in a block.
The seven T2 lines are mapped asynchronously into the T3 data stream. This implies that there is no T2
framing information passed to the T3 level. The seven T2 lines can have independent timing sources and
they do not need to be timing locked to the T3 clock. To account for differences in timing, bit stuffing is
used. The last block of each M subframe is the stuff block (Figure 14.2C). In each stuff block there is an
associated stuff bit (Figure 14.2D) that will be either an information bit (if the three C bits are decoded to
be zero) or a stuff bit (if the three C bits are decoded to be a one). As shown in Figure 14.2D, the position
of the stuff bit varies depending on the M subframe. This is done to allow a stuffing opportunity to occur
on each T2 line in every T3 frame. For example, if the C bits in M Subframe 5 were all set to one, then
the fifth bit after the F4 overhead bit in the last block would be a stuff bit instead of an information bit.
DESCRIPTION
The M bits provide the frame alignment pattern for the seven M subframes. Like all
The F bits provide the frame alignment pattern for the M frame. Like all framing
In the M23 application, the C bits are used to indicate when stuffing occurs. If all
The P bits provide parity information for the preceding M frame (not including the
The X bit is used as a Remote Alarm Indication (RAI). It will be set to a zero (X1 =
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