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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: 35/106頁
文件大小: 428K
代理商: W6691
Preliminary W6691
Publication Release Date: Sep 2001
35 Revision 1.1
7.2.5 D Channel Access Control
The D channel access control includes collision detection and priority management. The collision detection
is always enabled. The priority management procedure as specified in ITU-T I.430 is fully implemented in
W6691.
A collision is detected if the transmitted D bit and the received echo bit do not match. When this occurs, D
channel transmission is immediately stopped, and the echo channel is monitored to attempt the next D
channel access.
There are two priority classes: class 1 and class 2. Within each class, there are normal and lower priority
levels.
TABLE 7.8 D PRIORITY CLASSES
Normal level
Lower level
Priority class 1
8
9
Priority class 2
10
11
The selection of priority class is via the AR8/AR10 command. The following table summarizes the
commands/indications used for setting the priority classes:
TABLE 7.9 D PRIORITY COMMANDS/INDICATIONS
Command
Symbol Code Remarks
Activate request, set priority 8
AR8
1000
Activation command, set D channel priority to 8
Activate request, set priority 10
AR10
1001
Activation command, set D channel priority to 10
Indication
Abbr.
Remarks
Activate indication with priority 8 AI8
1100
Info 4 received, D channel priority is 8 or 9
Activate indication with priority 10 AI10
1101
Info 4 received, D channel priority is 10 or 11
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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