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參數資料
| 型號： | DS3172N |
| 英文描述： | Single/Dual/Triple/Quad DS3/E3 Single-Chip Transceivers |
| 中文描述： | 單/雙/三/四DS3/E3單芯片收發(fā)器 |
| 文件頁數： | 87/232頁 |
| 文件大小： | 2133K |
| 代理商： | DS3172N |
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DS3171/DS3172/DS3173/DS3174
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The subframe alignment bits (F
X1
, F
X2
, F
X3
, and F
X4
) are overwritten with the values one, zero, zero, and one (1001)
respectively.
The X-bits (X
1
and X
2
) are both overwritten with the Remote Defect Indicator (RDI). The RDI source is
programmable (automatic, 1, or 0). If the RDI is generated automatically, the X-bits are set to zero when one or
more of the indicated alarm conditions is present, and set to one when all of the indicated alarm conditions are
absent. Automatically setting RDI on LOS, SEF, LOF, or AIS is individually programmable (on or off).
The P-bits (P
1
and P
2
) are both overwritten with the calculated payload parity from the previous DS3 frame. The
payload parity is calculated by performing modulo 2 addition of all of the payload bits after all frame processing has
been completed. P-bit generation is programmable (on or off). The P-bits will be generated if either P-bit generation
is enabled or frame generation is enabled.
If C-bit generation is enabled, the bit C
11
is overwritten with an alternating one zero pattern, and all of the other C-
bits (C
XY
) are overwritten with zeros. If C-bit generation is disabled, then all of the C-bit timeslots (C
XY
) will be
treated as payload data, and passed through. C-bit generation is programmable (on or off). Note: Overhead
insertion may still overwrite the C-bit time slots even if C-bit generation is disabled.
Once all of the DS3 overhead bits have been overwritten, the data stream is passed on to error insertion. If frame
generation is disabled, the incoming DS3 signal is passed on directly to error insertion. Frame generation is
programmable (on or off). Note: P-bit generation may still be performed even if frame generation is disabled.
10.6.6.3 Transmit M23 DS3 Error Insertion
Error insertion inserts various types of errors into the different DS3 overhead bits. The types of errors that can be
inserted are framing errors and P-bit parity errors.
The framing error insertion mode is programmable (F-bit, M-bit, SEF, or OOMF). An F-bit error is a single subframe
alignment bit (F
XY
) error. An M-bit error is a single multiframe alignment bit (M
1
, M
2
, or M
3
) error. An SEF error is an
error in all the subframe alignment bits in a subframe (F
X1
, F
X2
, F
X3
, and F
X4
). An OOMF error is a single multiframe
alignment bit (M
1
, M
2
, or M
3
) error in each of two consecutive DS3 frames.
A P-bit parity error is generated by is inverting the value of the P-bits (P
1
and P
2
) in a single DS3 frame. P-bit parity
error(s) can be inserted one error at a time, or continuously. The P-bit parity error insertion mode (single or
continuous) is programmable.
Each error type (framing or P-bit parity) has a separate enable. Continuous error insertion mode inserts errors at
every opportunity. Single error insertion mode inserts an error at the next opportunity when requested. The framing
multi-error insertion modes (SEF or OOMF) insert the indicated number of error(s) at the next opportunities when
requested; i.e., a single request will cause multiple errors to be inserts. The requests can be initiated by a register
bit(TSEI) or by the manual error insertion input (TMEI). The error insertion request source (register or input) is
programmable. The insertion of each particular error type is individually enabled. Once all error insertion has been
performed, the data stream is passed on to overhead insertion.
10.6.6.4 Transmit M23 DS3 Overhead Insertion
Overhead insertion can insert any (or all) of the DS3 overhead bits into the DS3 frame. The DS3 overhead bits X
1
,
X
2
, P
1
, P
2
, M
X
, F
XY
, and C
XY
can be sourced from the transmit overhead interface (TOHCLK, TOH, TOHEN, and
TOHSOF). The P-bits (P
1
and P
2
) are received as an error mask (modulo 2 addition of the input bit and the
internally generated bit). The DS3 overhead insertion is fully controlled by the transmit overhead interface. If the
transmit overhead data enable signal (TOHEN) is driven high, then the bit on the transmit overhead signal (TOH) is
inserted into the output data stream. Insertion of bits using the TOH signal overwrites internal overhead insertion.
10.6.6.5 Transmit M23 DS3 AIS/Idle Generation
M23 DS3 AIS/Idle generation overwrites the data stream with AIS or an Idle signal. If transmit Idle is enabled, the
data stream payload is forced to a 1100 pattern with two ones immediately following each DS3 overhead bit. M
1
,
M
2
, and M
3
bits are overwritten with the values zero, one, and zero (010) respectively. F
X1
, F
X2
, F
X3
, and F
X4
bits are
overwritten with the values one, zero, zero, and one (1001) respectively. X
1
and X
2
are overwritten with 11. P
1
and
P
2
are overwritten with the calculated payload parity from the previous output DS3 frame. And, C
31
, C
32
, and C
33
are overwritten with 000.
相關PDF資料 |
PDF描述 |
|---|---|
| DS3173 | Single/Dual/Triple/Quad DS3/E3 Single-Chip Transceivers |
| DS3173N | Single/Dual/Triple/Quad DS3/E3 Single-Chip Transceivers |
| DS3174 | Single/Dual/Triple/Quad DS3/E3 Single-Chip Transceivers |
| DS3174N | Single/Dual/Triple/Quad DS3/E3 Single-Chip Transceivers |
| DS318PIN | Industrial Control IC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS3172N+ | 功能描述:網絡控制器與處理器 IC Dual DS3/E3 Single Chip Transceiver RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3173 | 功能描述:網絡控制器與處理器 IC Triple DS3/E3 Single Chip Transceiver RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3173N | 功能描述:網絡控制器與處理器 IC Triple DS3/E3 Single Chip Transceiver RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3174 | 功能描述:網絡控制器與處理器 IC Quad DS3/E3 Single Chip Transceiver RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3174+ | 功能描述:網絡控制器與處理器 IC Quad DS3/E3 Single Chip Transceiver RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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