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參數(shù)資料
| 型號： | MT8979 |
| 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)： | 10/30頁 |
| 文件大小： | 190K |
| 代理商： | MT8979 |
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MT8979
ISO-CMOS
4-96
The
dependent upon the state of frame alignment framer.
The multiframe framer will not initiate a search for
multiframe synchronization until frame sync is
achieved. Multiframe synchronization will be
declared on the first occurrence of four consecutive
zeros in the higher order quartet of channel 16.
Once multiframe synchronization is achieved, the
framer will only go out of synchronization after
detection of two errors in the multiframe signal or
loss of frame alignment synchronization.
multiframe
synchronization
algorithm
is
The
dependent on the state of the frame alignment
framer, but is independent of the multiframe
synchronization. The CRC framer will not initate a
search for CRC framing signal until frame alignment
synchronization is achieved. Once frame alignment
CRC
synchronization
algorithm
is
also
synchronization is acquired, the CRC framer must
find two framing signals in bit 1 of the non-frame
alignment signal. Upon detection of the second CRC
framing signal the MT8979 will immediately go into
CRC synchronization. When maintenance feature is
enabled (maint bit = 1) the CRC framer will force a
complete reframe of the device if CRC frame
synchronization is not found within 8 ms or more
than 914 CRC errors occur per second.
Figure 13 - Synchronization State Diagram
out of
synchronization
search for frame
alignment
signal
verify bit 2 of non-
frame alignment
signal
verify second
occurrence of frame
alignment signal
find two CRC
frame alignment
signals
CRC synchronization
acquired
search for
multiframe align-
ment signal
multiframe synchro-
nization acquired
check for two errored
multiframe alignment
signals
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
# of consecutive incorrect
frame alignment signals = 3
time out > 8ms
No
- - - - - Only if the
maintenance
option is
selected
No
number of CRC
errors > 914/s
frame synchroni-
zation acquired
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MT8980D | Digital Switch(數(shù)字開關(guān)（在微處理器控制下，轉(zhuǎn)換PCM編碼控制的話音或數(shù)據(jù)）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MT8979AP | 制造商:MITEL 功能描述: |
| MT8979AP1 | 制造商:Microsemi Corporation 功能描述:FRAMER CRC-4/PCM 30 5V 44PLCC - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC FRAMER/INTERFACE CEPT 44PLCC 制造商:Microsemi Corporation 功能描述:IC FRAMER/INTERFACE CEPT 44PLCC |
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