MT9072AV ZARLINK [Zarlink Semiconductor Inc], MT9072AV Datasheet - Page 46
MT9072AV
Manufacturer Part Number
MT9072AV
Description
Octal T1/E1/J1 Framer
Manufacturer
ZARLINK [Zarlink Semiconductor Inc]
Datasheet
1.MT9072AV.pdf
(275 pages)
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5.1.1
For D4 links the S-bit position contains an alternating 101010... pattern inserted into every second S-bit. These bits
are intended for determination of frame boundaries, and they are referred to as Ft bits. A separate fixed pattern,
repeating every superframe, is interleaved with the Ft bits. This fixed pattern (001110) is used to delineate the 12
frame superframe. These bits are referred to as the Fs bits. In D4 frames # 6 and #12, the LSB of each channel
byte may be replaced with A bit (frame #6) and B bit (frame #12) signaling information. See Table 8.
5.1.2
For ESF links the 6 bit framing pattern 001011, inserted into every 4th S-bit position, is used to delineate both frame
and superframe boundaries. Frames #6, 12, 18 and 24 may contain the A, B, C and D signaling bits, respectively. A
4 kHz data link is embedded in the S-bit position, interleaved between the framing pattern sequence (FPS) and the
transmit CRC-6 remainder (from the calculation done on the previous superframe). See Table 9.
T1 D4 Framing
T1 ESF Framing
Frame #
Frame #
1
2
3
4
5
6
7
10
12
11
1
2
3
4
5
6
7
8
9
FPS
0
Table 9 - ESF Superframe Structure (T1)
Table 8 - D4 Superframe Structure (T1)
Ft
1
0
1
0
1
0
Zarlink Semiconductor Inc.
FDL
MT9072
X
X
X
X
46
Fs
0
0
1
1
1
0
CRC
CB1
CB2
Signaling
A
B
Signaling
A
Data Sheet
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