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參數資料
| 型號： | W6691 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | ISDN S/T Interface Transceiver |
| 中文描述： | 綜合業務數字網的S / T接口收發器 |
| 文件頁數： | 38/106頁 |
| 文件大小： | 428K |
| 代理商： | W6691 |
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Preliminary W6691
Publication Release Date: Sep 2001
38 Revision 1.1
7.2.7Multiframe Synchronization
As specified by ITU-T I.430, the Q bit is transmitted from TE to NT in the position normally occupied by the
auxiliary framing bit (F
A
) in one frame out of 5, whereas the S bit is transmitted from NT to TE. The S and Q bit
positions and multiframe structure are shown in Table 7.10.
The functions provided by W6691 are:
- Multiframe synchronization: Synchronization is achived when the M bit pattern has been correctly received
during 20 consecutive frames starting from frame number 1.
Note: Criterion for multiframe synchronization is not defined in I.430 Recommendation.
- S bits receive and detect: When synchronization is achieved, the four received S bits in frames 1,6,11,16
are stored as S1 to S4 in the SQR register respectively. A change in the recived four bits (S1-4) is
indicated by an interrupt.
- Multiframe synchronization monitoring:
synchronization state is indicated by the MSYN bit in the SQR register.
Multiframe synchronization is constantly monitored. The
- Q bits transmit and F
A
mirroring: When multiframe synchronization is achived, the four bits Q1-4 stored in
the SQXR register are transmitted as the four Q bits (F
A
-bit position) in frames 1,6,11 and 16. Otherwise
the F
A
bit transmitted is a mirror of the received F
A
-bit. At loss of synchronization, the mirroring is resumed
at the next F
A
-bit.
- The multiframe synchronization can be disabled by setting MFD bit in the D_MODE register.
- According to I.430 Recommendation, the S/Q channel can be used as operation and maintenance
signalling channel. At transmitter, a S/Q code for a message shall be repeated at least six times or as
many as necessary to obtain the desired response. At receiver, a message shall be considered received
only when the proper codes is received three consecutive times.
相關PDF資料 |
PDF描述 |
|---|---|
| W6691CD | ISDN S/T Interface Transceiver |
| W6691CP | ISDN S/T Interface Transceiver |
| W6692 | PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器) |
| W6693A | USB Bus ISDN S/T Interface Controller(USB總線的ISDN S/T接口控制器) |
| W6694 | PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W66910 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| W66910CD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TE Mode ISDN S/T-Controller with Microprocessor Interface |
| W6691CD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:ISDN S/T Interface Transceiver |
| W6691CP | 制造商:WINBOND 制造商全稱:Winbond 功能描述:ISDN S/T Interface Transceiver |
| W6692 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:PCI Bus ISDN S/T-Controller |
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