參數(shù)資料
型號: DS3112
廠商: DALLAS SEMICONDUCTOR
元件分類: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA256
封裝: 27 X 27 MM, PLASTIC, BGA-256
文件頁數(shù): 34/134頁
文件大?。?/td> 900K
代理商: DS3112
DS3112
129 of 134
C-Bit Parity Mode
Unlike the M23 application which uses the C bits for stuffing, the C-bit Parity Mode assumes that a stuff
bit should be placed at every opportunity and hence the C bits can be used for other purposes. See Table
14.2D for a list of how the C bits are redefined in the C-Bit Parity Mode.
C Bit Assignment for C-Bit Parity Mode Table 14.2D
M
Subframe
Number
C Bit
Number
Function
Description
11
2
3
Application ID
Reserved
Far End Alarm
and Control
(FEAC)
This bit (which is fixed to a value of 1) identifies the
T3 data stream as operating in C-Bit Parity Mode.
Must be set to one (1).
A serial communications channel that contains a
repeating 16-bit codeword that indicates the state of
the far-end and can control the near-end by invoking
loopbacks both on the T3 and T1 lines.
If no
codewords are being sent, the channel contains all
ones.
21
2
3
Unused
All unused bits are set to a one (1).
31
2
3
C-Bit Parity (CP)
All three CP bits are set to the same value as the two P
bits. If the three CP bits are not equal, a majority vote
is used to decode the true value.
41
2
3
FEBE
All three Far End Block Error (FEBE) bits shall be set
to one (111) if the local T3 framer did not incur an
error in either the M bits or F bits nor has it detected a
CP parity error. The FEBE bits are set to any value
except 111 when an error is detected in the M bits or F
bits or if a CP parity error is detected. During an LOF
event, these bits are set to 000.
51
2
3
Data Link
These three C bits make up a 28.2 kbps HDLC
(LAPD) maintenance data link over which three
76 octet messages are sent from the local end to the
remote end once a second.
61
2
3
Unused
Must be set to 1.
71
2
3
Unused
Must be set to 1.
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