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)
文件頁數(shù)： 130/135頁
文件大小： 585K
代理商： DS3112RD
DS3112
130 of 135
C-Bit Parity Mode
Unlike the M23 application that 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
1
1
2
3
Far End Alarm
and Control
(FEAC)
the far-end and can control the near-end by invoking
loopbacks both on the T3 and T1 lines. If no code
words are being sent, the channel contains all ones.
2
1
2
3
Unused
3
1
2
3
C-Bit Parity (CP)
vote is used to decode the true value.
4
1
2
3
FEBE
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.
5
1
2
3
Data Link
76 octet messages are sent from the local end to the
remote end once a second.
6
1
2
3
Unused
Must be set to 1.
7
1
2
3
Unused
Must be set to 1.
C BIT
NUMBER
FUNCTION
DESCRIPTION
Application ID
Reserved
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 code word that indicates the state of
Unused
Unused
All unused bits are set to a one (1).
C-Bit Parity (CP)
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
FEBE
FEBE
All three Far End Block Error (FEBE) bits shall be
set to one (111) if the local T3 framer did not incur
Data Link
Data Link
These three C bits make up a 28.2kbps HDLC
(LAPD) maintenance data link over which three
Unused
Unused
Must be set to 1.
Must be set to 1.
Unused
Unused
Must be set to 1.
Must be set to 1.
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