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參數(shù)資料
| 型號： | MT8977AP |
| 廠商： | Mitel Networks Corporation |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 中文描述： | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大?。?/td> | 344K |
| 代理商： | MT8977AP |
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Preliminary Information
ISO-CMOS
MT8977
4-113
Figure 9 - Off-Line Framer State Diagram
Hunt Mode
False Candidate
False
Candidate
Forced
Reframe
Out of
Sync.
False
Candidate
Candidate
Candidate
CRC
Check
In sync
Candidate
*
Candidate
Valid Candidate
Resync
Receiver
Valid Candidate
New Frame Position
* Note: Only when in ESF mode and CRC
option is enabled.
Maintenance
Verify
discovered. It is, therefore, possible that the device
may not synchronize at all in the presence of PCM
code sequences (e.g., sequences generated by
some types of test signals), which contain mimics of
the terminal framing pattern.
Setting CRC/MIMIC bit high will force the framer to
synchronize to the first terminal framing pattern
detected. In standard D3/D4 applications, the user’s
system software should monitor the multiframe
synchronization state indicated by bit 3 in Master
Status Word 1. Failure of the device to achieve
multiframe synchronization within 4.5ms of terminal
frame synchronization, is an indication that the
device has framed up to a terminal framing pattern
mimic and should be forced to reframe.
One of the main features of the framer is that it
performs its function "off line". That is, the framer
repositions the receive circuit only when it has
detected a valid frame position. When the framer
exits maintenance mode the receive counters remain
where they are until the framer has found a new
frame position. This means that if the user forces a
reframe when the device was really in the right
place, there will not be any disturbance in the circuit
because the framer has no effect on the receiver
until it has found synchronization.
The out of
synchronization criterion can be controlled by bit 0 in
Master Control Word 2. This bit changes the out of
frame conditions for the maintenance state.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8979 | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT8979 | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT8979AE | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT8979AP | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT8979AC | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8977APR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: 制造商:ZARLINK 功能描述: |
| MT8979 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY CEPT PCM 30/CRC-4 Framer & Interface |
| MT8979AC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY CEPT PCM 30/CRC-4 Framer & Interface |
| MT8979AE | 制造商:Microsemi Corporation 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: |
| MT8979AE1 | 制造商:Microsemi Corporation 功能描述:FRAMER CRC-4/PCM 30 5V 28PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER CRC-4/PCM 30 5V 28PDIP - Rail/Tube |
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